Relevant bibliographies by topics / And Vortex core line

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'And Vortex core line'

Author: Grafiati
Published: 4 June 2025
Last updated: 23 June 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'And Vortex core line.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "And Vortex core line"

1

Bhagwat, Mahendra J., and J. Gordon Leishman. "Self-Induced Velocity of a Vortex Ring Using Straight-Line Segmentation." Journal of the American Helicopter Society 59, no. 1 (2014): 1–7. http://dx.doi.org/10.4050/jahs.59.012004.

Full text
Abstract:
The accuracy of discretized induced velocity calculations that can be obtained using straight-line vortex elements has been reexamined, primarily using the velocity field induced by a vortex ring as a reference. The induced velocity of a potential (inviscid) vortex ring is singular at the vortex ring itself. Analytical results were found by using a small azimuthal cutoff in the Biot–Savart integral over the vortex ring and showed that the singularity is logarithmic in the cutoff. Discrete numerical calculations showed the same behavior, with the self-induced velocity exhibiting a logarithmic singularity with respect to the discretization, which introduces an inherent cutoff in the Biot–Savart integral. Core regularization or desingularization can also eliminate the singularity by using an assumed “viscous” core model. Analytical approximations to the self-induced velocity of a thin-cored vortex ring have shown that the self-induced velocity has a logarithmic singularity in the core radius. It is further shown that the numerical calculations require special treatment of the self-induced velocity caused by curvature, which is lost by the inherent cutoff in the straight-line discretization, to correctly recover this logarithmic singularity in the core radius. Numerical solution using straight-line vortex segmentation, augmented with curved vortex elements only for the self-induced velocity calculation, is shown to be second-order accurate in the discretization.
APA, Harvard, Vancouver, ISO, and other styles
2

Wang, Jun Qing, Pu Wang, and Jing Chang. "Vortex Tracking Algorithm and Visualization Based on Feature Flow Fields." Applied Mechanics and Materials 446-447 (November 2013): 1052–56. http://dx.doi.org/10.4028/www.scientific.net/amm.446-447.1052.

Full text
Abstract:
In the search for a new method of feature tracking of vector field, Theisel and Seidel proposed the concept of feature flow field [, In their paper, a flat time-varying flow field and multi-vortex structure, vortex will automatically extract and track based on the concept of feature flow field. The method used for tracking the vortex core flow line integral, by extracting the vortex areas of flow field to determine the vortex core range, precision tracking vortex core in the three-dimensional feature flow field and recording the specific path of evolution in the integrand flow line. The new algorithm using the flow line can describe the dynamic behavior of characteristics of vector field. The evolution of the flow field is more intuitive to observe the evolution of different periods, which laid the basis for visualization.
APA, Harvard, Vancouver, ISO, and other styles
3

SATO, Mie, and Ronald PEIKERT. "Core-Line-Based Vortex Hulls in Turbomachinery Flows." Journal of the Visualization Society of Japan 23, Supplement2 (2003): 151–54. http://dx.doi.org/10.3154/jvs.23.supplement2_151.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Boust, Fabrice, and Nicolas Vukadinovic. "Magnetic excitations in assemblies of dipolar coupled nanoparticles." EPJ Web of Conferences 244 (2020): 01015. http://dx.doi.org/10.1051/epjconf/202024401015.

Full text
Abstract:
The equilibrium magnetization configurations and the associated microwave susceptibility spectra of dipolar coupled nanoplatelets are explored using three-dimensional (3D) micromagnetic simulations. First, the case of periodic arrangements of nanoplatelets on square arrays is considered. As a result, a macro-vortex state defined as a flux closure pattern spreading over the whole array with or without a vortex core can be stabilized starting from an initial orthoradial magnetization configuration. For macro-vortex states with a vortex core, the linear excitation spectrum exhibits a sub-GHz resonance line ascribed to the vortex core dynamics at the array center. The features of this line (spectral position and amplitude) depend on the array size and the strength of the dipolar coupling through the interplatelet spacing. This resonance is also observed for macro-vortex states without a vortex core but only in the regime of a strong dipolar coupling. The effect of disorder is then investigated by numerically generating assemblies of nanoplatelets with a position disorder and, shape and size distributions. The micromagnetic simulations reveal flux closure magnetization configurations as well but without a vortex core. A low-frequency resonance appears in the susceptibility spectra for quite high surface contents of nanoplatelets but its amplitude is weaker compared to the case of periodic arrays. This line arises from a collective mode extended over a few nanoplatelets. A large variety of static and dynamical behaviors is thus evidenced resulting in a great complexity even in such model systems.
APA, Harvard, Vancouver, ISO, and other styles
5

MORGADO, W. A. M., M. M. DORIA, G. CARNEIRO, and I. G. DE OLIVEIRA. "VORTEX-LINE PHASE DIAGRAM FOR ANISOTROPIC SUPERCONDUCTORS." International Journal of Modern Physics B 16, no. 09 (2002): 1307–26. http://dx.doi.org/10.1142/s0217979202010282.

Full text
Abstract:
The zero-temperature vortex phase diagram for uniaxial anisotropic superconductors placed in an external magnetic field tilted with respect to the axis of anisotropy is studied for parameters typical of BSCCO and YBCO. The exact Gibbs free energy in the London approximation, using a self-energy expression with an anisotropic core cut-off, is minimized numerically, assuming only that the equilibrium vortex state is a vortex-line-lattice with a single vortex line per primitive unit cell. The numerical method is based on simulated annealing and uses a fast convergent series to calculate the energy of interaction between vortex lines. A phase diagram with three distinct phases is reported and the phases are characterized in detail. New results for values of the applied field close to the lower critical field are reported.
APA, Harvard, Vancouver, ISO, and other styles
6

Zhao, Hang, Wenxuan She, Qi Gao, and Xueming Shao. "Experimental Study On Pressure-Velocity Relation Of Near-Field Tip Vortex Using Tomographic PIV." Proceedings of the International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics 21 (July 8, 2024): 1–7. http://dx.doi.org/10.55037/lxlaser.21st.140.

Full text
Abstract:
The non-cavitating tip vortex in the near field of an elliptical hydrofoil is studied using tomographic particle image velocimetry (TPIV). By investigating the distributions of the axial velocity difference and streamwise vorticity, the formation and development of the near-field tip vortex are clearly revealed. In the near field, the axial flow within the tip vortex manifests a jet-like profile, and the majority of the vorticity is contained within the vortex core. A special position is identified during the streamwise evolution of the tip vortex, where the vortex core circulation reaches its local maximum for the first time and tip vortex cavitation (TVC) might be more prone to incept. In the vicinity of this crucial position, a concise relation between the static pressure along the tip vortex center line and the local velocity is derived by combining the three-dimensional measured velocity fields with the governing equations. Based on the Reynolds-averaged Navier-Stokes equation, it is revealed that the mean static pressure along the vortex center line is directly related to the local mean axial velocity, whereas the local velocity fluctuation has little impact on the mean static pressure. It is the first attempt to combine the three-dimensional measurement with the governing equations to investigate the near-field tip vortex flow, which might provide valuable insights for understanding and predicting tip vortex cavitation inception.
APA, Harvard, Vancouver, ISO, and other styles
7

WILLERT, CHRISTIAN E., and MORTEZA GHARIB. "The interaction of spatially modulated vortex pairs with free surfaces." Journal of Fluid Mechanics 345 (August 25, 1997): 227–50. http://dx.doi.org/10.1017/s0022112097006265.

Full text
Abstract:
Spatially modulated vortex pairs were generated below a free surface by two counter-rotating flaps whose edges approximate a sinusoid. The surface interactions of the vertically approaching vortex pairs were visualized by the shadowgraph technique. Two limiting cases were investigated in detail: the interaction with a surfactant-rich (contaminated) surface and with a surfactant-poor (‘clean’) surface. In the latter case shadowgraph images showed that the underlying vortex core formed a line of circular surface depressions. Subsequent measurements of the temporally evolving velocity fields using digital particle image velocimetry (DPIV) of the vortex pair cross-sections and the subsurface plane confirmed the connection process of the main vortex core with the surface. As a result of the connection the initially modulated vortex tube was broken into a line of U-vortices. In the presence of surfactants this connection could not be observed; rather a Reynolds ridge (or stagnation line) was formed and a very weak connection of the secondary separation vortex could be seen in the shadowgraphs as well as measured with the time-resolved DPIV technique.A prerequisite for connection of the vortex with the surface is that the flow's kinematics force the vortex core, that is, regions of concentrated vorticity, toward the surface. The ensuing locally concentrated viscous flux of surface-parallel vorticity through the surface is balanced by a local surface deceleration. Surface-normal vorticity appears on each side of the decelerated region whose gradually increasing circulation is directly balanced by the loss of circulation of the surface-parallel vortex. However, the shear forces caused by small amounts of surface contamination and its associated subsurface boundary layer inhibit the connection process by preventing the essential viscous flux of parallel vorticity through the surface. Instead, the subsurface boundary layer is associated with a flux of parallel vorticity into the surface which then concentrates into the observable secondary separation vortex.
APA, Harvard, Vancouver, ISO, and other styles
8

Meyer Forsting, Alexander R., Georg Raimund Pirrung, and Néstor Ramos-García. "A vortex-based tip/smearing correction for the actuator line." Wind Energy Science 4, no. 2 (2019): 369–83. http://dx.doi.org/10.5194/wes-4-369-2019.

Full text
Abstract:
Abstract. The actuator line (AL) was intended as a lifting line (LL) technique for computational fluid dynamics (CFD) applications. In this paper we prove – theoretically and practically – that smearing the forces of the actuator line in the flow domain forms a viscous core in the bound and shed vorticity of the line. By combining a near-wake representation of the trailed vorticity with a viscous vortex core model, the missing induction from the smeared velocity is recovered. This novel dynamic smearing correction is verified for basic wing test cases and rotor simulations of a multimegawatt turbine. The latter cover the entire operational wind speed range as well as yaw, strong turbulence and pitch step cases. The correction is validated with lifting line simulations with and without viscous core, which are representative of an actuator line without and with smearing correction, respectively. The dynamic smearing correction makes the actuator line effectively act as a lifting line, as it was originally intended.
APA, Harvard, Vancouver, ISO, and other styles
9

Lee, Hanseong, and Spyros A. Kinnas. "Unsteady Wake Alignment for Propellers in Nonaxisymmetric Flows." Journal of Ship Research 49, no. 03 (2005): 176–90. http://dx.doi.org/10.5957/jsr.2005.49.3.176.

Full text
Abstract:
A low-order boundary element method is applied to predict the trailing wake geometries shedding from hydrofoil and marine propellers in steady and unsteady flows, as well as the vortex motions of the classical lifting line problem with elliptic loading distribution. In order to prevent the numerical instability near the vortex roll-up region, a tip vortex with finite core size is introduced at the end of the vortex line (or at the tip of the wake sheet in the case of a three-dimensional problem), and the induced velocities are evaluated at the displaced control points instead of the actual control points on the vortex (or wake) panels. Green's integral equation with boundary conditions is formulated based on the perturbation potential and solved for the potentials on the lifting bodies and the tip vortex surface. The three-component velocities on the tip vortex surface are computed by numerically differentiating the solution potentials, and the induced velocities on the wake surface are directly determined from the integral equation derived from analytical differentiation of Green's integral equation. The new geometries of the vortex line or the trailing wake as well as the location of the tip vortex core center are then determined by aligning them to the flow so that the force-free condition is satisfied on the wake. The method is applied for the two-dimensional and three-dimensional problems, and validated with experiments and other numerical methods in terms of tip vortex trajectory and blade forces.
APA, Harvard, Vancouver, ISO, and other styles
10

CHOI, JAEHYUG, and STEVEN L. CECCIO. "Dynamics and noise emission of vortex cavitation bubbles." Journal of Fluid Mechanics 575 (March 2007): 1–26. http://dx.doi.org/10.1017/s0022112006003776.

Full text
Abstract:
The growth and collapse of a cavitation bubble forming within the core of a line vortex was examined experimentally to determine how the dynamics and noise emission of the elongated cavitation bubble is influenced by the underlying non-cavitating vortex properties. A steady line vortex was formed downstream of a hydrofoil mounted in the test section of a recirculating water channel. A focused pulse of laser light was used to initiate a nucleus in the core of a vortex, allowing for the detailed examination of the growth, splitting and collapse of individual cavitation bubbles as they experience a reduction and recovery of the local static pressure. Images of single-bubble dynamics were captured with two pulse-synchronized high-speed video cameras. The shape and dynamics of single vortex cavitation bubbles are compared to the original vortex properties and the local static pressure in the vortex core, and an analysis was performed to understand the relationship between the non-cavitating vortex properties and the diameter of the elongated cavitation bubble. Acoustic emissions from the bubbles were detected during growing, splitting and collapse, revealing that the acoustic impulse created during collapse was four orders of magnitude higher than the noise emission due to growth and splitting. The dynamics and noise generation of the elongated bubbles are compared to that of spherical cavitation bubbles in quiescent flow. These data indicate that the core size and circulation are insufficient to scale the developed vortex cavitation. The non-cavitating vortex circulation and core size are not sufficient to scale the bubble dynamics, even though the single-phase pressure field is uniquely scaled by these parameters. A simple analytical model of the equilibrium state of the elongated cavitation bubble suggests that there are multiple possible equilibrium values of the elongated bubble radius, each with varying tangential velocities at the bubble interface. Thus, the details of the bubble dynamics and bubble–flow interactions will set the final bubble dimensions.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "And Vortex core line"

1

Shaw, Ryan Phillip. "Application of Subjective Logic to Vortex Core Line Extraction and Tracking from Unsteady Computational Fluid Dynamics Simulations." BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/2989.

Full text
Abstract:
Presented here is a novel tool to extract and track believable vortex core lines from unsteady Computational Fluid Dynamics data sets using multiple feature extraction algorithms. Existing work explored the possibility of extracting features concurrent with a running simulation using intelligent software agents, combining multiple algorithms' capabilities using subjective logic. This work modifies the steady-state approach to work with unsteady fluid dynamics and is designed to work within the Concurrent Agent-enabled Feature Extraction concept. Each agent's belief tuple is quantified using a predefined set of information. The information and functions necessary to set each component in each agent's belief tuple is given along with an explanation of the methods for setting the components. This method is applied to the analyses of flow in a lid-driven cavity and flow around a cylinder, which highlight strengths and weaknesses of the chosen algorithms and the potential for subjective logic to aid in understanding the resulting features. Feature tracking is successfully applied and is observed to have a significant impact on the opinion of the vortex core lines. In the lid-driven cavity data set, unsteady feature extraction modifications are shown to impact feature extraction results with moving vortex core lines. The Sujudi-Haimes algorithm is shown to be more believable when extracting the main vortex core lines of the cavity simulation while the Roth-Peikert algorithm succeeding in extracting the weaker vortex cores in the same simulation. Mesh type and time step is shown to have a significant effect on the method. In the curved wake of the cylinder data set, the Roth-Peikert algorithm more reliably detects vortex core lines which exist for a significant amount of time. the method was finally applied to a massive wind turbine simulation, where the importance of performing feature extraction in parallel is shown. The use of multiple extraction algorithms with subjective logic and feature tracking helps determine the expected probability that an extracted vortex core is believable. This approach may be applied to massive data sets which will greatly reduce analysis time and data size and will aid in a greater understanding of complex fluid flows.
APA, Harvard, Vancouver, ISO, and other styles
2

DAGAN, ARIE. "SOME ASPECTS OF VORTEX LINE RECONNECTION." Diss., The University of Arizona, 1986. http://hdl.handle.net/10150/188144.

Full text
Abstract:
Turbulence has long been believed to be associated with the behavior of vorticity. Ever since experiments showed clearly the presence of vortex structures in turbulent flow, concentrated efforts have tried to identify the important dynamics of three-dimensional vortex flow. In particular, conjectures abound about the importance of vortex stretching and vortex line reconnection. Numerical experiments based on ad hoc assumptions on the nature of the cores of vortex filaments have shown interesting behavior. In some cases, it has been argued that singularities develop in finite time and in other cases that the filament exhibits fractal dimensions. These inviscid calculations also show that filaments of opposite signed vorticity tend to pair up and that the local flow is two-dimensional. Consequently, we have begun a study that clarifies the behavior of a pair of counter-rotating vortices in the presence of an external strain flow that would be induced by the presence of vorticity well away from the local two-dimensional plane. So far, the results are quite interesting and depend on the nature of the strain flow. We always assume that the horizontal component of the strain pushes the filaments together. It is the other two components that then affect the results. Without any strain along the axes of the filaments, the vortex cores are pulled into parallel elliptical shapes. Eventually, the cores are so deformed that they become unstable in the same way a parallel shear flow would and the vortex structures disrupt. This phenomenon will be missed by filament codes that assume the cores remain circular. On the other hand, a strain component along the filaments increases the vorticity but keeps the core structure mostly circular. As the cores approach one another, viscous effects overcome the increase in vorticity due to stretching and the cores dissipate away.
APA, Harvard, Vancouver, ISO, and other styles
3

Lin, Fung-Yaw. "Core-line tracing of digital images of line drawings." Thesis, Cranfield University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302773.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Edblom, Christin. "Numerical Studies of Vortex Core States in Type II Superconductors." Thesis, Umeå universitet, Institutionen för fysik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-55159.

Full text
Abstract:
In this thesis, we study an isolated vortex in an s-wave superconductor by solving the Bogoliubov-de Gennes equations self-consistently on a disc. We calculate the order parameter and supercurrent profiles, as well as the distribution of quasiparticle states. In contrast to quasi-classical treatments, the ratio Δ∞/EF between the order parameter and the Fermi energy is not assumed negligible. We study a regime where this ratio is on the order of 10-1, relevant to high-temperature superconductors. In this regime, we find a Friedel-like oscillation in the order parameter profile at low temperatures. This oscillation is attributed to an increased level spacing of the quasiparticle states, causing a decrease of the number of states present inside the superconducting energy gap. The results are in good agreement with previously published works. In future studies, the method used in this thesis will be generalized to d-wave superconductors.<br>I detta examensarbete studeras en ensam virvel i en s-vågssupraledare genom att självkonsistent lösa Bogoliubov och de Gennes' ekvationer på en cylinderskiva. Vi beräknar ordningsparameter- och superströmsprofiler, samt fördelningen av kvasipartikeltillstånd. Till skillnad från i kvasiklassiska metoder så antas inte kvoten Δ∞/EF mellan ordningsparametern och Fermi-energin vara negligerbar. Vi studerar en regim där denna kvot är av storleksordningen 10-1, vilket är fallet i högtemperatur-supraledare. Vid låga temperaturer finner vi i denna regim en Friedelliknande oscillation i ordningsparameterprofilen. Denna oscillations förklaras genom att separationen mellan kvasipartikeltillstånd ökar, vilket får som effekt att färre tillstånd ryms innanför det supraledande energigapet. Våra resultat överensstämmer väl med tidigare publicerade artikler. I framtida studier kommer metoden vi använder i detta examensarbete att generaliseras till d-vågssupraledare.
APA, Harvard, Vancouver, ISO, and other styles
5

Persson, Milton. "Transient Dynamics and Core Tunneling in Vertical Spin-Vortex Pairs." Thesis, KTH, Tillämpad fysik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-244049.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Persson, Milton. "Transient Dynamics and Core Tunneling in Vertical Spin-Vortex Pairs." Thesis, KTH, Nanostrukturfysik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-242225.

Full text
Abstract:
Spin-vortices in vertically spaced pairs of thin elliptical Permalloy nanoparticles are investigated. The two vortex cores with parallel out-of-plane magnetization exhibit a strong monopole-like attraction through the spacer much thinner than the core length, thus forming a bound core-core pair. The material of the spacer is designed to suppress both direct and indirect exchange interactions, so the remaining inter-vortex coupling is purely dipolar. In the investigated vortex pairs, the in-plane magnetization in the vortex periphery, outside the vortex cores, curl in opposite directions (have opposite chirality). As a result, the two cores move in opposite directions in response to an in-plane magnetic field, the Zeeman effect of which acts to decouple the core-core pair. This leads to unique dynamics of the spin-vortex parallel-core/antiparallel-chirality pair, which strongly depend on whether the pair is coupled or decoupled. In the coupled state, the cores are held close together by the core-core attraction, which results in short-radius oscillations and a resonance frequency of about 2 GHz for the main rotational eigen-mode. In the decoupled state, the cores are separated by a distance much greater than the core length and gyrate independently with a resonance frequency of the order of 100 MHz. The dynamics of the vortex pair are investigated at 77 K, where there is a bistability between the coupled and decoupled core states. Resonant excitations are used to decouple the cores with pulses of ∼10 Oe in amplitude and ∼100 ps in duration. The ability to decouple a vortex pair using such fast low-power pulses can be useful for multifrequency oscillators and vortex based memory. A search for quantum effects is undertaken at sub-Kelvin temperatures using a dilution refrigerator. Square pulses of 100 ns duration and amplitudes of the order of 1 Oe are applied in-plane to bring the system closer to decoupling, giving the cores a chance to tunnel through the barrier between the coupled and decoupled states. The amplitude required for decoupling is measured as a function of temperature and a leveling off in the decoupling probability is seen below 400 mK, giving some indication of core tunneling. Macroscopic quantum tunneling of magnetization is interesting from the fundamental physics point of view, e.g., as a model system for studying the measurement paradox in quantum mechanics, as well as for current and future computer technology in terms of understanding the ultimate limitations of miniaturizing magnetic memory elements.<br>I detta arbete studeras spinnvirvlar i elliptiska skivor av Permalloy ordnade i vertikala par. Kärnor av parallell vertikal magnetisering attraherar varandra likt monopoler genom en film mycket tunnare än kärnorna och bildar därmed ett sammankopplat par. Materialet i filmen mellan virvlarna är designat för att förhindra både direkt och indirekt utbytesväxelverkan och lämnar endast kärnornas dipolväxelverkan. I de virvelpar som studeras går den plana magnetiseringen i virvlarnas periferi runt kärnorna åt olika håll (de har motsatt kiralitet). På grund av detta rör sig kärnorna åt olika håll vid applikation av magnetfält i planet (Zeeman effekten) vilket kan leda till att de kopplas isär. Detta ger virvelpar med parallella kärnor och antiparallell kiralitet unika dynamiska egenskaper som ändras med deras tillstånd, sammankopplade eller isärkopplade. I det sammankopplade tillståndet hålls kärnorna ihop av monopolattraktionen vilket gör att de bara kan röra sig i små banor kring sitt magnetiska masscentrum, med en resonansfrekvens på circa 2 GHz. I det isärkopplade tillståndet är kärnorna separerade med ett avstånd som är mycket större än kärnornas diameter, och de rör sig oberoende av varandra med en resonansfrekvens i storleksordningen 100 MHz. Virvelparets dynamik undersöks vid 77 K, där det finns en bistabilitet mellan det sammankopplade och det isärkopplade tillståndet. Pulser med längd ∼100 ps och styrka ∼10 Oe i resonans med det sammankopplade tillståndet används för att koppla isär kärnorna. Att kunna koppla isär dem med så korta lågeffektspulser kan vara användbart för virvelbaserade minnen och multifrekvensoscillatorer. Ett sökande efter kvanteffekter påbörjas vid temperaturer under 1 K med hjälp av en utspädningskyl. Fyrkantsvågor med en längd på 100 ns och en styrka i storleksordningen 1 Oe, orienterade i planet, används för att ge kärnorna en chans att tunnla genom barriären mellan det sammankopplade och det isärkopplade tillståndet. Den vågamplitud som krävs för att koppla isär kärnorna plottas mot temperaturen och kan ses plana ut under 400 mK, vilket ger viss indikation av tunnling. Dessa undersökningar av makroskopisk kvanttunnling av magnetisering kan vara användbar i grundforskning för att studera mätparadoxen i kvantmekanik, men också i modern datorteknologi för att förstå de absoluta begränsningarna i hur små magnetiska minneselement kan göras.
APA, Harvard, Vancouver, ISO, and other styles
7

Griswold, Donald L. "Dynamics of the vortex line density in superfluid turbulence /." The Ohio State University, 1986. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487267024995376.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Aronsen, Kristoffer Høyem. "An Experimental Investigation of In-line and Combined In-line and Cross-flow Vortex Induced Vibrations." Doctoral thesis, Norwegian University of Science and Technology, Department of Marine Technology, 2007. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-1894.

Full text
Abstract:
<p>This thesis presents results from an experimental investigation of hydrodynamic forces on a cylinder under prescribed harmonic motions in uniform flow. The purpose of the experiments has been to find hydrodynamic coefficients for pure in-line (IL) oscillations and investigate the interaction between IL and cross-flow (CF) vortex induced vibrations (VIV). Hydrodynamic forces are hence measured in both directions.</p><p>The experiments are performed in a towing tank of 40m, using a rigid cylinder of aspect ratio 20. The cylinder is installed in a yoke structure which in turn is suspended to an overhanging tow carriage. Model oscillations are achieved by oscillating the yoke on the carriage, while the flow velocity is obtained by moving the carriage at constant speed in still water. All experiments are performed at Reynolds number 2.4•10<sup>4</sup>. Three main types of experiments are carried out:</p><p>1. IL oscillations where the frequencies and amplitudes are varied to obtain a detailed map of the forces acting on a cylinder in the pure IL VIV regime.</p><p>2. Two degree-of-freedom motions resembling the oscillation patterns observed in a flexible beam experiment.</p><p>3. Two degree-of-freedom motion tests where the shape and direction of the orbital paths are systematically varied.</p><p>From the detailed knowledge of the excitation forces in the pure IL VIV regime, obtained in the first set of experiments, a novel approach for determining the effect of structural damping is introduced. This approach makes it possible to distinguish between the effect of structural damping and the effect of mass ratio on the response of a body subjected to VIV. A response model for predicting IL VIV is presented based on this method. The results also reveal that IL oscillations will give rise to CF forces that contribute to an earlier start-up of CF VIV, compared to conditions where the IL motion is restrained.</p><p>The results of the second set of experiments indicate that hydrodynamic coefficients from forced oscillation experiments and the assumption that strip theory is valid, can be used to predict two degree-of-freedom response of a flexible beam. In the third set of experiments it is revealed that changing the shape and direction of the orbital path significantly changes the forces acting on the cylinder. Hydrodynamic forces at multiples of the oscillation frequency, known as higher order harmonic forces, are also measured.</p>
APA, Harvard, Vancouver, ISO, and other styles
9

Stubblefield, John M. "Numerically-based ducted propeller design using vortex lattice lifting line theory." Thesis, (2 MB), 2008. http://handle.dtic.mil/100.2/ADA488219.

Full text
Abstract:
Thesis (M.S. in Naval Architecture and Marine Engineering and M.S. in Mechanical Engineering)--Massachusetts Institute of Technology, June, 2008.<br>"June 2008." Description based on title screen as viewed on August 26, 2009. DTIC Descriptor(s): Vortices, Propellers, Interactions, Theory, Theses, Lifting Surfaces, Ducts, Lattice Dynamics, Experimental Design, Numerical Methods And Procedures, Validation. DTIC Identifer(s): Ducted Propel. Includes bibliographical references (p. 49-50). Also available in print.
APA, Harvard, Vancouver, ISO, and other styles
10

Sonier, Jeffrey E. "The magnetic penetration depth and the vortex core radius in type-II superconductors." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape15/PQDD_0016/NQ27252.pdf.

Full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Books on the topic "And Vortex core line"

1

R, Khorrami Mehdi, and Langley Research Center, eds. On the effects of viscosity on the stability of a trailing-line vortex. National Aeronautics and Space Administration, Langley Research Center, 1991.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

Paintin, J. W. Computer simulations of ion-vortex line motion in superfluid helium. University ofBirmingham, 1986.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

Center, Langley Research, ed. Characterizing the wake vortex signature for an active line of sight remote sensor. Radar Systems Laboratory, Electrical and Computer Engineering Dept., Clemson University, 1994.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

W, Duck Peter, and Institute for Computer Applications in Science and Engineering., eds. The effects of viscosity on the stability of a trailing-line vortex in compressible flow. Institute for Computer Applications in Science and Engineering, NASA Langley Research Center, 1994.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
5

W, Duck Peter, and Institute for Computer Applications in Science and Engineering., eds. The effects of viscosity on the stability of a trailing-line vortex in compressible flow. Institute for Computer Applications in Science and Engineering, NASA Langley Research Center, 1994.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
6

Ontario. Ministry of Skills Development. Mining: Common Core For First Line Production Supervisor Underground Hard Rock Mining. s.n, 1986.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
7

Rogers, J. M. An analysis of semiscale Mod-2C S-FS-1 steam line break test using RELAP5/MOD2. U.S. Nuclear Regulatory Commission, 1992.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
8

Ontario. Ministry of Skills Development, ed. Common core for first line production supervisors underground hard rock mining: An interim training document : program #770120. Ministry of Skills Development, 1986.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
9

Zürich, Eidgenössische Technische Hochschule, ed. Automatic extraction of vortex core lines and other line type features for scientific visualization. 2000.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
10

Carver, Burkett Reed. Supercritical tornado-like vortices: Photogrammetry applied to an investigation of core radii and core region velocities. 1997.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Book chapters on the topic "And Vortex core line"

1

Li, Heng, Duo Wang, and Hongyi Xu. "Hairpin Vortex Formation Mechanisms Based on LXC-Liutex Core Line Method." In Liutex and Third Generation of Vortex Definition and Identification. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-70217-5_12.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Nikulin, V. V. "Space Evolution of Tornado-Like Vortex Core." In Free Boundary Problems in Continuum Mechanics. Birkhäuser Basel, 1992. http://dx.doi.org/10.1007/978-3-0348-8627-7_26.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Alvarez, Oscar, Yifei Yu, Pushpa Shrestha, Dalal Almutairi, and Chaoqun Liu. "Visualizing Liutex Core Using Liutex Lines and Tubes." In Liutex and Third Generation of Vortex Definition and Identification. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-70217-5_10.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Suzuki, Kojiro, and Hirotoshi Kubota. "Computational Studies on Topological Properties of Vortex Core Lines in Separated Flow Field Around High-Angle-of-Attack Cone-Cylinders." In Separated Flows and Jets. Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-84447-8_95.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Wu, Jie-Zhi, Hui-Yang Ma, and Ming-De Zhou. "Core Structure, Vortex Filament, and Vortex System." In Vorticity and Vortex Dynamics. Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/978-3-540-29028-5_8.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Zakharov, Vladimir E. "Dynamics of vortex line in presence of stationary vortex." In Iutam Bookseries. Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-90-481-8584-9_46.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Bishop, David J., Peter L. Gammel, and Cherry A. Murray. "Magnetic Decoration Studies of Flux Line Lattices in the Cuprate Superconductors." In The Vortex State. Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-0974-1_6.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Stanescu, James. "Review of Patricia MacCormack, Posthuman Ethics." In Speculations VI. punctum books, 2015. https://doi.org/10.21983/p3.0122.1.14.

Full text
Abstract:
Early in Patricia MacCormack’s Posthuman Ethics: Embodiment and Cultural Theory, she explains “Posthuman Ethics could have been called Posthuman Bodies” (1). This switch, from ethics to bodies, is important. It lets the reader know that the book is not going to be concerned with a normative understanding of ethics. Instead, ethics here is a Spinozian ethics, in other words a moral physics, a relation-ship of bodies to each other and how they affect one another. If that is the ethics, the posthuman should be understood in two senses. First, it means a position that exists, as Cary Wolfe has put it, “both before and after humanism.”1 In this sense, MacCormack’s work should be read as part of a long line of posthumanist theory, including Donna Haraway’s “Cyborg Manifesto” and When Species Meet, N. Katharine Hayles How We Became Posthuman, Cary Wolfe’s What is Posthumanism?, and Rosi Braidotti’s The Posthuman. However, posthuman should also be understood as the ways that all sorts of bod-ies, including non-human ones, end up entangled in and with each other. In this sense, we can see Posthuman Ethics as being part of a continuation that includes Mel Chen’s Anima-cies, Beatriz Preciado’s Testo Junkie, and Jasbir Puar’s Terrorist Assemblages. MacCormack forces us into the vortex of what Felix Guattari has referred to as “affective contamination,” which is the process by which other beings “start to exist in you, in spite of you.”2 Thus, we are treated to examinations of our entanglements with art and inhuman ecstasy, tattoos and the skin, nonhuman animals, marvelous monsters, mystic queers, and the nation of the dead. So far, so good. But also, I am sure you are asking, how is this book new? Is this just another book of posthuman theory combined with the au-thor’s preferred more-than-human objects of inquiry? This is where things get interesting, because despite MacCormack’s protests, there is still a normative ethical argument that is slowly developed throughout the present work. MacCormack is concerned with how “regimes of signification” create and produce domination (94). What emerges, then, is an ethics that cuts to the very core of what it means to do philosophy and theory.
APA, Harvard, Vancouver, ISO, and other styles
9

Nitsche, Monika. "Core Dynamics in Vortex Pairs and Rings." In IUTAM Symposium on Dynamics of Slender Vortices. Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5042-2_12.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Hoekstra, A. J., E. Van Vliet, J. J. Derksen, and H. E. A. Van Den Akker. "Vortex Core Precession in a Gas Cyclone." In Fluid Mechanics and Its Applications. Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5118-4_71.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "And Vortex core line"

1

Bhagwat, Mahendra, Manikandan Ramasamy, and Francis Caradonna. "Fundamental Characterization of Spanwise Loading and Trailed Wake Vortices." In Vertical Flight Society 71st Annual Forum & Technology Display. The Vertical Flight Society, 2015. http://dx.doi.org/10.4050/f-0071-2015-10105.

Full text
Abstract:
Rotorcraft flowfields are dominated by the vortices trailing from the blade tips. The formation, evolution and subsequent interaction of these vortices with the following blade(s) is a key to rotor airloads and performance. A fixed-wing wind tunnel test was designed to simulate the aerodynamic environment of a rotor blade tip in hover, using an upstream wing to generate an interacting vortex. Detailed surface pressure and flow field measurements were performed to better understand the relationship between the tip vortex characteristics, such the circulation distribution inside the vortex core, and the loading distribution on the generating wing. The fixed-wing loading distribution differs from a typical loading on a hovering rotor blade in that the maximum bound circulation occurs at the blade root, and not close to the tip; this is similar to a very highly twisted rotor blade, like a tilt-rotor, in hover. The wing-vortex interaction alters the wing loading such that the loading peak moves closer to the tip. The trailed circulation in the wake induced by the vortex interaction may entrain into the interacting vortex. The measurements show that this has a profound impact on the the evolution of both the wing tip vortex and the interacting vortex. These findings can be of significance to engineering models, such as the free vortex wake models typical in rotorcraft comprehensive analyses.
APA, Harvard, Vancouver, ISO, and other styles
2

Bowen-Davies, Graham. "Comparison of VortexWake, VVPM and CFD Aeromechanics Computations of the Boeing 222 Proprotor." In Vertical Flight Society 80th Annual Forum & Technology Display. The Vertical Flight Society, 2024. http://dx.doi.org/10.4050/f-0074-2018-12703.

Full text
Abstract:
An aeromechanics investigation was conducted for the Boeing 222 proprotor test in transition orientation with the comprehensive analysis code RCAS comparing vortex wake, Viscous Vortex Particle Method (VVPM) and Helios™ (CFD) calculations. The results include the calculations of rotor trim and rotor oscillatory structural loads for a proprotor in near axial orientation at high speed, high incidence transition and helicopter-like edgewise orientation. VVPM and Helios calculations gave the same wake physics for the isolated rotor and resulted in similar hub moments and blade loads sensitivities to cyclic inputs. Helios and VVPM calculations differed during BVI wherein the lifting line model of VVPM is less accurate. Vortex Wake, without tuning, produced inaccurate rotor wake trajectories, and the low speed, high incidence calculations of trim and loads were inaccurate. Helios was used to evaluate the effect of the nacelle and tunnel walls on the trim angles. The nacelle affected the wake trajectory and impacted trim, but the changes to loads was small. Modeling the rotor in close proximity to the tunnel ceiling had the opposite affect on trim to the effect relative to the Glauert wall corrections. The effect of the tunnel wall corrections calculated by Helios was smaller than the equivalent (Glauert) correction made to VVPM.
APA, Harvard, Vancouver, ISO, and other styles
3

Alvarez, Oscar, Yifei Yu, and Chaoqun Liu. "Liutex Core Line for Vortex Structure in Turbulence." In ASME 2021 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/fedsm2021-66012.

Full text
Abstract:
Abstract Liutex is a vortex identification method that provides a vector interpretation of local fluid rotation. Liutex produces a vector quantity which can be used to determine the absolute and relative strength of a vortex, the local rotation axis of a vortex, the vortex core center, the size of the vortex core, and the vortex boundary. Vortex identification and visualization is essential in computational fluid turbulence analysis and fluid mechanics in general. Until Liutex, there has not been a way to identify the core of a vortex structure or even the center of rotation of a vortex structure. Since Liutex, tools have been created to assist in the identification and analysis of vortical structures. The Liutex Core Line has been developed to better understand turbulent fluid structures. A Liutex core is defined as a concentration of Liutex vectors and defined to be unique and the Liutex core line is the center of rotation of that Liutex core. Currently, iso-surfaces are the most popular way to visualize the structure of turbulent flow but there is no reason to believe that it is the best way to represent a vortex’s structure. Previous methods that use iso-surface are strongly threshold dependent and since the Liutex core line is unique, it is independent of threshold and can show the real vortex structure. In this paper we show the benefits and promises of the Liutex Core Line as a better way of representing vortex structures.
APA, Harvard, Vancouver, ISO, and other styles
4

Shaw, Ryan, Steven Gorrell, Robert Woodley, and Michael Gosnell. "Vortex Core Line Extraction and Tracking from Unsteady Computational Fluid Dynamics Simulations Using Subjective Logic." In 50th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition. American Institute of Aeronautics and Astronautics, 2012. http://dx.doi.org/10.2514/6.2012-1261.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Inoue, Masahiro, Masato Furukawa, Kazuhisa Saiki, and Kazutoyo Yamada. "Physical Explanations of Tip Leakage Flow Field in an Axial Compressor Rotor." In ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/98-gt-091.

Full text
Abstract:
Structure of a tip leakage flow field in an axial compressor rotor has been investigated by detailed numerical simulations and appropriate post-processing. Physical explanations of the structure are made in terms of vortex-core identification, normalized helicity, vortex-lines, limiting streamlines, etc. The onset of the discrete tip leakage vortex is located on the suction surface at some distance from the leading edge. The vortex core with high vorticity is generated from a shear layer between the leakage jet flow and the main flow. The streamlines in the leakage flow are coiling around the vortex core. All the vortex-lines in the tip leakage vortex core link to ones in the suction surface boundary layer. The other vortex-lines in the suction surface boundary layer link to the vortex-lines in the pressure surface boundary layer and in the casing wall boundary layer. There are two mechanisms to reduce intensity of the tip leakage vortex: one is reduction of discharged vorticity caused by the linkage of vortex-lines between the suction surface and casing wall boundary layers, and another is diffusion of vorticity from the tip leakage vortex. Relative motion of the endwall has a substantial influence on the structure of the leakage flow field. In the case of a compressor rotor, it intensifies streamwise vorticity of the leakage vortex but reduces leakage flow loss.
APA, Harvard, Vancouver, ISO, and other styles
6

Balla, Esztella, Kinga Andrea Kovács, and Bálint Lendvai. "Comparison of Vortex Detection Methods on the Numerical Simulation of Tip Leakage Flow of a Low-Speed Axial Fan." In ASME Turbo Expo 2024: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2024. http://dx.doi.org/10.1115/gt2024-121322.

Full text
Abstract:
Abstract The present paper investigates the capabilities of the Lagrangian-Averaged Vorticity Deviation (LAVD) vortex detection method for turbomachinery applications. The tip leakage vortex of a low-speed axial fan is identified with multiple vortex detection methods. The investigation is carried out on a numerical simulation of a ducted fan. The results from the LAVD method are compared with the outcomes of the following vortex detection techniques: Q criterion, VR helicity density, vortex core distance technique of Li and Carrica, and Banks’ vorticity predictor-pressure corrector vortex core identification method. The position and extension of the vortex region and the location of the vortex core line are considered during the comparison. The results show that the vortex region and core detected by the LAVD technique are in great accordance with the outcome of the other methods. Compared to other methods, the advantage of the LAVD technique is that its parameters can be objectively defined from geometrical features of the flow field, e.g., blade chord length. The LAVD is also able to detect the core and the perimeter of the vortex region.
APA, Harvard, Vancouver, ISO, and other styles
7

Moeck, Jonas P., Jean-Francois Bourgouin, Daniel Durox, Thierry Schuller, and Sébastien Candel. "Investigation of Precessing-Vortex-Core–Flame Interaction Based on Tomographic Reconstruction Techniques." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-69626.

Full text
Abstract:
Unsteady helical flow structures, such as the precessing vortex core (PVC), are often observed in swirling flows with vortex breakdown. Although this type of flow is of high relevance for industrial combustors, the role of these flow instabilities in reacting systems, in particular their effect on flame stabilization and combustion instabilities, remains poorly understood. The three-dimensional structure of the interaction between the helical mode and the flame is difficult to assess with common measurement techniques, such as chemiluminescence imaging, due to the non-axisymmetry of the oscillation pattern. In the present work, a novel method is proposed to determine the full field of the heat release rate perturbation associated with the helical mode. This method requires only line-of-sight integrated information from a single camera. Tomographic reconstruction techniques are used, exploiting the fact that the helical mode is a rotating structure. Reconstruction algorithms are presented that are tailored to the specific spatio-temporal structure of the oscillation pattern, and it is shown that these techniques outperform standard methods. The proposed methodology is applied in a turbulent swirl-stabilized model combustor with significant PVC oscillations. Images from an intensified high-speed camera are used for the reconstruction. The analysis shows that the helical mode perturbs the flame in the inner and the outer shear layers of the annular jet and thereby creates helical traveling waves. The perturbation in the outer shear layer grows significantly in downstream direction and causes strong heat release rate fluctuations when impinging on the combustor wall.
APA, Harvard, Vancouver, ISO, and other styles
8

Lehugeur, Benjamin, and Patrick Gillie´ron. "Active Control of Vortex Breakdown Phenomenon in the Wake of a Simplified Car Geometry." In ASME 2006 2nd Joint U.S.-European Fluids Engineering Summer Meeting Collocated With the 14th International Conference on Nuclear Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/fedsm2006-98349.

Full text
Abstract:
The breakdown of longitudinal vortices originating from the rear pillars of a simplified geometry of automobile vehicles is obtained with a view to reducing aerodynamic drag. Numerical experiments are conducted on an Ahmed body according to a computation code based on the Lattice Boltzmann Method (LBM). Vortex breakdown is obtained by a continuously and uniformly blowing at the separation line prompting the formation and maintenance of the vortex. The breakdown is characterized by a sudden disintegration of the vortex core and the appearance of a recirculation zone. Numerical results obtained at several blowing velocities reveal the critical impact of the Swirl number on vortex breakdown. Moreover, breaking down the longitudinal vortices induces an increase in the static pressure at the wall of the rear window, which can bring about drag reductions close to 6%.
APA, Harvard, Vancouver, ISO, and other styles
9

Link, Sarah, Kaushal Dave, Georg Eitelberg, Arvind Gangoli Rao, and Francesca de Domenico. "The Influence of the Confinement Ratio on the Precessing Vortex Core Dynamics in a Counter-Rotating Dual Swirler." In ASME Turbo Expo 2023: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2023. http://dx.doi.org/10.1115/gt2023-101678.

Full text
Abstract:
Abstract Lean-premixed swirl-stabilized combustion is a successful strategy to reduce pollutant emissions. However, these combustion systems are especially prone to thermoacoustic instabilities. The precessing vortex core (PVC) plays a significant role in suppressing or exciting those instabilities. Therefore, it is necessary to predict the PVC dynamics in different operating conditions. The introduction of alternative aviation fuels like hydrogen in fuel-flexible gas turbines might require changes in the combustor geometry. However, the influence of particular geometric parameters on the PVC dynamics in less conventional combustion chamber configurations is not yet clear. To contribute to the knowledge of PVC dynamics in different combustor geometries, this paper presents an experimental study of the PVC dynamics in isothermal conditions in a counter-rotating dual swirler configuration in different confinement ratios. Additionally, a non-rotating axial air jet can be injected on the center line of the primary swirler as a provision for increased flashback resistance in the reacting case with H2. PVC frequencies and amplitudes are obtained by spectral proper orthogonal decomposition (SPOD) of time-resolved PIV measurements, and by time-resolved pressure measurements. The study shows that the frequency of the PVC scales with StPVC = 0.78, based on the diameter and the bulk velocity of the mixing tube. The PVC frequency is only determined by the conditions in the primary swirler and is fully independent of the amount of airflow going through the secondary counter-rotating swirler. Introducing an axial air jet on the center line decreases the PVC frequency significantly, which can be related to the change in effective swirl number. It is also shown that the smallest combustion chamber diameter results in the highest spectral energy for the PVC mode for all investigated points, hence the PVC motion is the strongest. Meanwhile, the biggest combustion chamber diameter shows the weakest pressure fluctuations. The results obtained in this study provide evidence that the periodic oscillations arising in the swirling flow field can be predicted and follow a Strouhal scaling independent of the geometry, even for more unconventional configurations.
APA, Harvard, Vancouver, ISO, and other styles
10

Yang, Fan, Yanhui Wu, Ziyun Zhang, and Zhenyang Wang. "Periodic Unsteadiness of Tip Clearance Vortex in an Axial Compressor Rotor." In ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/gt2020-15167.

Full text
Abstract:
Abstract A series of unsteady simulations, supported by experimental data, are used to characterize the periodic unsteadiness of the tip clearance vortex in an axial compressor rotor. The numerical probes detect significant periodic fluctuations in the blade tip region at near stall conditions. A reduced frequency at different condition is limited to a small range although there exist a large difference on the natural frequency. Physical explanations of the periodic fluctuations are made in terms of vortex-core identification, contour, etc. The nature of the periodic unsteadiness in the tip region is the periodic bubble-type breakdown of the tip leakage vortex induced by the broken vortex core generated by the previous breakdown. The life cycle of the broken vortex core can be summarized as three processes, generation, propagation and inducing breakdown of tip leakage vortex. The broken vortex core arrives at mid-chord of the adjacent blade, resulting in change of momentum in the tip clearance and pressure in the leading edge of the adjacent blade. The flow in this blade tip region is similarly affected by another adjacent blade. The tip leakage vortex core is bent, then the breakdown of tip clearance happens and a new broken vortex core appears accompanied by a back flow region.
APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "And Vortex core line"

1

Tunc ALdemir, Don Miller, and Peng Wang. Development of An On-Line, Core Power Distribution Monitoring System. Office of Scientific and Technical Information (OSTI), 2007. http://dx.doi.org/10.2172/920987.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Hussain, Fazle. Vortex Core Dynamics, Complex Helical Wave Decomposition, Organization of Fine-Scale Turbulence and Other Related Theoretical/Numerical Studies. Defense Technical Information Center, 1995. http://dx.doi.org/10.21236/ada299198.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Bacchiani, M., C. Medich, and M. Rigamonti. SPES-2, AP600 intergral system test S01007 2 inch CL to core make-up tank pressure balance line break. Office of Scientific and Technical Information (OSTI), 1995. http://dx.doi.org/10.2172/111438.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Avellanet, Dylan. Animal Narratives as Core Components of Veterinary Medicine. Florida International University, 2025. https://doi.org/10.25148/fiuurj.3.1.12.

Full text
Abstract:
The line between animal and human is often one that is heavily reliant on an individual’s identifications and sense of relationality. The depth of a human-animal bond shifts depending on the established terms of the particular human-animal relationship and the extent of its prior nurturing and the circumstances of its genesis. Animal narratives in turn provide insight into animal individuality that may allow for contemplation of unique, specific approaches applicable to a wide range of circumstances in veterinarian medicine. Some films encompass various facets of the human-animal divide, or lack-thereof, that may aid veterinarians in understanding patient stories. Megan Leavy (2017) examines the shared mindsets of human and canine soldiers shaped through shared circumstances of war. The Mustang (2019) considers similar themes within the confines of imprisonment. Spirit: Stallion of the Cimarron (2002) explores the manifestation of similar desires and character traits between human and animal and the paths undertaken to achieve camaraderie. These narratives create varying viewpoints regarding the importance and validity of relationships with animals all founded on a basic platform of consideration and admiration. Acknowledgement and familiarity with patients’ possible lived experiences become of crucial importance for the veterinarian due to the obvious blockade in communication. Essentially, examination of the animal narrative gives a possible voice to the animal, which bridges the gap between veterinarian and patient and serves as a conduit for more whole medicinal practice.
APA, Harvard, Vancouver, ISO, and other styles
5

Netid, Mihai. APPARATUS, SYSTEM, METHOD AND ASSOCIATED TECHNOLOGIES OF IN-LINE VORTEX MIXING OF MINI - GRANULES WITH HOMOGENIZED HEAVY OIL OR RESIN OR BITUMEN, MAINLY IN THE PREPARATION OF THE ASPHALT MIX. Intellectual Archive, 2019. http://dx.doi.org/10.32370/iaj.2070.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Pargeter, Richard. PR-164-164504-R01 Suitability of Line Pipe Materials for Sour Service. Pipeline Research Council International, Inc. (PRCI), 2018. http://dx.doi.org/10.55274/r0011509.

Full text
Abstract:
It is understood that this work relates to issues arising from a failure in a pipe carrying wet sour gas, in which cracking developed from a shallow hard feature, 1 to 3mm deep and about 50mm in diameter. The overall aim is to prevent such failures, and samples of material from this program, selected on the basis of the work reported here, have been subjected to sour testing under PRCI project SSC-2-14, and there is also a link to PRCI project NDE-4-11, which is exploring non-destructive techniques for the detection of local hard regions. This report presents the techniques used in the assessment of steel samples, and summarizes the results. Full results for each pipe sample are presented in a series of appendices. Most samples were API 5L grade X65, or the equivalent DVN OS F101 grade 450, but there was also one API 5L grade X60 pipe. All were made by thermo-mechanical controlled processing (TMCP) The majority of samples were supplied in the form of pipe rings, but three were supplied as flat plate. The core of the testing consisted of Vickers hardness measurements on metallographic sections, ranging from relatively widely spaced measurements at 10kg indenting load to detailed hardness maps at 0.1kg load. In addition bulk chemical analysis, tensile testing and Charpy testing were carried out on all samples. Near surface micro analysis and near surface carbon profile analyses were carried out on selected samples. Micrographs from all samples are presented, with detailed images related to hardness maps for selected samples.
APA, Harvard, Vancouver, ISO, and other styles
7

Kim, D. H., K. E. Gray, and J. D. Hettinger. A quantitative understanding of the enhanced irreversibility line and critical current density due to linear defects in Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8} single crystals with the vortex dimensionality-crossover model. Office of Scientific and Technical Information (OSTI), 1992. http://dx.doi.org/10.2172/10144514.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Zhu, Shixin, Heng Gao, and Gang Chen. Efficacy and Safety of PRC-063 for Attention-deficit/hyperactivity disorder: A systematic review and meta-analysis from randomized controlled trials. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, 2022. http://dx.doi.org/10.37766/inplasy2022.12.0073.

Full text
Abstract:
Review question / Objective: We conducted a systematic review and meta-analysis from randomized controlled trials to evaluate the efficacy and safety of PRC-063 for Attention-deficit/hyperactivity disorder. Condition being studied: Attention-deficit/hyperactivity disorder (ADHD) is diagnosed with the core symptoms including inattention, hyperactivity and/or impulsivity.Current treatment options for ADHD include pharmacological treatment， behavioral therapy, and combination therapy of the two treatments above. Methylphenidate (MPH) and the extended-release formulation, as a first-line pharmacological treatment of ADHD, have been widely researched in the world.
APA, Harvard, Vancouver, ISO, and other styles
9

Ugarcina Perovic, Svetlana, Vedanth Ramji, Hui Chong, Yiqian Duan, and Luis Pedro Coelho. argNorm: Normalization of antibiotic resistance gene annotations to the Antibiotic Resistance Ontology (ARO). Queensland University of Technology, 2024. http://dx.doi.org/10.5204/rep.eprints.252448.

Full text
Abstract:
Motivation: Currently available and frequently used tools for annotating antimicrobial resistance genes (ARGs) in genomes and metagenomes provide results using inconsistent nomenclature. This makes the comparison of different ARG annotation outputs challenging. The comparability of ARG annotation outputs can be improved by mapping gene names and their categories to a common controlled vocabulary such as the Antibiotic Resistance Ontology (ARO). Results: We developed argNorm, a command line tool and Python library, to normalize all detected genes across 6 ARG annotation tools (8 databases) to the ARO. argNorm also adds information to the outputs using the same ARG categorization so that they are comparable across tools. Availability and implementation: argNorm is available as an open-source tool at: https://github.com/BigDataBiology/argNorm. It can also be downloaded as a PyPI package and is available on Bioconda and as an nf-core module.
APA, Harvard, Vancouver, ISO, and other styles
10

Marsden, Eric, Romuald Perinet, and Jean Pariès. Articulation between compliance and initiative in safety management. Foundation for an industrial safety culture, 2024. http://dx.doi.org/10.57071/903aci.

Full text
Abstract:
Safety in complex systems is produced by two complementary reservoirs: procedural compliance (the anticipation of potential hazards and implementation of procedures and other preventive barriers, also called “rule-based safety”) and initiative (the actions of competent front-line workers who react appropriately to conditions in real-time, also called “managed safety”). This document analyses the articulation between these two sources of safety, and the way in which it may evolve given changes in the industrial world and in societal expectations. It suggests moving past a view of these two forms of safety as alternatives which could only develop one at the expense of the other, to explore more complex forms of interaction, such as co-development or mutual reinforcement between procedural compliance and initiative. While the core of the debate on the relationship between compliance and initiative has so far focused on the work of frontline staff and the associated micro-centered compromises, this document also examines the decisions made across the entire management line up to the executive committee (the macro-centered compromises related to safety management and risk governance), as well as inter-organizational dimensions (impacts on relations with the safety authority, the judiciary, and civil society) and the resulting systemic issues (phenomena that emerge from the interaction between system components that are not visible when analyzing each component in isolation).
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'And Vortex core line' for particular source types:
Journal articles Dissertations / Theses Books
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography