نتایج جستجو برای: compressible viscous flow

تعداد نتایج: 500342  

2000
M. Vázquez G. Houzeaux R. Codina

In this paper, some ideas for solving Navier-Stokes equations using fractional step techniques in combination with domain decomposition methods are introduced. Apart from its traditional use in a rational distribution of the computational work, the domain decomposition (DD) method can be a powerful tool when dealing with complex geometries, which can have moving parts. The CBS (Characteristic B...

2009
Chunlei Liang Sachin Premasuthan Antony Jameson

0045-7949/$ see front matter Published by Elsevier doi:10.1016/j.compstruc.2008.12.016 * Corresponding author. Tel.: +1 650 724 5479. E-mail address: [email protected] (C. Liang). This paper reports development of a two-dimensional solver for compressible viscous flow using spectral difference (SD) method and its applications on simulating laminar flow past two side-by-side cylinders at vari...

2004
Dan MATEESCU

This invited paper presents efficient solutions of the Euler and Navier-Stokes equations based on finite difference and finite volume formulations. They were obtained with several methods recently developed for the efficient analysis of steady and unsteady external flows. (i) A biased-flux method based on an explicit finite volume formulation is first presented for the solution of the Euler equ...

Journal: :The Journal of the Acoustical Society of America 2010
Dorel Homentcovschi Ronald N Miles

A model of squeeze-film behavior is developed based on Stokes' equations for viscous, compressible isothermal flows. The flow domain is an axisymmetrical, unit cell approximation of a planar, periodic, perforated microstructure. The model is developed for cases when the lubrication approximation cannot be applied. The complex force generated by vibrations of the diaphragm driving the flow has t...

2003
Quanhua Sun Iain D. Boyd

Flow over micro-scale airfoils is investigated in order to understand the aerodynamic issues related to micro air vehicle design and performance. Studies have shown that such low Reynolds number flow exhibits rarefied phenomena and a flat plate having a thickness ratio of 5% has better aerodynamic performance than conventional streamlined airfoils. This paper simulates gas flows over a 5% flat ...

2010
C. Biotto J. Peiró

We present a CFD zonal solver which efficiently simulates compressible viscous flows by reducing the computational cost through the use of a lower fidelity model, the Euler equations of inviscid flow, in regions where the flow is not dominated by viscous effects. This strategy also guarantees an acceptable level of accuracy. The design process can be accelerated if adequate solvers are used wit...

Journal: :SIAM J. Scientific Computing 2004
Kun Xu

This paper is about the construction of a BGK Navier–Stokes (BGK-NS) solver in the discontinuous Galerkin (DG) framework. Since in the DG formulation the conservative variables and their slopes can be updated simultaneously, the flow evolution in each element involves only the flow variables in the nearest neighboring cells. Instead of using the semidiscrete approach in the Runge–Kutta disconti...

2013
Kung-Ming Chung Po-Hsiung Chang Keh-Chin Chang

A flap can be used as a high-lift device, in which a downward deflection results in a gain in lift at a given geometric angle of attack. To characterize the aerodynamic performance of a deflected surface in compressible flows, the present study examines a naturally developed turbulent boundary layer past the convex and concave corners. This investigation involves the analysis of mean and fluctu...

1998
Semyon Tsynkov Saul Abarbanel Jan Nordström SEMYON TSYNKOV VEER VATSA

We propose new global artificial boundary conditions (ABC’s) for computation of flows with propulsive jets. The algorithm is based on application of the difference potentials method (DPM). Previously, similar boundary conditions have been implemented for calculation of external compressible viscous flows around finite bodies. The proposed modification substantially extends the applicability ran...

Journal: :journal of computational & applied research in mechanical engineering (jcarme) 2012
gh. payganeh a. hadidi m. hallaji n. garjasi

over the last ten years, robustness of schemes has raised an increasing interest among the cfd community. the objective of this article is to solve the quasi-one-dimensional compressible flow inside a “shubin nozzle” and to investigate bean-warming and flux vector splitting methods for numerical solution of compressible flows. two different conditions have been considered: first, there is a sup...

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