Relevant bibliographies by topics / Low Reynolds number hydrodynamics

Contents

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

Academic literature on the topic 'Low Reynolds number hydrodynamics'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Low Reynolds number hydrodynamics"

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Peterson, Mark A. "Membrane hydrodynamics at low Reynolds number." Physical Review E 53, no. 1 (January 1, 1996): 731–38. http://dx.doi.org/10.1103/physreve.53.731.

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Winkler, Roland G. "Low Reynolds number hydrodynamics and mesoscale simulations." European Physical Journal Special Topics 225, no. 11-12 (November 2016): 2079–97. http://dx.doi.org/10.1140/epjst/e2016-60087-9.

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Putz, Victor B., and Jörn Dunkel. "Low Reynolds number hydrodynamics of asymmetric, oscillating dumbbell pairs." European Physical Journal Special Topics 187, no. 1 (September 2010): 135–44. http://dx.doi.org/10.1140/epjst/e2010-01278-y.

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Felderhof, B. U. "Sedimentation of a dilute suspension in low Reynolds number hydrodynamics." Physica A: Statistical Mechanics and its Applications 348 (March 2005): 16–36. http://dx.doi.org/10.1016/j.physa.2004.08.077.

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Golestanian, Ramin, Julia M. Yeomans, and Nariya Uchida. "Hydrodynamic synchronization at low Reynolds number." Soft Matter 7, no. 7 (2011): 3074. http://dx.doi.org/10.1039/c0sm01121e.

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Alexander, G. P., and J. M. Yeomans. "Hydrodynamic Interactions at Low Reynolds Number." Experimental Mechanics 50, no. 9 (August 3, 2010): 1283–92. http://dx.doi.org/10.1007/s11340-010-9387-6.

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Tseluiko, D., S. Saprykin, C. Duprat, F. Giorgiutti-Dauphiné, and S. Kalliadasis. "Pulse dynamics in low-Reynolds-number interfacial hydrodynamics: Experiments and theory." Physica D: Nonlinear Phenomena 239, no. 20-22 (October 2010): 2000–2010. http://dx.doi.org/10.1016/j.physd.2010.07.011.

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Ichiki, Kengo, and John F. Brady. "Many-body effects and matrix inversion in low-Reynolds-number hydrodynamics." Physics of Fluids 13, no. 1 (January 2001): 350–53. http://dx.doi.org/10.1063/1.1331320.

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Holmes, David W., John R. Williams, and Peter Tilke. "Smooth particle hydrodynamics simulations of low Reynolds number flows through porous media." International Journal for Numerical and Analytical Methods in Geomechanics 35, no. 4 (February 22, 2011): 419–37. http://dx.doi.org/10.1002/nag.898.

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Ripoll, M., K. Mussawisade, R. G. Winkler, and G. Gompper. "Low-Reynolds-number hydrodynamics of complex fluids by multi-particle-collision dynamics." Europhysics Letters (EPL) 68, no. 1 (October 2004): 106–12. http://dx.doi.org/10.1209/epl/i2003-10310-1.

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Dissertations / Theses on the topic "Low Reynolds number hydrodynamics"

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Ishimoto, Kenta. "Hydrodynamics of squirming locomotion at low Reynolds numbers." 京都大学 (Kyoto University), 2015. http://hdl.handle.net/2433/199079.

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Guo, Zhifeng. "Numerical methods for the motion of particles in low Reynolds number hydrodynamics." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq24144.pdf.

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Reedha, Devesing. "Study of open channel hydrodynamics using a low-Reynolds-number turbulence model." Thesis, University of Manchester, 2003. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488444.

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Webster, John Ackroyd III. "Design and Analysis of Low Reynolds Number Marine Propellers with Computational Fluid Dynamics (CFD) Transition Modeling." Diss., Virginia Tech, 2019. http://hdl.handle.net/10919/93038.

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Small-scale marine propellers operate at low Reynolds numbers, where laminar-turbulent transition of the boundary layer can impact the distributions of pressure and shear stress on the blade surface. Marine propellers operating at low Reynolds numbers are subject to laminar-turbulent transition of the boundary layer, which impacts the distributions of pressure and shear stress on the blade surface. To design efficient propellers for operation at low Reynolds numbers, transitional effects must be included in the evaluations of propeller performance. In this work, transition modeling techniques in Reynolds Averaged Navier- Stokes computational fluid dynamics (RANS CFD) are utilized to evaluate and design propellers operating at low Reynolds numbers. The Galilean invariant γ transition model with an extension for crossflow transition is coupled to the SSG (Speziale, Sarkar, Gatski) /LRR (Launder, Reece, Rodi) -ω Reynolds stress transport turbulence model, with validation cases performed for flate plate boundary layers, 2-dimensional airfoils, a 3-dimensional wing, and 6:1 prolate spheroids. The performance of the coupled SSG/LRR-ω-γ Reynolds stress transition model for propellers with flow transition is then evaluated using experimental surface streamline and force data from four model-scale marine propellers. A method for the design of low Reynolds number marine propellers is presented using a transition-sensitive lifting line method coupled with the panel method code XFOIL. Initial geometries generated using the lifting-line method are then optimized in RANS CFD using the 2 equation γ-Reθ transition model and an adjoint method to warp the propeller shape to improve the efficiency. Two design studies are performed, including an open water propeller, and a propeller designed for a small autonomous underwater vehicle.
Doctor of Philosophy
Small-scale marine propellers exhibit transition from laminar to turbulent flow in the region near the surface of the blades. Regions of laminar and turbulent flow on the blade surface contribute differently to the overall thrust and torque on the propeller. Prediction of flow transition in the design process for small-scale marine propellers can improve the accuracy of the thrust and torque prediction compared to modeling the flow as purely laminar or turbulent. Propeller thrust and torque can be modeled using computational fluid dynamics (CFD) simulations, where transition modeling is accomplished by solving a transport equation for the intermittency γ, which represents the percentage of time the flow in a given location is turbulent. In this work, a transition model is coupled to a high-fidelity full Reynolds stress turbulence model, which solves 6 transport equations to solve for each component of the Reynolds stress tensor. The Reynolds stress tensor represents the turbulent velocity fluctuations in the governing equations solved in the CFD simulation. This coupled transition and turbulence model is then validated using experimental results of flows with a number of different transition mechanisms. The coupled model is then tested with a series of model-scale propellers, with results of the CFD simulations compared to the experimental results. A method for the design of propellers with flow transition is presented which incorporates transition effects. The designs generated by this method are then optimized in a CFD framework which morphs the blade geometry to improve the ratio of the thrust produced by the propeller to the torque, which corresponds to a higher efficiency. Two design cases are presented: a propeller designed for open water operation, and a propeller design for a small autonomous underwater vehicle.
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Vargas-Dilaz, Salvador. "Numerical simulations of hydrodynamic particle interactions at low particle Reynolds number." Thesis, University of Edinburgh, 2008. http://hdl.handle.net/1842/11500.

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When solid particles are suspended in the fluid and are not in a jammed state, a fruitful approach to modelling the system can be to describe it as a system of particles interacting both with each other and with an external field. In the specific case when the particles are far enough apart, the dominant interactions between particles are those mediated by the surrounding fluid rather than direct particle-particle interactions, possibly only when the particles are touching. One of the most important phenomena observed in this regime is particle roping – rather than being evenly dispersed throughout the fluid, particles congregate in one or more ‘ropes’ aligned with the flow direction. This can be a serious problem in coal fired power stations, which require coal dust to be evenly distributed to operate at maximum efficiency. This thesis presents a basic numerical study of particle-fluid-particle interactions under conditions characteristic of the roping phenomenon found after bends in the pneumatic transport systems of coal fired power plants. The main objectives of this work are to: 1. Obtain a pair potential hydrodynamic force field from computational fluid dynamics (CFD) simulations of two fixed spherical particles at low particle Reynolds number; 2. Estimate the magnitude of errors introduced by the pair potential approximation by comparing the two fixed spherical particles results with CFD simulations of systems of three fixed spherical particles; and 3. Use many-particle Monte Carlo simulations to investigate the conditions under which clustering or roping occurs.
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Strong, Elizabeth Ford. "Hydrodynamic loading of a porous plate at low Reynolds number conditions." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/113751.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2017.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 59-63).
In this thesis, we discuss our experimental work conducted to investigate the flow through and around porous disks driven through a viscous fluid at low Reynolds number conditions. Specifically, we present the results from a series of experiments in which we investigated the hydrodynamic drag experienced by thin (thickness to diameter ratio is t/d < 5%), circular disks of constant porosity (void fraction, [phi] = 69±2%). We characterize the dependence of the hydrodynamic loading on the size and shape of the perforations in the disk using a parameter called drag ratio, which compares the magnitudes of drag that porous and impermeable disks experienced. These experiments were conducted using a displacement controlled experimental apparatus, which, to the best of our knowledge, is the first of its kind. We benchmarked this experimental apparatus with a second experiment, and we found excellent agreement between experimental results and the analytical prediction. We find that the drag ratio depends on the effective void radius, but not on the thickness of the disks. We rationalize our results by comparing them to an existing analytical solution by way of a scaling analysis.
by Elizabeth Ford Strong.
S.M.
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Ohmura, Takuya. "Near-wall Dynamics of Active and Passive Particles at Low Reynolds Number." Kyoto University, 2018. http://hdl.handle.net/2433/232226.

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Shehata, Hisham. "Unsteady Aerodynamic/Hydrodynamic Analysis of Bio-inspired Flapping Elements at Low Reynolds Number." Diss., Virginia Tech, 2020. http://hdl.handle.net/10919/97567.

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The impressive kinematic capabilities and structural adaptations presented by bio-locomotion continue to inspire some of the advancements in today's small-scaled flying and swimming vehicles. These vehicles operate in a low Reynolds number flow regime where viscous effects dominate flow interactions, which makes it challenging to generate lift and thrust. Overcoming these challenges means utilizing non-conventional lifting and flow control mechanisms generated by unsteady flapping body motion. Understanding and characterizing the aerodynamic phenomena associated with the unsteady motion is vital to predict the unsteady fluid loads generated, to implement control methodologies, and to assess the dynamic stability and control authority of airborne and underwater vehicles. This dissertation presents experimental results for forced oscillations on multi-element airfoils and hydrofoils for Reynolds numbers between Re=104 and Re=106. The document divides the work into four main sections: The first topic presents wind tunnel measurements of lift forces generated by an oscillating trailing edge flap on a NACA-0012 airfoil to illustrate the effects that frequency and pitching amplitude have on lift enhancement. The results suggest that this dynamic trailing edge flap enhances the mean lift by up to 20% in the stalled flow regime. Using frequency response approach, it is determined that the maximum enhancement in circulatory lift amplitude occurs at stalled angles of attack for lower pitching amplitudes. The second topic presents wind tunnel measurements for lift and drag generated by a sinusoidal and non-sinusoidal oscillations of a NACA-0012 airfoil. The results show that 'trapezoidal' pitching enhances the mean lift and the RMS lift by up to 50% and 35% in the pre-stall flow regime, respectively, whereas the 'reverse sawtooth' and sinusoidal pitching generate the most substantial increase of the lift-to-drag ratio in stall and post-stall flow regimes, respectively. The third topic involves a study on the role of fish-tail flexibility on thrust and propulsive efficiency. Flexible tails enhance thrust production in comparison to a rigid ones of the same size and under the same operating conditions. Further analysis indicates that varying the tail's aspect ratio has a more significant effect on propulsive efficiency and the thrust-to-power ratio at zero freestream flow. On the other hand, changing the material's property has the strongest impact on propulsive efficiency at non-zero freestream flow. The results also show that the maximum thrust peaks correspond to the maximum passive tail amplitudes only for the most flexible case. The final topic aims to assess the unsteady hydrodynamic forces and moments generated by a three-link swimming prototype performing different swimming gaits, swimming speeds, and oscillatory frequencies. We conclude that the active actuation of the tail's first mode bending produces the most significant thrust force in the presence of freestream flow. In contrast, the second mode bending kinematics provides the most significant thrust force in a zero-freestream flow.
Doctor of Philosophy
It is by no surprise that animal locomotion continues to inspire the design of flying and swimming vehicles. Although nature produces complex kinematics and highly unsteady flow characteristics, simplified approximations to model bio-inspired locomotion in fluid flows are experimentally achievable using low degrees of freedom motion, such as pitching airfoils and trailing edge flaps. The contributions of this dissertation are divided into four primary foci: (a) wind tunnel force measurements on a flapped NACA-0012 airfoil undergoing forced pitching, (b) wind tunnel measurements of aerodynamic forces generated by sinusoidal and non-sinusoidal pitching of a NACA-0012 airfoil, (c) towing tank measurements of thrust forces and torques generated by a one-link swimming prototype with varying tail flexibilities, and (d) towing tank measurements of hydrodynamic forces and moments generated by active tail actuation of a multi-link swimming prototype. From our wind tunnel measurements, we determine that lift enhancement by a trailing edge flap is achieved under certain flow regimes and oscillating conditions. Additionally, we assess the aerodynamic forces for a sinusoidal and non-sinusoidal pitching of an airfoil and show that 'trapezoidal' pitching produces the largest lift coefficient amplitude whereas the sinusoidal and 'reverse sawtooth' pitching achieve the best lift to drag ratios. From our towing tank experiments, we note that the role of tail flexibility enhances thrust generation on a swimming device. Finally, we conclude that different kinematics on an articulating body strongly affect the hydrodynamic forces and moments. The results of the towing tank measurements are accessible from an online public database to encourage research and contribution in underwater vehicle design through physics-based low-order models that can accommodate hydrodynamic principles and geometric control concepts.
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Marchetti, Benjamin. "Sédimentation de particules : effets collectifs et filaments déformables." Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0364/document.

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Une étude expérimentale et numérique traitant de l'influence de structures tourbillonnaires sur la sédimentation de nuage de particules sphériques sous l'effet de la gravité est présentée dans une première partie de ce manuscrit. L'écoulement est créé par électro-convection, ce qui permet de générer un réseau de vortex contrôlés en vitesse et de taille constante qui imite un écoulement tourbillonnaire. Des techniques de PIV (Particle image-velocimetry) et de suivi de particules sont utilisés pour étudier la sédimentation du nuage.Le nuage est modélisé comme un ensemble de particules ponctuelles pour lesquelles les forces d'interaction hydrodynamiques entre particules sont prépondérantes. Le comportement du nuage est comparé aux prédictions obtenues avec des modèles numériques. Dans une seconde partie est présentée une étude expérimentale et numérique concernant la sédimentation à faible nombre de Reynolds de fibres flexibles dans un fluide visqueux au repos. L'état d'équilibre atteint par la fibre flexible est étudié. Nous identifions trois régimes ayant des signatures différentes sur l'état stationnaire de la fibre flexible: un régime de faibles déformations dans lequel la force de traînée est proportionnelle à celle d'une fibre sédimentant horizontalement par rapport à la gravité; un régime de grandes déformations dans lequel la force de traînée est aussi proportionnelle à la vitesse de la fibre, mais avec un coefficient de traînée qui est celui d'une fibre chutant parallèlement à la gravité; et un régime de reconfiguration élastique où le filament se déforme avec une traînée plus faible qui n'est plus proportionnelle à sa vitesse, mais à la racine carrée de celle-ci
In the first part, a jointed experimental and numerical study examining the influence of vortical structures on the settling of a cloud of solid spherical particles under the action of gravity at low Stokes numbers is presented. We use electro-convection to generate a two-dimensional array of controlled vortices which mimics a simplified vortical flow. Particle image-velocimetry and tracking are used to examine the motion of the cloud within this vortical flow. The cloud is modeled as a set of point-particles for which the hydrodynamic interaction is preponderant. The cloud behavior (trajectory, velocity, aspect ratio, break-up time …) is compared to the predictions of a two-way-coupling numerical simulation. In the second part, a jointed experimentally and numerical study on the dynamics of slender flexible filaments settling in a viscous fluid at low Reynolds number is presented. The equilibrium state of a flexible fiber settling in a viscous fluid is examined using a combination of macroscopic experiments, numerical simulations and scaling arguments. We identify three regimes having different signatures on this equilibrium configuration of the elastic filament: a weak deformation regime wherein the drag is proportional to the fiber velocity settling perpendicular to the gravity; a large deformation regime wherein the drag is proportional to the fiber velocity settling parallel to the gravity and an intermediate elastic reconfiguration regime where the filament deforms to adopt a shape with a smaller drag which is no longer linearly proportional to the velocity but to the square root of the velocity
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Srinivasa, Murthy P. "Low Reynolds Number Airfoil Aerodynamics." Thesis, Indian Institute of Science, 2000. http://hdl.handle.net/2005/229.

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In this thesis we describe the development of Reynolds- averaged Navier Stokes code for the flow past two- dimensional configuration. Particularly, emphasis has been laid on the study of low Reynolds number airfoil aerodynamics. The thesis consists of five chapters covering the back ground history, problem formulation, method of solution and discussion of the results and conclusion. Chapter I deals with a detailed background history of low Reynolds number aerodynamics, problem associated with it, state of the art, its importance in practical applications in aircraft industries. Chapter II describes the mathematical model of the flow physics and various levels of approximations. Also it gives an account of complexity of the equations at low Reynolds number regarding flow separation, transition and reattachment. Chapter III describes method of solution, numerical algorithm developed, description of various upwind schemes, grid system, finite volume discrieti-zation of the governing equations described in Chapter II. Chapter IV describes the application of the newly developed Navier Stokes code for the test cases from GAMM Workshop proceedings. Also it describes validation of the code for Euler solutions, Blasius solution for the flow past flat plate and compressible Navier Stokes solution for the flow past NACA 0012 Airfoil at low Reynolds number. Chapter V describes the application of the Navier Stokes code for the more test cases of current practical interest . In this chapter laminar separation bubble characteristics are investigated in detail regarding formation, growth and shedding in an unsteady environment. Finally the conclusion is drawn regarding the robustness of the newly developed code in predicting the airfoil aerodynamic characteristics at low Reynolds number both in steady and unsteady environment. Lastly, suggestion for future work has been highlighted.
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Books on the topic "Low Reynolds number hydrodynamics"

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Mueller, Thomas J. Low Reynolds number vehicles. Neuilly sur Seine: Agard, 1985.

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Mueller, Thomas J., ed. Low Reynolds Number Aerodynamics. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-84010-4.

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Bodnar, Andrea Claire. Low Reynolds number particle-fluid interactions. Toronto: [s.n.], 1994.

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Whalen, Margaret V. Low Reynolds number nozzle flow study. [Washington, DC]: National Aeronautics and Space Administration, 1987.

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So, Ronald M. C. On the modeling of low-Reynolds-number turbulence. Cleveland, Ohio: Lewis Research Center, 1986.

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Kohr, Mirela. Viscous incompressible flow for low Reynolds numbers. Southampton: WIT, 2004.

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Duprat, Camille, and Howard Stone, eds. Fluid-Structure Interactions in Low-Reynolds-Number Flows. Cambridge: Royal Society of Chemistry, 2015. http://dx.doi.org/10.1039/9781782628491.

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Nikas, Konstantinos-Stephen P. Low-Reynolds number computations of flow through rotating cavities. Manchester: UMIST, 1995.

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Shyy, Wei. Aerodynamics of low reynolds number flyers: Wei shyy ... [et al.]. Cambridge: Cambridge University Press, 2007.

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Morgan, Harry L. A study of high-lift airfoils at high Reynolds numbers in the Langley Low-Turbulence Pressure Tunnel. [Washington, DC]: National Aeronautics and Space Administration, Scientific and Technical Information Office, 1989.

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Book chapters on the topic "Low Reynolds number hydrodynamics"

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Hinch, E. J. "Hydrodynamics at Low Reynolds Numbers: A Brief and Elementary Introduction." In Disorder and Mixing, 43–56. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-2825-1_4.

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Pozrikidis, C. "Low-Reynolds-number flow." In Fluid Dynamics, 591–667. Boston, MA: Springer US, 2016. http://dx.doi.org/10.1007/978-1-4899-7991-9_9.

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Pozrikidis, Constantine. "Low Reynolds Number Flow." In Fluid Dynamics, 494–561. Boston, MA: Springer US, 2009. http://dx.doi.org/10.1007/978-0-387-95871-2_9.

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Kalliadasis, S., C. Ruyer-Quil, B. Scheid, and M. G. Velarde. "Methodologies for Low-Reynolds Number Flows." In Applied Mathematical Sciences, 95–144. London: Springer London, 2012. http://dx.doi.org/10.1007/978-1-84882-367-9_5.

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Gough, T. D., and P. E. Hancock. "Low Reynolds Number Turbulent Near Wakes." In Advances in Turbulence VI, 445–48. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-0297-8_126.

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Wagner, C., and R. Friedrich. "Reynolds stress budgets of low Reynolds number pipe expansion flow." In Advances in Turbulence VI, 51–54. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-0297-8_13.

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Segawa, T., M. Sano, A. Naert, and J. A. Glazier. "High Rayleigh Number Turbulence of a Low Prandtl Number Fluid." In Flow at Ultra-High Reynolds and Rayleigh Numbers, 247–57. New York, NY: Springer New York, 1998. http://dx.doi.org/10.1007/978-1-4612-2230-9_16.

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Gad-El-Hak, Mohamed. "Control of Low-Reynolds-Number Airfoils: A Review." In Lecture Notes in Engineering, 246–70. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-84010-4_19.

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Siddiqi, S., R. Evangelista, and T. S. Kwa. "The Design of a Low Reynolds Number RPV." In Lecture Notes in Engineering, 381–93. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-84010-4_28.

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Alshehri, Hashim, Nesreen Althobaiti, and Jian Du. "Low Reynolds Number Swimming with Slip Boundary Conditions." In Lecture Notes in Computer Science, 149–62. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-50426-7_12.

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Conference papers on the topic "Low Reynolds number hydrodynamics"

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Constantinides, Yiannis, Kamaldev Raghavan, Metin Karayaka, and Don Spencer. "Tandem Riser Hydrodynamic Tests at Prototype Reynolds Number." In ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/omae2013-10951.

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Deepwater riser interference is an area of significant technical complexity and uncertainty in the design cycle due to the intricacies of wake hydrodynamics. Existing models, found in industry guidelines, are based on approximate theoretical models of bare cylinder wake and nominally checked against small scale tests at low Reynolds numbers. In actual conditions the Reynolds number is sufficiently higher and the risers are fitted with vortex-induced vibration (VIV) suppression devices. This raises questions on the applicability of the standard models and hydrodynamic coefficients used, especially if the geometry is different than a circular cylinder. A series of full scale tests, at supercritical Reynolds numbers, were conducted to address these uncertainties and obtain hydrodynamic coefficients for interference design. The tests were carried out utilizing two full scale cylinders fitted with actual VIV suppression devices and towed either in fixed or spring supported configurations. The paper discusses the experimental methodology and findings from the testing program, showing deviations from the standard models found in industry codes.
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Feng, Zhi-Gang, Yusheng Feng, and Maria Andersson. "Shape Effects on the Drag Force and Motion of Nano and Micro Particles in Low Reynolds Number Flows." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-89469.

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Particulate flows are commonly found in a variety of applications. For example, nanoparticles have been used in targeted drug delivery systems and improving heat transfer in nanofluids. Crucial to the development of technologies that incorporate nanoparticles is to understand the effect of a nanoparticle’s shape on its motion. The effect of shape on nanoparticles used in drug delivery, in particular, is a very active area of experimental investigation. Also, the determination of the coefficients of hydrodynamic forces or drag forces on nanoparticles of different shapes is crucial in designing effective nanoparticle-mediated therapies. In this study we present a resolved discrete particle method (RDPM), which is also called the Direct Numerical Simulation (DNS), to investigate the effect of shape on drag force in a vicious fluid. Three different shapes of particles are studied: a sphere, a probate ellipsoid, and an oblate ellipsoid. These particles have the same volume and are placed in contact with the bottom wall in simple shear flows. Their drag forces are computed numerically; it is found that the particle shape has a significant effect on the drag forces. In the case of a spherical particle, our results agree very well with the analytical results found in the literature. The motion of three particles of the same volume but different shape in a simple shear flows are also simulated. It shows that different particle shapes cause particles to experience different hydrodynamics forces, leading them to different velocities and paths.
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Wang, J., C. Shi, Y. Liu, and X. Bao. "Simulations on Hydrodynamic Coefficients of Stationary Cactus-Shaped Cylinders at a Low Reynolds Number." In ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-78472.

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Flexible cylinders, such as marine risers, often experience sustained vortex-induced vibration (VIV). Both helical strakes and fairings are demonstrated to be effective in suppressing VIV, while, helical strakes result in large drag, which increases the rotational angle and bending moment at the riser hang-off location and, fairings are cumbersome in term of storage, installation and maintenance. This study was inspired by the giant Saguaro Cacti which grow in desert region. Saguaro Cacti have shallow root system, but can grow up to fifty feet in height and can withstand very high wind velocities. In this study, numerical simulations of flow past a stationary cactus-shaped cylinder are performed in two-dimensional field at a low Reynolds number of 200. The hydrodynamic coefficients and the vortex-shedding patterns of a cactus-shaped cylinder are compared with those of a circular cylinder. In addition, a set of two cactus-shaped cylinders of tandem arrangement are also studied to investigate the effects of wake. Results showed that a cactus-shaped cylinder can reduce the drag, lift, and Strouhal number, which suggests its potential as an alternative technology to suppress VIV of a riser.
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Elbanhawy, Amr, and Ali Turan. "Heat Transfer and Wake Interaction Dynamics for Low Mass-Damping Cylinder Undergoing Flow-Induced Vibration at High Reynolds Number." In ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting collocated with 8th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2010. http://dx.doi.org/10.1115/fedsm-icnmm2010-30922.

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The current open literature carries numerous publications about the dynamics of single structures freely oscillating in response to flow-induced forces of a cross-stream. Influence of controlled oscillations on heat transfer for relatively low Reynolds number cross-flow has been looked at previously, nonetheless, high Reynolds number measurements are difficult to obtain. Studies on the flow field in the vicinity of bodies with Flow-Induced Vibration (FIV) and its interaction with surface heat flux are what the current literature needs to enhance realization of such phenomenon and advance equipment design. The present study aims firstly at investigating the influence of cylinder’s heat flux on (FIV) response and vice versa. Secondly, it explores the influence of high Reynolds number (140,000) both on the cylinder’s response and on heat transfer. An unsteady numerical framework is employed for the simulations, incorporating an Arbitrary Lagrangian Eulerian method for the associated grid deformation to simulate the coupled motion of the low mass-damping circular cylinder with a single degree of freedom in the initial regime. Attention is paid towards resolving the large scales of the fluid motion and the inherent coupling of the cylinder’s motion towards the associated evolution of the time averaged flow field. The cylinder is assumed to have a constant heat flux while Large Eddy Simulation is used to solve for the turbulent flow field. Predictions show that significant changes occur to cylinder hydrodynamics and Reynolds stresses due to FIV. Wake mixing is enhanced and kinetic energy production field is qualitatively altered. Heat flux results in a noticeable increase in response amplitude for FIV cases while surface temperature and heat transfer coefficient undergo qualitative modifications in FIV scenario as opposed to a static cylinder. The variance of Nusselt number increases at parts of the cylinder’s circumference due to FIV.
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Motin, Abdul, Volodymyr V. Tarabara, and André Bénard. "CFD Study of Hydrodynamics and Separation Performance of a Novel Crossflow Filtration Hydrocyclone (CFFH)." In ASME 2014 4th Joint US-European Fluids Engineering Division Summer Meeting collocated with the ASME 2014 12th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/fedsm2014-21289.

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This research addresses various hydrodynamic aspects and the separation performance of a novel cross-flow filtration hydrocyclone (CFFH) using computational fluid dynamics. A CFFH is a device that combines the desirable attributes of a cross-flow filter and a vortex separator into one unit to separate oil from water. The velocity and pressure fields within the CFFH are estimated by numerically solving the filtered Navier-Stokes equations (by using a Large Eddy Simulation (LES) approach). The Lagrangian approach is employed for investigating the trajectories of dispersed droplets based on a stochastic tracking method called the Discrete Phase Model (DPM). The mixture theory with the Algebraic Slip Model (ASM) is also used to compute the dispersed phase fluid mechanics and for comparing with results obtained from the DPM. In addition, a comparison between the statistically steady state results obtained by the LES with the Wall Adaptive Local Eddy-Viscosity (WALE) subgrid scale model and the Reynolds Average Navier-Stokes (RANS) closed with the Reynolds Stress Model (RSM) is performed for evaluating their capabilities with regards to the flow field within the CFFH and the impact of the filter medium. Effects of the Reynolds number, the permeability of the porous filter, and droplet size on the internal hydrodynamics and separation performance of the CFFH are investigated. Results indicate that for low feed concentration of the dispersed phase, separation efficiency obtained based on multiphase and discrete phase simulations is almost the same. Higher Reynolds number flow simulations exhibit an unstable core and thereby numerous recirculation zones in the flow field are observed. Improved separation efficiency is observed at a lower Reynolds number and for a lower permeability of the porous filter.
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Kalathoor, Sriram, and S. R. Chakravarthy. "Multi-Scale Computational Simulation of Combustion Instability and Transition in a Model Afterburner." In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-63805.

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A multiple length and time scale approach is adopted to perform large eddy simulation (LES) of combustion instability in a model afterburner. In this framework, the full compressible Navier-Stokes equations are decomposed into incompressible flow to leading order and acoustic equations to first order. The basis for this decomposition is the disparity in the time and length scales of the flow and acoustic propagation respectively. The present framework yields a coupling between the flow field and acoustic field, in terms of the flow dilatation and acoustic Reynolds stress (ARS). Test cases for various Reynolds numbers (based on mass flow rates) are simulated within this framework, and used to study the dynamics of transition and instability in a model afterburner. As the Reynolds number is increased, the dominant frequency switches from being that of the acoustic mode to the hydrodynamic mode. When the excitation to the acoustic field from the combustion is switched off, a high frequency relating to the transverse acoustic mode of the combustor is observed to be excited in the flow field as an acoustic feedback to the flow. When the acoustic excitation is turned back on, the transverse acoustic mode excitation of the hydrodynamics continues to prevail, illustrating a hysteretic effect. The dominant excitation of hydrodynamic mode at high Reynolds number clearly shows a rapid mixing and shortened length of heat release rate zone, when compared to the case at low Reynolds number as well as when the flow and acoustic simulations are uncoupled.
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Shahriari, Shahrokh, Ibrahim Hassan, and Lyes Kadem. "Validation of a Smoothed Particle Hydrodynamics Code for Internal Flow Simulations: Application to Hemodynamics in a Realistic Left Heart Cavity Model." In ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting collocated with 8th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2010. http://dx.doi.org/10.1115/fedsm-icnmm2010-31149.

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A numerical simulation of flow in the left heart cavity, left ventricle, based on Smoothed Particle Hydrodynamics, a meshfree particle method is presented. Most of the works using this numerical method have been dedicated to simulation of free surface flows or internal flows with low Reynolds number. The present study is the first work dedicated to simulate the complex flow in a realistic rigid model of left ventricle applying the realistic pulsatile inlet velocity (having moderate Reynolds number) using a meshfree particle method. The numerical validation of our code is performed through the simulation of flow in a cavity at a Reynolds number equal to 1000. Also, the comparison of the results of flow simulation in a simplified geometry of left ventricle with the finite volume results is presented. The smoothed particle hydrodynamics method was able to resolve the flow patterns showing its potential to be applied in complex cardiovascular flow simulations.
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Anagnostopoulos, P., A. Koutras, and S. A. Seitanis. "Numerical Study of Oscillatory Flow Past a Pair of Cylinders at Low Reynolds and Keulegan-Carpenter Numbers." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-32178.

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The results of a numerical study of the viscous oscillating flow around a pair of circular cylinders are presented herein, for a constant frequency parameter, β, equal to 50, and Keulegan-Carpenter numbers, KC, ranging between 0.2 and 10. The cylinders were placed side-by-side to the oncoming flow, for a pitch to diameter ratio, P/D, equal to 1.2. The finite-element method was employed for the solution of the Navier-Stokes equations, in the formulation where the stream function and the vorticity are the field variables. The streamlines and vorticity contours generated from the solution were used for the flow visualization. At low values of the Keulegan-Carpenter number the flow remains symmetrical with respect to the horizontal axis of symmetry of the domain. As the Keulegan-Carpenter number is increased asymmetries appear in the flow, which are eventually amplified and lead finally to more complicated vortex-shedding patterns. These asymmetries generate an aperiodic flow configuration at consecutive cycles, which becomes almost chaotic as KC grows larger. For the various Keulegan-Carpenter numbers examined the traces of the hydrodynamic forces are presented, and the r.m.s. values of the hydrodynamic forces and the coefficients of the in-line force were evaluated.
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Kendoush, Abdullah Abbas. "Hydrodynamics and Heat Convection From a Disk Facing a Uniform Flow." In ASME 2004 Heat Transfer/Fluids Engineering Summer Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/ht-fed2004-56797.

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Exact solutions of the equations of momentum and energy of a circular disk in a uniform incompressible flow directed along its axis of symmetry are obtained. Laminar, irrotational and inviscid flows were assumed. The solutions for the pressure distribution, drag coefficient and convective heat transfer of the disk are presented in explicit forms. Some peculiar fluid-dynamical behavior of the pressure distribution at low and high Reynolds numbers are revealed. The derived equations were agreeable with other numerical and analytical solutions and experimental data.
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Szwalek, Jamison L., and Carl M. Larsen. "Reynolds Number Effects on Hydrodynamic Coefficients for Pure In-Line and Pure Cross-Flow Forced Vortex Induced Vibrations." In ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/omae2009-79399.

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In-line vibrations have been noted to have an important contribution to the fatigue of free spanning pipelines. Still, in-line contributions are not usually accounted for in current VIV prediction models. The present study seeks to broaden the current knowledge regarding in-line vibrations by expanding the work of Aronsen (2007) to include possible Reynolds number effects on pure in-line forced, sinusoidal oscillations for four Reynolds numbers ranging from 9,000 to 36,200. Similar tests were performed for pure cross-flow forced motion as well, mostly to confirm findings from previous research. When experimental uncertainties are accounted for, there appears to be little dependence on Reynolds number for all three hydrodynamic coefficients considered: the force in phase with velocity, the force in phase with acceleration, and the mean drag coefficient. However, trends can still be observed for the in-line added mass in the first instability region and for the transition between the two instability regions for in-line oscillations, and also between the low and high cross-flow added mass regimes. For Re = 9,000, the hydrodynamic coefficients do not appear to be stable and can be regarded as highly Reynolds number dependent.
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Reports on the topic "Low Reynolds number hydrodynamics"

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Gimelsheim, N., J. Duncan, T. Lilly, S. Gimelshein, A. Ketsdever, and I. Wysong. Surface Roughness Effects in Low Reynolds Number Channel Flows. Fort Belvoir, VA: Defense Technical Information Center, June 2006. http://dx.doi.org/10.21236/ada454769.

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Gopalarothnam, Ashok, and Gregory Z. McGowan. Numerical Study of Unsteady Low-Reynolds Number Wing Performance. Fort Belvoir, VA: Defense Technical Information Center, February 2008. http://dx.doi.org/10.21236/ada479418.

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Ol, Michael V. Unsteady Low-Reynolds Number Aerodynamics for Micro Air Vehicles (MAVs). Fort Belvoir, VA: Defense Technical Information Center, August 2007. http://dx.doi.org/10.21236/ada472788.

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Bianchi, J. Christopher. Velocity measurements of low Reynolds number tube flow using fiber-optic technology. Office of Scientific and Technical Information (OSTI), March 1993. http://dx.doi.org/10.2172/10140118.

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Bianchi, J. C. Velocity measurements of low Reynolds number tube flow using fiber-optic technology. Office of Scientific and Technical Information (OSTI), March 1993. http://dx.doi.org/10.2172/6625783.

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Blaylock, Myra L., David Charles Maniaci, and Brian R. Resor. Numerical Simulations of Subscale Wind Turbine Rotor Inboard Airfoils at Low Reynolds Number. Office of Scientific and Technical Information (OSTI), April 2015. http://dx.doi.org/10.2172/1178361.

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Gable, C., B. J. Travis, R. J. O`Connell, and H. A. Stone. Interface deformation in low reynolds number multiphase flows: Applications to selected problems in geodynamics. Office of Scientific and Technical Information (OSTI), June 1995. http://dx.doi.org/10.2172/80379.

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Miley, S. J. Addendum to a catalog of low Reynolds number airfoil data for wind turbine applications. Office of Scientific and Technical Information (OSTI), February 1985. http://dx.doi.org/10.2172/5801393.

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Rui Shi, Davide Wüthrich, and Hubert Chanson. Intrusive and Non-intrusive Air-water Flow Measurements in Breaking Jumps at Low Froude Number and Large Reynolds Number. The University of Queensland, January 2021. http://dx.doi.org/10.14264/4a0c07f.

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Ayoul-Guilmard, Q., S. Ganesh, M. Nuñez, R. Tosi, F. Nobile, R. Rossi, and C. Soriano. D5.3 Report on theoretical work to allow the use of MLMC with adaptive mesh refinement. Scipedia, 2021. http://dx.doi.org/10.23967/exaqute.2021.2.002.

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This documents describes several studies undertaken to assess the applicability of MultiLevel Monte Carlo (MLMC) methods to problems of interest; namely in turbulent fluid flow over civil engineering structures. Several numerical experiments are presented wherein the convergence of quantities of interest with mesh parameters are studied at different Reynolds’ numbers and geometries. It was found that MLMC methods could be used successfully for low Reynolds’ number flows when combined with appropriate Adaptive Mesh Refinement (AMR) strategies. However, the hypotheses for optimal MLMC performance were found to not be satisfied at higher turbulent Reynolds’ numbers despite the use of AMR strategies. Recommendations are made for future research directions based on these studies. A tentative outline for an MLMC algorithm with adapted meshes is made, as well as recommendations for alternatives to MLMC methods for cases where the underlying assumptions for optimal MLMC performance are not satisfied.
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