Log in

Relevant bibliographies by topics / Elliptic cylinder / Journal articles

To see the other types of publications on this topic, follow the link: Elliptic cylinder.

Journal articles on the topic 'Elliptic cylinder'

Author: Grafiati

Published: 4 June 2021

Last updated: 4 February 2022

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

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Elliptic cylinder.'

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.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Hamid, A. K. "Iterative Scattering by Two PEMC Elliptic Cylinders." Advanced Electromagnetics 7, no. 5 (September 19, 2018): 49–52. http://dx.doi.org/10.7716/aem.v7i5.734.

Full text

Abstract:

Iterative procedure is implemented to derive rigorous solution to the problem of plane electromagnetic wave scattering by couple of perfect electromagnetic conducting (PEMC) elliptic cylinders due co and cross polarized scattered fields among cylinders. The translation addition theorem for Mathieu functions is enforced to compute the higher order scattered fields by single PEMC elliptic cylinder in terms of the other elliptic cylinder coordination system to impose the boundary conditions. The kth co and cross polarized scattered field coefficient expressions are extracted by iteration procedure without using matrix inversion.

APA, Harvard, Vancouver, ISO, and other styles

2

Gallardo, José P., Helge I. Andersson, and Bjørnar Pettersen. "Three-dimensional instabilities in oscillatory flow past elliptic cylinders." Journal of Fluid Mechanics 798 (June 3, 2016): 371–97. http://dx.doi.org/10.1017/jfm.2016.319.

Full text

Abstract:

We investigate the early development of instabilities in the oscillatory viscous flow past cylinders with elliptic cross-sections using three-dimensional direct numerical simulations. This is a classical hydrodynamic problem for circular cylinders, but other configurations have received only marginal attention. Computed results for some different aspect ratios ${\it\Lambda}$ from 1 : 1 to 1 : 3, all with the major axis of the ellipse aligned in the main flow direction, show good qualitative agreement with Hall’s stability theory (J. Fluid Mech., vol. 146, 1984, pp. 347–367), which predicts a cusp-shaped curve for the onset of the primary instability. The three-dimensional flow structures for aspect ratios larger than 2 : 3 resemble those of a circular cylinder, whereas the elliptical cross-section with the lowest aspect ratio of 1 : 3 exhibits oblate rather than tubular three-dimensional flow structures as well as a pair of counter-rotating spanwise vortices which emerges near the tips of the ellipse. Contrary to a circular cylinder, instabilities for an elliptic cylinder with sufficiently high eccentricity emerge from four rather than two different locations in accordance with the Hall theory.

APA, Harvard, Vancouver, ISO, and other styles

3

Ota, Terukazu, and Hideya Nishiyama. "Flow Around Two Elliptic Cylinders in Tandem Arrangement." Journal of Fluids Engineering 108, no. 1 (March 1, 1986): 98–103. http://dx.doi.org/10.1115/1.3242551.

Full text

Abstract:

Flow around two elliptic cylinders in tandem arrangement was experimentally investigated through measurements of the surface static pressure distribution and estimations of the flow parameters such as the drag, lift and moment coefficients. The elliptic cylinders examined had an axis ratio of 1:3 and they were aranged in tandem with an identical angle of attack. The angle of attack ranged from 0 to 90 deg and the nondimensional cylinder spacing l/c from 1.03 to 4.0, where l denotes the distance between the cylinder centers and c is the major axis. It has been found that the flow characteristics vary drastically with the angle of attack and also the cylinder spacing.

APA, Harvard, Vancouver, ISO, and other styles

4

Hamid, A. K., and F. Cooray. "Two-Dimensional Scattering by a Homogeneous Gyrotropic-Type Elliptic Cylinder." Advanced Electromagnetics 5, no. 3 (December 30, 2016): 106. http://dx.doi.org/10.7716/aem.v5i3.401.

Full text

Abstract:

The separation of variables procedure has been employed for solving the problem of scattering from an infinite homogeneous gyrotropic-type (G-type) elliptic cylinder, when a uniform plane electromagnetic wave perpendicular to its axis, illuminates it. The formulation of the problem involves expanding each electric and magnetic field using appropriate elliptic vector wave functions and expansion coefficients. Imposing suitable boundary conditions at the surface of the elliptic cylinder yields the unknown expansion coefficients related to the scattered and the transmitted fields. To demonstrate how the various G-type materials and the size of the cylinder affects scattering from it, plots of scattering cross sections are given for cylinders having different permittivity/permeability tensors and sizes.

APA, Harvard, Vancouver, ISO, and other styles

5

HASHEMINEJAD, SEYYED M., and R. SANAEI. "ACOUSTIC RADIATION FORCE AND TORQUE ON A SOLID ELLIPTIC CYLINDER." Journal of Computational Acoustics 15, no. 03 (September 2007): 377–99. http://dx.doi.org/10.1142/s0218396x07003275.

Full text

Abstract:

Exact expressions for the acoustic radiation torque and force components experienced by elastic cylinders of elliptic cross-section immersed in ideal fluids and placed in a progressive or standing wave field is developed. The classical method of eigen-function expansion and the pertinent boundary conditions are employed to develop analytical expressions in the form of infinite series involving Mathieu and modified Mathieu functions. The complications arising due to the nonorthogonality of angular Mathieu functions corresponding with distinct wave numbers as well as problems associated with the appearance of additional angular dependent terms in the boundary conditions are all avoided in an elegant manner by expansion of the angular Mathieu functions in terms of transcendental functions and subsequent integration, leading to a linear set of independent equations in terms of the unknown scattering coefficients. Numerical calculations of the radiation force and torque function amplitudes are performed in a wide range of frequencies and cross-sectional eccentricities for a stainless steel cylinder submerged in water. Particular attention is paid to assessment of the effects of cross-sectional ellipticity as well as incident field asymmetry on the acoustic radiation force/torque acting on the elliptical cylinder. Limiting case involving an elastic circular or elliptic cylinder in an ideal fluid is considered and fair agreements with well-known solutions are established.

APA, Harvard, Vancouver, ISO, and other styles

6

Hamid, A.-K., and W. Obaid. "RCS of Chiral Elliptic Cylinder Embedded in Infinite Chiral Medium." International Journal of Electrical and Computer Engineering (IJECE) 7, no. 5 (October 1, 2017): 2731. http://dx.doi.org/10.11591/ijece.v7i5.pp2731-2737.

Full text

Abstract:

This paper presents an analytic solution to the scattering properties of chiral elliptic cylinder embedded in infinite chiral medium due to incident plane wave. The external electromagnetic fields as well as the internal electromagnetic fields are written in terms Mathieu functions and expansion coefficients. In order to obtain both the internal and external unknown field expansion coefficients, the boundary conditions are applied rigorously at the surface of different chiral/chiral material. Results are plotted graphically for the normalized scattering widths for elliptic cylinders of different sizes and chiral materials to show the effects of these parameters on scattering cross widths. It is shown numerically by adding the external chiral material to elliptic cylinder provides more parameters to control the RCS.

APA, Harvard, Vancouver, ISO, and other styles

7

ZHANG, CAOYING, HUILI TAN, MUREN LIU, LINGJIANG KONG, and HAIPING FANG. "LATTICE BOLTZMANN SIMULATION OF A SINGLE CHARGED ELLIPTIC CYLINDER IN A NEWTONIAN FLUID." International Journal of Modern Physics B 18, no. 17n19 (July 30, 2004): 2757–61. http://dx.doi.org/10.1142/s0217979204026044.

Full text

Abstract:

A two-dimensional dynamics model of an elliptic cylinder is derived by using the lattice Boltzmann method. With the present model, we have simulated the sedimentation of a single charged elliptic cylinder in a two-dimensional tube in a Newtonian fluid. Due to the polarizing effects and non-axial symmetry shape, there are the Coulomb force and the Coulomb torque on the elliptic cylinder during the sedimentation, which change its ordinary motion significantly. Comparing with the sedimentation of an un-charged elliptic cylinder under the same initial condition, we have further discussed the dynamics characteristics of the charged elliptic cylinder, and obtained some interesting results.

APA, Harvard, Vancouver, ISO, and other styles

8

Ota, T., H. Nishiyama, J. Kominami, and K. Sato. "Heat Transfer From Two Elliptic Cylinders in Tandem Arrangement." Journal of Heat Transfer 108, no. 3 (August 1, 1986): 525–31. http://dx.doi.org/10.1115/1.3246966.

Full text

Abstract:

An experimental investigation has been conducted to clarify heat transfer characteristics of two elliptic cylinders having an axis ratio 1:2. They were placed in tandem arrangements and their angles of attack to the upstream uniform flow were identical. The testing fluid was air and the Reynolds number based on the major axis length c ranged from about 15,000 to 80,000. The angle of attack was varied from 0 to 90 deg at 30 deg intervals and the nondimensional cylinder spacing l/c from 1.25 to 4.0, where l denotes the streamwise distance between the cylinder centers. It has been found that the heat transfer features vary drastically with the angle of attack and also with the cylinder spacing.

APA, Harvard, Vancouver, ISO, and other styles

9

CHAN, ANDRE S., PETER A. DEWEY, ANTONY JAMESON, CHUNLEI LIANG, and ALEXANDER J. SMITS. "Vortex suppression and drag reduction in the wake of counter-rotating cylinders." Journal of Fluid Mechanics 679 (May 12, 2011): 343–82. http://dx.doi.org/10.1017/jfm.2011.134.

Full text

Abstract:

The flow over a pair of counter-rotating cylinders is investigated numerically and experimentally. It is demonstrated that it is possible to suppress unsteady vortex shedding for gap sizes from one to five cylinder diameters, at Reynolds numbers from 100 to 200, expanding on the more limited work by Chan & Jameson (Intl J. Numer. Meth. Fluids, vol. 63, 2010, p. 22). The degree of unsteady wake suppression is proportional to the speed and the direction of rotation, and there is a critical rotation rate where a complete suppression of flow unsteadiness can be achieved. In the doublet-like configuration at higher rotational speeds, a virtual elliptic body that resembles a potential doublet is formed, and the drag is reduced to zero. The shape of the elliptic body primarily depends on the gap between the two cylinders and the speed of rotation. Prior to the formation of the elliptic body, a second instability region is observed, similar to that seen in studies of single rotating cylinders. It is also shown that the unsteady wake suppression can be achieved by rotating each cylinder in the opposite direction, that is, in a reverse doublet-like configuration. This tends to minimize the wake interaction of the cylinder pair and the second instability does not make an appearance over the range of speeds investigated here.

APA, Harvard, Vancouver, ISO, and other styles

10

Paul, Immanuvel, K. Arul Prakash, and S. Vengadesan. "Numerical analysis of laminar fluid flow characteristics past an elliptic cylinder." International Journal of Numerical Methods for Heat & Fluid Flow 24, no. 7 (August 26, 2014): 1570–94. http://dx.doi.org/10.1108/hff-10-2012-0225.

Full text

Abstract:

Purpose – The purpose of this paper is to study the effects of Angle of Attack (AOA), Axis Ratio (AR) and Reynolds number (Re) on unsteady laminar flow over a stationary elliptic cylinder. Design/methodology/approach – The governing equations of fluid flow over the elliptic cylinder are solved numerically on a Cartesian grid using Projection method based Immersed Boundary technique. This numerical method is validated with the results available in open literature. This scheme eliminates the requirement of generating a new computational mesh upon varying any geometrical parameter such as AR or AOA, and thus reduces the computational time and cost. Findings – Different vortex shedding patterns behind the elliptic cylinder are identified and classified using time averaged centerline streamwise velocity profile, instantaneous vorticity contours and instantaneous streamline patterns. A parameter space graph is constructed in order to reveal the dependence of AR, AOA and Re on vortex shedding. Integral parameters of flow such as mean drag, mean lift coefficients and Strouhal number are calculated and the effect of AR, AOA and Re on them is studied using various pressure and streamline contours. Functional relationships of each of integral parameters with respect to AR, AOA and Re are proposed with minimum percentage error. Practical implications – The results obtained can be used to explain the characteristics of flow patterns behind slender to bluff elliptical cylinders which found applications in insect flight modeling, heat exchangers and energy conservation systems. The proposed functional relationships may be very useful for the practicing engineers in those fields. Originality/value – The results presented in this paper are important for the researchers in the area of bluff body flow. The dependence of AOA on vortex shedding and flow parameters was never reported in the literature. These results are original, new and important.

APA, Harvard, Vancouver, ISO, and other styles

11

Chandna, A. "Flow past an elliptic cylinder." Journal of Computational and Applied Mathematics 85, no. 2 (November 1997): 203–14. http://dx.doi.org/10.1016/s0377-0427(97)00035-6.

Full text

APA, Harvard, Vancouver, ISO, and other styles

12

Ragheb, H. A., and L. Shafai. "Electromagnetic scattering from a dielectric-coated elliptic cylinder." Canadian Journal of Physics 66, no. 12 (December 1, 1988): 1115–22. http://dx.doi.org/10.1139/p88-177.

Full text

Abstract:

An exact treatment using the boundary-value method for solving the problem of scattering of a line-source field or a plane wave by a perfectly conducting elliptic cylinder coated with a confocal dielectric elliptical shell is presented. For the line-source excitation the total field is calculated, while for the plane-wave excitation the echo width is obtained. A sample and interesting results for the backscattering echo width versus different geometrical parameters are obtained and presented. A set of design-type curves, which are useful for locating the maximum or minimum backscattering echo width, are also provided.

APA, Harvard, Vancouver, ISO, and other styles

13

Jin, Y., and L. P. Chamorro. "Passive pitching of splitters in the trailing edge of elliptic cylinders." Journal of Fluid Mechanics 826 (August 3, 2017): 363–75. http://dx.doi.org/10.1017/jfm.2017.456.

Full text

Abstract:

The distinctive pitching of hinged splitters in the trailing edge of elliptic cylinders was experimentally studied at various angles of attack ($AoA$) of the cylinder, Reynolds numbers, splitter lengths, aspect ratios ($AR$) of the cylinder and freestream turbulence levels. High-resolution telemetry and hotwire anemometry were used to characterize and gain insight on the dynamics of splitters and wake flow. Results show that the motions of the splitters contain various dominating modes, e.g. $f_{p}$ and $f_{v}$, which are induced by the mean flow and wake dynamics. High background turbulence dampens the coherence of the regular vortex shedding leading to negligible $f_{v}$. For a sufficiently long splitter, namely twice the semimajor axis of the cylinder, dual vortex shedding mode exists close to the leading and trailing edges of the splitter. In general, the splitters oscillate around an equilibrium position nearly parallel to the mean direction of the flow; however, a skewed equilibrium is also possible with a strong recirculation region. This is the case with cylinders of low $AR$ and high $AoA$, where higher lift and drag occurs. Flow measurements at various transverse locations within the wake of the cylinder–splitter system indicate that the signature of the low-frequency splitter pitching is shifted in the wake in the cases with non-zero $AoA$ of the cylinder. Although the splitter pitching exhibits two dominant vortex shedding modes in various configurations, only the higher frequency is transmitted to the wake.

APA, Harvard, Vancouver, ISO, and other styles

14

Sun, Ren, and Allen T. Chwang. "Interaction between Rotating Elliptic Cylinder and Fixed Circular Cylinder." Journal of Engineering Mechanics 125, no. 7 (July 1999): 761–67. http://dx.doi.org/10.1061/(asce)0733-9399(1999)125:7(761).

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

D’Alessio, S. J. D. "Flow past a slippery cylinder: part 2 - elliptic cylinder." Acta Mechanica 229, no. 8 (May 26, 2018): 3415–36. http://dx.doi.org/10.1007/s00707-018-2176-5.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Franek, Michal, Lenka Konecna, Oľga Hubová, and Juraj Žilinský. "Experimental Pressure Measurement on Elliptic Cylinder." Applied Mechanics and Materials 820 (January 2016): 332–37. http://dx.doi.org/10.4028/www.scientific.net/amm.820.332.

Full text

Abstract:

This paper deals with pressure measurement on the surface of the elliptic cylinder. Aerodynamic properties are not same for different shape of the building. Therefore it is important complex experimental measurement for complicated shape. Aim of the article is to understanding the wind loads on building for various arrangements. Results are external pressure coefficients of elliptic model for various rotations. Conclusion of the experiment is to find optimal and critical wind direction for isolated building. This research will be background for future work of interference effect.

APA, Harvard, Vancouver, ISO, and other styles

17

Zahedi, Mehdi M., and Mohammad Sadegh Abrishamian. "SCATTERING FROM SEMI-ELLIPTIC CHANNEL LOADED WITH IMPEDANCE ELLIPTICAL CYLINDER." Progress In Electromagnetics Research 79 (2008): 47–58. http://dx.doi.org/10.2528/pier07091803.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

Cheng, C. Y. "Natural Convection Heat and Mass Transfer From a Horizontal Cylinder of Elliptic Cross Section with Constant Wall Temperature and Concentration in Saturated Porous Media." Journal of Mechanics 22, no. 3 (September 2006): 257–61. http://dx.doi.org/10.1017/s1727719100000903.

Full text

Abstract:

AbstractThis work studies the natural convection heat and mass transfer near a horizontal cylinder of elliptic cross section with constant wall temperature and concentration in a fluid-saturated porous medium. A coordinate transformation is used to obtain the nonsimilar governing boundary layer equations. The transformed governing equations are then solved by the cubic spline collocation method. Results for the local Nusselt and Sherwood numbers are presented as functions of the Lewis number, the buoyancy ratio, and the aspect ratio when the major axis of the elliptical cylinder is vertical (slender orientation) and horizontal (blunt orientation). The heat and mass transfer rates of the elliptical cylinder with slender orientation are higher than those with blunt orientation.

APA, Harvard, Vancouver, ISO, and other styles

19

Андреев, А. К. "Метод расчета пондеромоторных сил и взаимных индуктивностей в коаксиальных осесимметричных магнитных системах." Письма в журнал технической физики 47, no. 11 (2021): 17. http://dx.doi.org/10.21883/pjtf.2021.11.51001.18729.

Full text

Abstract:

The presented method is based on the model of an axially magnetized cylinder. The power characteristics of interacting cylinders and / or coils are equivalent if their surface currents are equal. The magnetic system can be composed of cylinders and/or coils. The mutual inductances of the coils follow from the mutual energy of the cylinders, determined through the 3D fields. The fields are calculated using Bessel functions. The features of numerical calculations using the Bessel functions and elliptic integrals are discussed. It is shown that, in calculations using the Bessel functions, there are field oscillations over the end surfaces of the cylinder and local discontinuities of the force graphs appear.

APA, Harvard, Vancouver, ISO, and other styles

20

Kan, Yao, Li Chao, and Li Fang. "Electromagnetic Invisibility of Elliptic Cylinder Cloaks." Chinese Physics Letters 25, no. 5 (May 2008): 1657–60. http://dx.doi.org/10.1088/0256-307x/25/5/037.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Vasconcelos, Eloneid F., Newton T. de Oliveira, and Gil A. Farias. "Surface polaritons on an elliptic cylinder." Physical Review B 44, no. 24 (December 15, 1991): 13740–46. http://dx.doi.org/10.1103/physrevb.44.13740.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Williams, Anthony N. "Wave Forces on an Elliptic Cylinder." Journal of Waterway, Port, Coastal, and Ocean Engineering 111, no. 2 (March 1985): 433–49. http://dx.doi.org/10.1061/(asce)0733-950x(1985)111:2(433).

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

Li, Linqian, Bing Wei, Qian Yang, and Debiao Ge. "Implementation of an Approximate Conformal UPML in 2-D DGTD." International Journal of Antennas and Propagation 2017 (2017): 1–8. http://dx.doi.org/10.1155/2017/6358561.

Full text

Abstract:

Using the numerical discrete technique with unstructured grids, conformal perfectly matched layer (PML) absorbing boundary in the discontinuous Galerkin time-domain (DGTD) can be set flexibly so as to save lots of computing resources. Based on the DGTD equations in an orthogonal curvilinear coordinate system, the processes of parameter transformation for 2-D UPML between the coordinate systems of elliptical and Cartesian are given; and the expressions of transition matrix are derived. The calculation scheme of conductivity distribution in elliptic cylinder absorbing layer is given, and the calculation coefficient of DGTD in elliptic UPML is calculated. Furthermore, the 2-D iterative formulas of DGTD and that of auxiliary equation in the elliptical cylinder UPML are derived; the conformal UPML calculation in DGTD is realized. Numerical results show that very good accuracy and computational efficiency are achieved by using the method in this paper. Compared to the rectangular computational region, both the memory and computation time of conformal UPML absorbing boundary are reduced by more than 20%.

APA, Harvard, Vancouver, ISO, and other styles

24

Ren, Jia Zhi, Guo Xin Jia, and Li Bin Zhang. "Influences of Cylinder Speed-Change Mechanism Parameter for Processing Property on High-Speed Comber." Advanced Materials Research 308-310 (August 2011): 1981–87. http://dx.doi.org/10.4028/www.scientific.net/amr.308-310.1981.

Full text

Abstract:

In order to resolve the contradiction of cylinder, nipper and detaching roller in movement coordinate on high speed comber, use elliptic gear transmission make cylinder turn changeably. Use MATLAB software calculates and simulates the angular displacement, angle velocity and angle acceleration of cylinder speed change movement. Then technological parameters such as the timing of combing with cylinder speed change, and the timing of the last row of needle on cylinder through detaching roller are analyzed. The results show: cylinder transmission mechanism by the style of elliptic gear can achieve short time of cylinder combing, increase time of preparing of detaching and lapping and time of lap raise end. Meanwhile the last row of needle on cylinder passes detaching roller earlier, cylinder catches away reversed combed web from detaching roller is effectively avoided.

APA, Harvard, Vancouver, ISO, and other styles

25

Андреев, А. К. "Метод расчета взаимной индуктивности системы катушек c использованием модели аксиально намагниченного цилиндра." Письма в журнал технической физики 46, no. 21 (2020): 48. http://dx.doi.org/10.21883/pjtf.2020.21.50198.18042.

Full text

Abstract:

Proposed is a method of computing a mutual inductance of a dense winding coil system using energy of axial magnetic cylinders. Obtained formulas of computing 3-D fields of the cylinder and coils expressed in elliptic integrals. Demonstrated that an average in volume demagnetizing factor is equal to Nagaoka coefficient for self-inductance of short coils

APA, Harvard, Vancouver, ISO, and other styles

26

Sun, Ren, and Allen T. Chwang. "Interaction of a Floating Elliptic Cylinder with a Vibrating Circular Cylinder." Journal of Hydrodynamics 18, no. 4 (August 2006): 481–91. http://dx.doi.org/10.1016/s1001-6058(06)60124-8.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

GUIMBARD, D., S. LE DIZÈS, M. LE BARS, P. LE GAL, and S. LEBLANC. "Elliptic instability of a stratified fluid in a rotating cylinder." Journal of Fluid Mechanics 660 (July 16, 2010): 240–57. http://dx.doi.org/10.1017/s0022112010002636.

Full text

Abstract:

In this paper, we analyse the characteristics of the elliptic instability in a finite cylinder in the presence of both background rotation and axial stratification. A general formula for the linear growth rate of the stationary sinuous modes is derived including viscous and detuning effects in the limit of small eccentricity. This formula is discussed and compared to experimental results which are obtained in a cylinder filled with salted water for two different eccentricities by varying the stratification, the background rotation and the cylinder rotation. A good agreement with the theory concerning the domain of instability of the sinuous modes is demonstrated. Other elliptic instability modes, oscillating at the cylinder angular frequency are also evidenced together with a new type of instability mode, which could be connected to a centrifugal instability occurring during the experimental phase of spin-up. The nonlinear regime of the elliptic instability is also documented. In contrast with the homogeneous case, no cycle involving growth, breakdown and re-laminarization is observed in the presence of strong stratification. The elliptic instability in a stratified fluid seems to yield either a persistent turbulent state or a weakly nonlinear regime.

APA, Harvard, Vancouver, ISO, and other styles

28

Zhao, Yanyan, Chen Guiyun, and Zneg Lunwu. "Scattering from a topological insulator elliptic cylinder." Оптика и спектроскопия 118, no. 2 (2015): 322–26. http://dx.doi.org/10.7868/s003040341502021x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

Juncu, Gheorghe. "UNSTEADY HEAT TRANSFER INSIDE AN ELLIPTIC CYLINDER." Environmental Engineering and Management Journal 7, no. 3 (2008): 213–16. http://dx.doi.org/10.30638/eemj.2008.038.

Full text

APA, Harvard, Vancouver, ISO, and other styles

30

Leontini, Justin S., David Lo Jacono, and Mark C. Thompson. "Stability analysis of the elliptic cylinder wake." Journal of Fluid Mechanics 763 (December 16, 2014): 302–21. http://dx.doi.org/10.1017/jfm.2014.671.

Full text

Abstract:

AbstractThis paper presents the results of numerical stability analysis of the wake of an elliptical cylinder. Aspect ratios where the ellipse is longer in the streamwise direction than in the transverse direction are considered. The focus is on the dependence on the aspect ratio of the ellipse of the various bifurcations to three-dimensional flow from the two-dimensional Kármán vortex street. It is shown that the three modes present in the wake of a circular cylinder (modes A, B and QP) are present in the ellipse wake, and that in general they are all stabilized by increasing the aspect ratio of the ellipse. Two new pertinent modes are found: one long-wavelength mode with similarities to mode A, and a second that is only unstable for aspect ratios greater than approximately 1.75, which has similar spatiotemporal symmetries to mode B but has a distinct spatial structure. Results from fully three-dimensional simulations are also presented confirming the existence and growth of these two new modes in the saturated wakes.

APA, Harvard, Vancouver, ISO, and other styles

31

Khatir, B. N., M. Al-Kanhal, and A. Sebak. "Electromagnetic Wave Scattering by Elliptic Chiral Cylinder." Journal of Electromagnetic Waves and Applications 20, no. 10 (January 2006): 1377–90. http://dx.doi.org/10.1163/156939306779276866.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

MORI, Takayuki, Toshihiko TAKAHASHI, Takuya KAGA, and Terukazu OTA. "Unsteady Cavity Flow Around an Elliptic Cylinder." Transactions of the Japan Society of Mechanical Engineers Series B 63, no. 611 (1997): 2269–76. http://dx.doi.org/10.1299/kikaib.63.611_2269.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Zhao, Yanyan, Chen Guiyun, and Zneg Lunwu. "Scattering from a topological insulator elliptic cylinder." Optics and Spectroscopy 118, no. 2 (February 2015): 305–9. http://dx.doi.org/10.1134/s0030400x15020216.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Skovoroda, A. A., and E. A. Sorokina. "Geodesic Acoustic Mode in an Elliptic Cylinder." Plasma Physics Reports 44, no. 11 (November 2018): 1076–84. http://dx.doi.org/10.1134/s1063780x18110107.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Tsogkas, Georgios D., John A. Roumeliotis, and Stylianos P. Savaidis. "Scattering by an Infinite Elliptic Metallic Cylinder." Electromagnetics 27, no. 4 (May 30, 2007): 159–82. http://dx.doi.org/10.1080/02726340701272121.

Full text

APA, Harvard, Vancouver, ISO, and other styles

36

Kim, Kang, and Gerald C. Lauchle. "Acoustic intensity scattered from an elliptic cylinder." Journal of the Acoustical Society of America 109, no. 5 (May 2001): 2342. http://dx.doi.org/10.1121/1.4744231.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

Kim, Woojin, Jungil Lee, and Haecheon Choi. "Flow around a helically twisted elliptic cylinder." Physics of Fluids 28, no. 5 (May 2016): 053602. http://dx.doi.org/10.1063/1.4948247.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Sebak, A. R. "Scattering from dielectric-coated impedance elliptic cylinder." IEEE Transactions on Antennas and Propagation 48, no. 10 (2000): 1574–80. http://dx.doi.org/10.1109/8.899674.

Full text

APA, Harvard, Vancouver, ISO, and other styles

39

OTA, Terukazu, Toshihiko TAKAHASHI, Takayuki MORI, and Takuya KAGA. "Unsteady Cavitating Flow Around an Elliptic Cylinder." Transactions of the Japan Society of Mechanical Engineers Series B 62, no. 598 (1996): 2093–100. http://dx.doi.org/10.1299/kikaib.62.2093.

Full text

APA, Harvard, Vancouver, ISO, and other styles

40

Juncu, Gheorghe. "Unsteady heat transfer from an elliptic cylinder." International Journal of Heat and Mass Transfer 51, no. 3-4 (February 2008): 920–28. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2007.11.001.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Lu, H., K. B. Lua, and T. T. Lim. "Flow past a rapidly rotating elliptic cylinder." European Journal of Mechanics - B/Fluids 72 (November 2018): 676–90. http://dx.doi.org/10.1016/j.euromechflu.2018.08.011.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

Lee, S. H., and L. G. Leal. "Low-Reynolds-number flow past cylindrical bodies of arbitrary cross-sectional shape." Journal of Fluid Mechanics 164 (March 1986): 401–27. http://dx.doi.org/10.1017/s0022112086002616.

Full text

Abstract:

A numerical implementation of the method of matched asymptotic expansions is proposed to analyse two-dimensional uniform streaming flow at low Reynolds number past a straight cylinder (or cylinders) of arbitrary cross-sectional shape. General solutions for both the Stokes and Oseen equations in two dimensions are expressed in terms of a boundary distribution of fundamental single- and double-layer singularities. These general solutions are then converted to integral equations for the unknown distributions of singularity strengths by application of boundary conditions at the cylinder surface, and matching conditions between the Stokes and Oseen solutions. By solving these integral equations, using collocation methods familiar from three-dimensional application of ‘boundary integral’ methods for solutions of Stokes equation, we generate a uniformly valid approximation to the solution for the whole domain.We demonstrate the method by considering, as numerical examples, uniform flow past an elliptic cylinder, uniform flow past a cylinder of rectangular cross-section, and uniform flow past two parallel cylinders which may be either equal in radius, or of different sizes.

APA, Harvard, Vancouver, ISO, and other styles

43

Qing, De Fan, and Qing Feng Ai. "The Numerical Simulation Research on Heat Transfer Enhancement of the Interpolation-Tubular Air Pre-Heater with Semi-Elliptic Cylinder Shell Vortex Generator." Applied Mechanics and Materials 397-400 (September 2013): 230–34. http://dx.doi.org/10.4028/www.scientific.net/amm.397-400.230.

Full text

Abstract:

The semi-elliptic cylinder shell vortex generator set in the interpolation-tubular air pre-heater was studied. And by changing the high-width Ratiov, dip angleα, attack angleβ, spacingsof vortex generator to research the heat transfer and resistance properties under different working conditions, and the optimization structure of vortex generator was determined. The heating medium of the air pre-heater is the flue gas that passes across tube outside, and the cooling air as the cooling medium in the tube longitudinal scoured. The Reynolds number range is 25000 ~ 40000. The research shows that: semi-elliptic cylinder vortex generator can obviously improve the heat transfer performance, the optimization structure of the semi-elliptic cylinder vortex generator: high-width ratiov= 0.45, attack angleβ= 65 °, dip angleα= 15 °, spans= 90 mm, the heat transfer enhancement comprehensive effect raised about 43.2%~72.6%.

APA, Harvard, Vancouver, ISO, and other styles

44

Castiglia, D., S. Balabani, G. Papadakis, and M. Yianneskis. "An experimental and numerical study of the flow past elliptic cylinder arrays." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 215, no. 11 (November 1, 2001): 1287–301. http://dx.doi.org/10.1243/0954406011524658.

Full text

Abstract:

The subcritical flow over an array of elliptic cylinders with an axis ratio of 1:2 was studied both experimentally and numerically. The mean velocities, turbulence levels and the vortex dynamics of the array were determined experimentally by flow visualization and using a laser Doppler anemometer (LDA) and the flow was modelled using three-dimensional large eddy simulation (LES). The experimental results were compared with results obtained previously using circular cylinders and with numerical predictions of the flow. The study indicated that the flow past such a widely spaced array is characterized by low turbulence levels and poor lateral mixing compared with conventional circular cylinder arrays, and a weak flow periodicity with a constant Strouhal number of 0.11 was detected in downstream rows. The predicted mean and r.m.s. velocities, as well as the flow periodicity, were in good agreement with the experimental results.

APA, Harvard, Vancouver, ISO, and other styles

45

HURLEY, D. G., and G. KEADY. "The generation of internal waves by vibrating elliptic cylinders. Part 2. Approximate viscous solution." Journal of Fluid Mechanics 351 (November 25, 1997): 119–38. http://dx.doi.org/10.1017/s0022112097007039.

Full text

Abstract:

An approximate theory is given for the generation of internal gravity waves in a viscous Boussinesq fluid by the rectilinear vibrations of an elliptic cylinder. A parameter λ which is proportional to the square of the ratio of the thickness of the oscillatory boundary layer that surrounds the cylinder to a typical dimension of its cross-section is introduced. When λ[Lt ]1 (or equivalently when the Reynolds number R[Gt ]1), the viscous boundary condition at the surface of the cylinder may to first order in λ be replaced by the inviscid one. A viscous solution is proposed for the case λ[Lt ]1 in which the Fourier representation of the stream function found in Part 1 (Hurley 1997) is modified by including in the integrands a factor to account for viscous dissipation. In the limit λ→0 the proposed solution becomes the inviscid one at each point in the flow field.For ease of presentation the case of a circular cylinder of radius a is considered first and we take a to be the typical dimension of its cross-section in the definition of λ above. The accuracy of the proposed approximate solution is investigated both analytically and numerically and it is concluded that it is accurate throughout the flow field if λ is sufficiently small, except in a small region near where the characteristics touch the cylinder where viscous effects dominate.Computations indicate that the velocity on the centreline on a typical beam of waves, at a distance s along the beam from the centre of the cylinder, agrees, within about 1%, with the (constant) inviscid values provided λs/a is less than about 10−3. This result is interpreted as indicating that those viscous effects which originate from the characteristics that touch the cylinder (places where the inviscid velocity is singular) reach the centreline of the beam when λs/a is about 10−3. For larger values of s, viscous effects are significant throughout the beam and the velocity profile of the beam changes until it attains, within about 1% when λs/a is about 2, the value given by the similarity solution obtained by Thomas & Stevenson (1972). For larger values of λs/a, their similarity solution applies.In an important paper Makarov et al. (1990) give an approximate solution for the circular cylinder that is very similar to ours. However, it does not reduce to the inviscid one when the viscosity is taken to be zero.Finally it is shown that our results for a circular cylinder apply, after small modifications, to all elliptical cylinders.

APA, Harvard, Vancouver, ISO, and other styles

46

Kataoka, Yuki, Hiroaki Hasegawa, Masahide Murakami, Kazuya Seo, and Shigeru Obayashi. "Flow Behavior Caused by Air Permeability of Ski Jumping Suit Fabric." Proceedings 49, no. 1 (June 15, 2020): 109. http://dx.doi.org/10.3390/proceedings2020049109.

Full text

Abstract:

The purpose of this study was to investigate the effect of the air permeability of ski jumping suit fabric on aerodynamic characteristics. In the study, four types of fabric with different air permeabilities were installed onto a fabric-clothed elliptic cylinder, and the flow behavior around its surface was investigated through wind tunnel experiments. The stall was delayed by using the fabric with higher air permeability. The air flow permeated the surface of the elliptic cylinder through the fabric for the fabric with high air permeability. This air flowed out into the separation region through the fabric again, which suppress stall. The stall characteristics for the fabric-clothed elliptic cylinder were influenced by the air permeability of the fabric. The boundary layer thickness on the outer surface and the turbulence levels of the boundary layer affected the air permeability of the fabric. The higher air permeability fabrics improved the stall characteristics.

APA, Harvard, Vancouver, ISO, and other styles

47

Jung, Jae Hwan, and Hyun Sik Yoon. "Large eddy simulation of flow over a twisted cylinder at a subcritical Reynolds number." Journal of Fluid Mechanics 759 (October 27, 2014): 579–611. http://dx.doi.org/10.1017/jfm.2014.581.

Full text

Abstract:

AbstractWe consider a twisted cylinder that was designed by rotating the elliptic cross-section along the spanwise direction, resulting in a passive control. The flow over the twisted cylinder is investigated at a subcritical Reynolds number (Re) of 3000 using large eddy simulation based on the finite volume method. For comparison, the flow past smooth and wavy cylinders is also calculated. The twisted cylinder achieves reductions of approximately 13 and 5 % in mean drag compared with smooth and wavy cylinders, respectively. In particular, the root mean square (r.m.s.) value of the lift fluctuation of the twisted cylinder shows a substantial decrease of approximately 96 % compared with the smooth cylinder. The shear layer of the twisted cylinder covering the recirculation region is more elongated than those of the smooth and wavy cylinders, and vortex shedding from the twisted cylinder is considerably suppressed. Consequently, the elongation of the shear layer from the body and the near disappearance of vortex shedding in the near wake with weak vortical strength contributes directly to the reduction of drag and lift oscillation. Various fundamental mechanisms that affect the flow phenomena, three-dimensional separation, pressure coefficient, vortex formation length and turbulent kinetic energy are examined systematically to demonstrate the effect of the twisted cylinder surface. In addition, for the twisted cylinder at $\mathit{Re}=3000$, the effect of the cross-sectional aspect ratio is investigated from 1.25 to 2.25 to find an optimal value that can reduce the drag and lift forces. Moreover, the effect of the Reynolds number on the aerodynamic characteristics is investigated in the range of $3\times 10^{3}\leqslant \mathit{Re}\leqslant 1\times 10^{4}$. We find that as Re increases, the mean drag and the r.m.s. lift coefficient of the twisted cylinder increase, and the vortex formation length decreases.

APA, Harvard, Vancouver, ISO, and other styles

48

Hamid, A. K., and M. I. Hussein. "Electromagnetic scattering by a lossy dielectric-coated elliptic cylinder." Canadian Journal of Physics 81, no. 5 (May 1, 2003): 771–78. http://dx.doi.org/10.1139/p02-128.

Full text

Abstract:

The problem of electromagnetic wave scattering by a lossy dielectric-coated elliptic cylinder is analyzed using elliptic waves expressed in terms of complex Mathieu functions. Numerical results are obtained for the scattered field in the far zone for different axial ratios, lossy dielectric constants, and angles of incidence. The numerical results show a significant change in backscattering echo due to the lossy dielectric coating. PACS No.: 42.25.Fx

APA, Harvard, Vancouver, ISO, and other styles

49

Yue, Lei, Zhi Guo Zhang, Da Kui Feng, and Ashvinikumar V. Mudaliar. "Investigation of the Flow and Heat Transfer around Cylinders at Low Re." Advanced Materials Research 156-157 (October 2010): 1630–34. http://dx.doi.org/10.4028/www.scientific.net/amr.156-157.1630.

Full text

Abstract:

2-D computational analyses were conducted for unsteady viscous flow and heat transfer across cylinders of different geometries and different incident angle. Circular, square (both at 0° and 90° angles of incidence) and elliptic cylinders were examined. The calculations were performed by solving the unsteady 2-D Navier-Stokes equations at Re = 100. The calculated results produce drag and lift coefficients, as well as Strouhal number in excellent agreement with published data. Calculations for unsteady, incompressible 2-D flow around a square cylinder at incidence angle of 0° and 45° and for Reynolds number = 100 were carried out. Cycle independence and grid independence results were obtained for the Strouhal number. The results were in excellent agreement with the available experimental and numerical results. Numerical results show that the Strouhal number increases with fluid angle of incidence on the cylinder. The wake behind the cylinder is wider and more violent for a square cylinder at 45° incidence compared to a square at 0° this is due to the increase in the characteristic length in the flow direction. The present studywas carried out for a 2-D single cylinder at fixed location inside a channel for unidirectional velocity. To get more accurate results computation on 3-D geometry should be carried out.

APA, Harvard, Vancouver, ISO, and other styles

50

Mostafa, Mahmoud, Radwan Kamal, and Mohamed Gobran. "Flow and heat transfer characteristics around an elliptic cylinder placed in front of a curved plate." Thermal Science 18, no. 2 (2014): 465–78. http://dx.doi.org/10.2298/tsci120307054m.

Full text

Abstract:

An experimental investigation has been conducted to clarify heat transfer characteristics and flow behaviors around an elliptic cylinder. Also, flow visualization was carried out to clarify the flow patterns around the cylinder. The elliptic cylinder examined has an axis ratio of 1:2.17, was placed in the focus of parabolic plate. The test fluid is air and the Reynolds number based on the major axis length, c, ranged from 5 x 103 to 3 x 104. The angle of attack (?) was changed from 0? to 90? at 15? interval. It is found that the pressure distribution, form drag, location of separation point, and heat transfer coefficient depend strongly upon the angle of attack. Over the Reynolds number range examined, the mean heat transfer coefficient is at its highest at ? = 60? - 90?. The values of heat transfer coefficient in the case of free cylinder are higher than those for cylinder/plate combination at all angles of attack and Reynolds number range examined.

APA, Harvard, Vancouver, ISO, and other styles

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!