Relevant bibliographies by topics / Elliptic cylinder

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

Academic literature on the topic 'Elliptic cylinder'

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

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Journal articles on the topic "Elliptic cylinder"

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.

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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.
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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.

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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.
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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.

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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.
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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.

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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.
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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.

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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.
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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.

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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.
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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.

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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.
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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.

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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.
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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.

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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.
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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.

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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.
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Dissertations / Theses on the topic "Elliptic cylinder"

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Finlay, Leslie. "Hydrodynamic Stability of Free Convection from an Inclined Elliptic Cylinder." Thesis, University of Waterloo, 2006. http://hdl.handle.net/10012/2929.

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The steady problem of free convective heat transfer from an isothermal inclined elliptic cylinder and its stability is investigated. The cylinder is inclined at an arbitrary angle with the horizontal and immersed in an unbounded, viscous, incompressible fluid. It is assumed that the flow is laminar and two-dimensional and that the Boussinesq approximation is valid. The full steady Navier-Stokes and thermal energy equations are transformed to elliptical co-ordinates and an asymptotic analysis is used to find appropriate far-field conditions. A numerical scheme based on finite differences is then used to obtain numerical solutions. Results are found for small to moderate Grashof and Prandtl numbers, and varying ellipse inclinations and aspect ratios.

A linear stability analysis is performed to determine the critical Grashof number at which the flow loses stability. Comparisons are made with long-time unsteady solutions.
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Rand, Peter. "Asymptotic analysis of solutions to elliptic and parabolic problems." Doctoral thesis, Linköping : Matematiska institutionen, Linköpings universitet, 2006. http://www.bibl.liu.se/liupubl/disp/disp2006/tek1044s.pdf.

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OLIVEIRA, Laercio Gomes de. "Transferência de calor em reator cilíndrico elíptico de leito fixo: aspectos termofluidodinâmicos e geométricos." Universidade Federal de Campina Grande, 2004. http://dspace.sti.ufcg.edu.br:8080/jspui/handle/riufcg/1722.

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Submitted by Maria Medeiros (maria.dilva1@ufcg.edu.br) on 2018-09-14T12:44:26Z No. of bitstreams: 1 LAERCIO GOMES DE OLIVEIRA - TESE (PPGEP) 2004.pdf: 4405529 bytes, checksum: 8b65ffb3723d9c3b423cde424d99a1ef (MD5)
Made available in DSpace on 2018-09-14T12:44:26Z (GMT). No. of bitstreams: 1 LAERCIO GOMES DE OLIVEIRA - TESE (PPGEP) 2004.pdf: 4405529 bytes, checksum: 8b65ffb3723d9c3b423cde424d99a1ef (MD5) Previous issue date: 2004-10-08
Neste trabalho, foram desenvolvidos e apresentados vários modelos matemáticos tridimensionais analíticos e numéricos para estudar a transferência de calor no interior de um reator de leito fixo, usando condição na fronteira do sistema: de equilíbrio ou convectiva, condutividade térmica do reator constante ou variável e sistema com ou sem reação química. A modelagem matemática apresentada tem a flexibilidade de adaptar-se a leitos com forma geométrica variando desde um canal retangular até o cilindro elíptico, incluindo o cilindro circular. A metodologia numérica utilizada para resolver as equações diferenciais que representam o fenômeno físico baseia-se no método dos volumes finitos. Para discretizar a equação geral da conservação da energia foi utilizado o esquema WUDS (Weigthed Upstream Diference Scheme) como função de interpolação para os termos convectivos e difusivos e uma formulação totalmente implícita. O sistema de equações algébricas lineares resultantes da discretização da equação da energia em todos os pontos do domínio computacional é resolvido iterativamente pelo método Gauss-Seidel. Resultados da distribuição de temperatura no interior do reator em função das posições radial e angular, em várias posições ao longo do equipamento são mostradas e analisadas. Várias condições de processo foram estudadas, variando-se o coeficiente convectivo de transferência de calor, a razão de aspecto geométrica do reator, a concentração do reagente, a temperatura do fluido na entrada do sistema e a velocidade superficial do fluido. Como uma aplicação deste trabalho, os modelos matemáticos desenvolvidos foram utilizados para ajustar os dados experimentais de temperatura coletados numa célula de medidas térmicas (reator de leito fixo) de seção transversal cilíndrica circular, visando obter estimativas da condutividade térmica e coeficiente de transferência de calor do leito de partículas sob várias condições experimentais, usando-se a técnica do erro quadrático mínimo.
In this work, various analytic and numeric three-dimensional mathematical models were developed and presented to study heat transfer inside a fixed bed reactor, using a equilibrium or convective boundary condition, constant or variable thermal conductivity of the reactor and system with or without chemical reaction. The mathematical modeling presented has been the flexibility of adapting to beds with geometric shape varying from a rectangular channel to the elliptic cylinder, including the cylinder circular. The numeric methodology used to solve the differential equations that represent the physical phenomenon is based in the finite volume method. For discretize the general conservation energy equation the WUDS (Weighted Upstream Differentiates Scheme) scheme was used as interpolation function for convective and diffusive terms and a totally implicit formulation. The linear algebraic equations system resultant of the discretization of the energy equation in all points of the computational domain is iteratively solved by Gauss-Seidel method. Results of the temperature distribution inside the reactor in function of the radial and angular positions, in different positions along the equipment are shown and analyzed. Several process conditions were studied, varying the heat transfer convective coefficient, the reactor geometric aspect ration, the reagent concentration, the temperature and superficial velocity of the fluid in entrance of the system. As an application of this work, the mathematical models developed were used to adjust the temperature experimental data collected in a thermal measures cell (fixed bed reactor) of cylindrical traverse section, seeking estimate thermal conductivity and heat transfer coefficient of the particles bed under several experimental conditions, using the minimum quadratic error technique.
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Wybrow, M. F. "Oscillatory flows about elliptic and circular cylinders." Thesis, University of East Anglia, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389229.

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Paschero, Maurizio. "Improvement of the axial buckling capability of elliptical cylindrical shells." Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/26613.

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A rather thorough and novel buckling analysis of an axially-loaded orthotropic circular cylindrical shell is formulated. The analysis assumes prebuckling rotations are negligible and uses a unique re-defining of the orthotropic material properties in terms of a so-called geometric mean isotropic (GMI) material. Closed-form expressions for the buckling stress in terms of cylinder geometry and orthotropic material properties are presented, the particular closed form depending on the specific character of the orthotropic material relative to the GMI material. With the formulation, the specific character of the buckling deformations - e.g., axisymmetric or nonaxisymmetric, the number of axial and circumferential waves - can be established. By using the maximum radius of curvature of an elliptical cross section in this formulation, the analysis is used to demonstrate the detrimental effects of an elliptical cross section on axial buckling capacity when compared to a circular cross section with the same circumference. Using the circumferentially-varying radius of curvature of an elliptical cross section, the analysis is then further used as the basis for developing two methods for improving the axial buckling capacity of elliptical cylinders. The first approach involves varying the wall thickness of an isotropic elliptical cylinder with circumferential position. Uniformly stable elliptical cross sections which preserve the same critical stress, critical load, or volume of an axially loaded circular cylinder of the same circumference are designed with the formulation. The second approach involves maintaining a uniform wall thickness but varying the orthotropic material properties with circumferential position. This approach is applied to a cylindrical lattice structure where it is assumed that the ribs are dense enough to be able to describe the lattice structure by means of an equivalent homogenized material. The orthotropic properties of the homogenized material are varied by varying the lattice rib angle with circumferential position. Considerable recovery of the axial buckling capacity of the variable-rib-angle design elliptical cylinder compared to the same cylinder constructed in isogrid fashion is demonstrated. In fact, recovery relative to an isogrid circular cylinder of the same circumference is demonstrated. For both approaches confirming finite element models are used to verify the findings. The two different approaches are compared, and finally the two approaches are recognized as special cases of a more general design philosophy.
Ph. D.
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Pankratova, Iryna. "Homogenization of elliptic equations in thin cylinders and related qualitative problems." Luleå : Department of Mathematics, Luleå University of Technology, 2009. http://pure.ltu.se/ws/fbspretrieve/3359289.

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McMurray, Jennifer Marie. "Response and Failure of Internally Pressurized Elliptical Composite Cylinders." Thesis, Virginia Tech, 1999. http://hdl.handle.net/10919/79679.

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Presented is an overview of a semi-analytical solution which was developed to study the response of internally pressurized elliptical composite cylinders with clamped boundaries. Using a geometrically linear analysis and the solution scheme, the response of a quasi-isotropic elliptical cylinder is compared with the response of a quasi-isotropic circular cylinder in order to study the effects of elliptical geometry. The distinguishing features of the response of an elliptical cylinder are the inward normal displacement of the cross section at the ends of the major diameter that occur despite the outward force of the internal pressure, the presence of circumferential displacements, and the presence of inplane shear strains. These effects lead to spatial variations, including sign reversals, of a number of displacement, strain, and curvature responses. The responses of a quasi-isotropic elliptical cylinder evaluated using a geometrically linear analysis are then compared to the responses evaluated using a geometrically nonlinear analysis. It is shown that geometric nonlinearities tend to flatten certain responses at the ends of the minor diameter, and reduce the magnitude of certain responses in the boundary region. To study the influence of material orthotropy, the responses of axially-stiff and circumferentially-stiff elliptical cylinders evaluated using geometrically nonlinear analyses are examined. It is shown that in some instances material orthotropy can be used to mitigate the influence of the elliptical geometry and make particular responses look like those of a circular cylinder. An evaluation of failure using the maximum stress and Hashin failure criteria and geometrically linear and nonlinear analyses is presented for elliptical cylinders. These failure criteria involve interlaminar shear stresses which are computed by integrating the equilibrium equations of elasticity through the thickness of the cylinder wall. The failure criteria are used to assess the mode of failure (e.g., tensile or compressive fiber or matrix modes), the location of failure, and the pressure at failure. Both criteria predict first failure to occur at the clamped boundaries because of matrix cracking. The predicted failure pressures and circumferential locations are very similar for the two criteria, and the nonlinear analyses predict slightly higher pressures at somewhat different circumferential locations. First fiber failure is also considered. For this failure the two criteria predict similar failure scenarios for the linear analyses, but they differ in their predictions for the nonlinear analyses. Specifically, using the maximum stress criterion, the circumferentially-stiff elliptical cylinder is predicted to fail due to fiber compression, but the Hashin criterion predicts failure to be due to fiber tension, and at a different circumferential location. Also, first fiber failure pressures are at least a factor of two greater than the first matrix failure pressure.
Master of Science
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Haynie, Waddy. "Torsion of Elliptical Composite Cylindrical Shells." Diss., Virginia Tech, 2007. http://hdl.handle.net/10919/28547.

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The response of elliptical composite cylindrical shells under torsion is studied. The torsional condition is developed by rotating one end of the cylinder relative to the other. Prebuckling, buckling, and postbuckling responses are examined, and material failure is considered. Four elliptical cross sections, defined by their aspect ratio, the ratio of minor to major radii, are considered: 1.00 (circular), 0.85, 0.70, and 0.55. Two overall cylinder sizes are studied; a small size with a radius and length for the circular cylinder of 4.28 in. and 12.85 in., respectively, and a large size with radii and lengths five times larger, and thicknesses two times larger than the small cylinders. The radii of the elliptical cylinders are determined so the circumference is the same for all cylinders of a given size. For each elliptical cylinder, two lengths are considered. One length is equal to the length of the circular cylinder, and the other length has a sensitivity of the buckling twist to changes in the length-to-radius ratio the same as the circular cylinder. A quasi-isotropic lamination sequence of a medium-modulus graphite-epoxy composite material is assumed. The STAGS finite element code is used to obtain numerical results. The geometrically-nonlinear static and transient, eigenvalue, and progressive failure analysis options in the code are employed. Generally, the buckling twist and resulting torque decrease with decreasing aspect ratio. Due to material anisotropy, the buckling values are generally smaller for a negative twist than a positive twist. Relative to the buckling torque, cylinders with aspect ratios of 1.00 and 0.85 show little or no increase in capacity in the postbuckling range, while cylinders with aspect ratios of 0.70 and 0.55 show an increase. Postbuckling shapes are characterized by wave-like deformations, with ridges and valleys forming a helical pattern due to the nature of loading. The amplitudes of the deformations are dependent on cross-sectional geometry. Some elliptical cylinders develop wave-like deformations prior to buckling. Instabilities in the postbuckling range result in shape changes and loss of torque capacity. Material failure occurs on ridges and in valleys. Cylinder size and cross-sectional geometry influence the initiation and progression of failure.
Ph. D.
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Meyers, Carol Ann. "An analytical and experimental investigation of the response of elliptical composite cylinders." Diss., This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-10052007-143144/.

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Sun, Miao. "Use of Material Tailoring to Improve Axial Load Capacity of Elliptical Composite Cylinders." Diss., Virginia Tech, 2006. http://hdl.handle.net/10919/29693.

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This study focuses on the improvement of the axial buckling capacity of elliptical composite cylinders through the use of a circumferentially-varying lamination sequence. The concept of varying the lamination sequence around the circumference is considered as a viable approach for off-setting the disadvantages of having the cylinder radius of curvature vary with circumferential position, the source of the reduced buckling capacity when compared to a circular cylinder with the same circumference. Post-buckling collapse behavior and material failure characteristics are also of interest. Two approaches to implementing a circumferential variation of lamination are examined. For the first approach the lamination sequence is varied in a stepwise fashion around the circumference. Specifically, each quadrant of the cylinder circumference is divided into three equal-length regions denoted as the crown, middle, and side regions. Eight different cylinders designs, whereby each region is constructed of either a quasi-isotropic or an axially-stiff laminate of equal thickness, are studied. Results are compared to the baseline case of an elliptical cylinder constructed entirely of a quasi-isotropic laminate. Since the thickness of the quasi-isotropic and axially-stiff laminates are the same, all cylinders weight the same and thus comparisons are meaningful. Improvements upwards of 18% in axial buckling capacity can be achieved with one particular stepwise design. The second approach considers laminations that vary circumferentially in a continuous fashion to mitigate the effects of the continuously-varying radius of curvature. The methodology for determining how to tailor the lamination sequence circumferentially is based on the analytical predictions of a simple buckling analysis for simply-supported circular cylinders. With this approach, axial buckling load improvements upwards of 30% are realized. Of all the cylinders considered, very few do not exhibit material failure upon collapse in the post-buckled state. Of those that do not, there is little, if any, improvement in bucking capacity. Results for the pre-buckling, buckling, post-buckling, and material failure are obtained from the finite-element code ABAQUS using both static and dynamic analyses. Studies with the code demonstrate that the results obtained are converged.
Ph. D.
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Books on the topic "Elliptic cylinder"

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Chaplin, J. R. Loading on a cylinder in uniform elliptical orbital flow. London: City University, 1985.

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Book chapters on the topic "Elliptic cylinder"

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Kozlov, V., V. Maz’ya, and J. Rossmann. "Elliptic boundary value problems in an infinite cylinder." In Mathematical Surveys and Monographs, 145–89. Providence, Rhode Island: American Mathematical Society, 2002. http://dx.doi.org/10.1090/surv/052/05.

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Maniyeri, Ranjith. "Numerical Simulation of Viscous Flow Past Elliptic Cylinder." In Lecture Notes in Mechanical Engineering, 429–34. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-2697-4_46.

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Young, Stewart, Vladimir Pekar, Jürgen Weese, Thomas Netsch, and Arianne van Muiswinkel. "Model-based vessel segmentation using an elliptic cylinder." In CARS 2002 Computer Assisted Radiology and Surgery, 923–27. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-642-56168-9_154.

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Young, Peter J. S. "Wake Topology for Steady Flow Past an Inclined Elliptic Cylinder." In Springer Proceedings in Mathematics & Statistics, 533–39. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-12307-3_76.

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Mao, Shi-Chun, Fan Wang, and Zhen-Sen Wu. "Research on Scattering of Weekly Lossy Homogeneous Gyrotropic Elliptic Cylinder." In Lecture Notes in Electrical Engineering, 19–23. London: Springer London, 2012. http://dx.doi.org/10.1007/978-1-4471-4790-9_3.

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Kamel, A., and E. Niver. "Scattering by a Perfect Conducting Elliptic Cylinder Immersed Halfway Between Two Half Spaces." In Springer Proceedings in Physics, 97–103. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/3-540-30636-6_10.

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Zhang, Wenbin, and Liyong Zou. "Wave Patterns in the Interaction of an Incident Shock with an Elliptic Gas Cylinder." In 31st International Symposium on Shock Waves 1, 637–44. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-91020-8_75.

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Maz’ya, Vladimir, Serguei Nazarov, and Boris A. Plamenevskij. "Elliptic Boundary Value Problems in Domains with Smooth Boundaries, in a Cylinder, and in Domains with Cone Vertices." In Asymptotic Theory of Elliptic Boundary Value Problems in Singularly Perturbed Domains, 79–114. Basel: Birkhäuser Basel, 2000. http://dx.doi.org/10.1007/978-3-0348-8434-1_3.

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Tezuka, Asei, and Kojiro Suzuki. "Global Stability Analysis of Two-Dimensional Incompressible Flows around an Elliptic Cylinder at Various Incidences." In Computational Fluid Dynamics 2000, 775–76. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-642-56535-9_124.

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Volpert, Vitaly. "Problems in Cylinders." In Elliptic Partial Differential Equations, 359–400. Basel: Springer Basel, 2011. http://dx.doi.org/10.1007/978-3-0346-0537-3_9.

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Conference papers on the topic "Elliptic cylinder"

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BLODGETT, K., K. GHIA, G. OSSWALD, and U. GHIA. "Unsteady separated flow past an elliptic cylinder." In 1st National Fluid Dynamics Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1988. http://dx.doi.org/10.2514/6.1988-3607.

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Mann, Stephen, Sanjeev Bedi, and David Roth. "The swept surface of an elliptic cylinder." In the sixth ACM symposium. New York, New York, USA: ACM Press, 2001. http://dx.doi.org/10.1145/376957.376992.

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TSOGKAS, GEORGIOS D., JOHN A. ROUMELIOTIS, and STYLIANOS P. SAVAIDIS. "SCATTERING BY AN INFINITE ELLIPTIC METALLIC CYLINDER." In Proceedings of the Seventh International Workshop. WORLD SCIENTIFIC, 2006. http://dx.doi.org/10.1142/9789812773197_0008.

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TSOGKAS, GEORGIOS D., JOHN A. ROUMELIOTIS, and STYLIANOS P. SAVAIDIS. "SCATTERING BY AN INFINITE ELLIPTIC DIELECTRIC CYLINDER." In Proceedings of the 8th International Workshop on Mathematical Methods in Scattering Theory and Biomedical Engineering. WORLD SCIENTIFIC, 2008. http://dx.doi.org/10.1142/9789812814852_0011.

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Akgol, Oguzhan, Danilo Erricolo, Piergiorgio L. E. Uslenghi, Daniele Monopoli, and Riccardo E. Zich. "Electromagnetic scattering by an elliptic DNG metamaterial cylinder." In 2009 International Conference on Electromagnetics in Advanced Applications (ICEAA). IEEE, 2009. http://dx.doi.org/10.1109/iceaa.2009.5297343.

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Hussein, M., A. Sebak, and M. Hamid. "Scattering by a perfectly conducting slotted elliptic cylinder." In 1992 Symposium on Antenna Technology and Applied Electromagnetics. IEEE, 1992. http://dx.doi.org/10.1109/antem.1992.7854249.

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Naik, Sandeep N., S. Vengadesan, and K. Arul. "Flow Past Rotating Low Axis Ratio Elliptic Cylinder." In 46th AIAA Fluid Dynamics Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2016. http://dx.doi.org/10.2514/6.2016-4348.

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Peng, Yaling, Zhiguo Zhang, Fangliang Wu, and Dakui Feng. "Unsteady Numerical Analysis of Flow Across 2D Cylinder." In ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/omae2010-20884.

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Abstract:
2-D computational analyses were conducted for unsteady viscous flow across cylinders of different geometries and different incident angle. Circular, square and elliptic (both at 0° and 90° angles of incidence) cylinders were examined. The calculations were performed by solving the unsteady 2-D Navier-Stokes equation 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 2D 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 Strouhal number is highest for elliptic geometry among all cylinders in this research. For the geometries elliptic at 0° at Re = 100, there is not vortex shedding behind the cylinder. This is due to dominance of inertia forces over viscous forces. The present study was 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.
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Kim, Moon-Sang, Young-Bin Park, and Yeong-Taek Lim. "Parametric Study of Unsteady Viscous Flow over Elliptic Cylinder." In 44th AIAA Aerospace Sciences Meeting and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2006. http://dx.doi.org/10.2514/6.2006-1398.

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Hamid, A.-K. "Scattering by PEMC elliptic cylinder loaded by metamaterial coating." In 2011 IEEE Jordan Conference on Applied Electrical Engineering and Computing Technologies (AEECT). IEEE, 2011. http://dx.doi.org/10.1109/aeect.2011.6132502.

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Reports on the topic "Elliptic cylinder"

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Martineau, R., and C. Romero. Response of a stainless steel cylinder with elliptical ends subjected to an off-center blast load. Office of Scientific and Technical Information (OSTI), June 1996. http://dx.doi.org/10.2172/244679.

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