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排序方式: 共有160条查询结果,搜索用时 31 毫秒
31.
IntroductionShallowwaterflowexistsverywidelyinhydraulicengineering .Pollutantdiffusionthatismainlycontrolledbytheshallowwaterflowhasbroughtincreasinglyattentioninenvironmentalengineering.Thetwo_dimensionalmodelfordescribingtheflowcharacteristicshasbee… 相似文献
32.
33.
B. M. Argrow 《Shock Waves》1996,6(4):241-248
Nonclassical phenomena associated with the classical dynamics of real gases in a conventional shock tube are studied. A TVD
predictor-corrector (TVD-MacCormack) scheme with reflective endwall boundary conditions is used for the one-dimensional Euler
equations to simulate the evolution of the wave field of a van der Waals gas. Depending upon the initial conditions of the
gas, wave fields are produced that contain nonclassical phenomena such as expansion shocks, composite waves, splitting shocks,
etc. In addition, the interactions of waves reflected from the endwalls produce both classical and nonclassical phenomena.
Wave field evolution is depicted using plots of the flow variables at specific times and withx-t diagrams. 相似文献
34.
L. Corrêa G.A. B. Lima M.A. C. Candezano M.P. S. Braun C.M. Oishi H.A. Navarro V.G. Ferreira 《国际流体数值方法杂志》2013,72(12):1263-1285
A bounded upwinding scheme for numerical solution of hyperbolic conservation laws and Navier–Stokes equations is presented. The scheme is based on convection boundedness criterion and total variation diminishing stability criteria and developed by employing continuously differentiable functions. The accuracy of the scheme is verified by assessing the error and observed convergence rate on 1‐D benchmark test cases. A comparative study between the new scheme and conventional total variation diminishing/convection boundedness criterion‐based upwind schemes to solve standard nonlinear hyperbolic conservation laws is also accomplished. The scheme is then examined in the simulation of Newtonian and non‐Newtonian fluid flows of increasing complexity; a satisfactory agreement has been observed in terms of the overall behavior. Finally, the scheme is used to study the hydrodynamics of a gas‐solid flow in a bubbling fluidized bed. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献
35.
We propose a new model and a solution method for two‐phase two‐fluid compressible flows. The model involves six equations obtained from conservation principles applied to a one‐dimensional flow of gas and liquid mixture completed by additional closure governing equations. The model is valid for pure fluids as well as for fluid mixtures. The system of partial differential equations with source terms is hyperbolic and has conservative form. Hyperbolicity is obtained using the principles of extended thermodynamics. Features of the model include the existence of real eigenvalues and a complete set of independent eigenvectors. Its numerical solution poses several difficulties. The model possesses a large number of acoustic and convective waves and it is not easy to upwind all of these accurately and simply. In this paper we use relatively modern shock‐capturing methods of a centred‐type such as the total variation diminishing (TVD) slope limiter centre (SLIC) scheme which solve these problems in a simple way and with good accuracy. Several numerical test problems are displayed in order to highlight the efficiency of the study we propose. The scheme provides reliable results, is able to compute strong shock waves and deals with complex equations of state. Copyright © 2006 John Wiley & Sons, Ltd. 相似文献
36.
Approximating convection-dominated diffusion equations requires a very accurate scheme for the convection term. The most famous is the method of backward characteristics, which is very precise when a good interpolation procedure is used. However, this method is difficult to implement in 2D or 3D. The goal of this paper is to show that it is possible to construct finite difference schemes almost as accurate as the method of characteristics. Starting from a family of second- and third- order Lax–Wendroff-type schemes, a TVD and L∞- stable scheme that is easy to implement in higher dimensions is constructed. Numerical tests are performed on various model problems whose solution is known and on classical problems. Comparisons with some other limiter schemes and the method of characteristics are discussed. © 1997 by John Wiley & Sons, Ltd. 相似文献
37.
TVD格式是目前数值研究以激波为主要特征之一的超声速、高超声速流场的最先进的算法之一。本文用二阶迎风TVD格式,对三种烧蚀外形的轴对称粘性流场和10°钝锥有攻角三维粘性流场进行了数值模拟,得到了高质量的头部脱体激波和与实验结果及直线推进法计算一致的物面压力分布,表明了TVD格式在再入体粘性绕流计算中的独特优势。 相似文献
38.
39.
张涵信 《应用数学和力学(英文版)》1991,12(1):107-112
An implicit,non-oscillatory.containing no free parameter and dissipative(INND)scheme solving.Navier Stokes equations is developed.This scheme is one of total variationdiminishing(TVD)algorithms.The results show that this scheme is applicable for solvingNavier Stokes equations,and that the shock-capturing capabilbility and the convergencerate are satisfactory. 相似文献
40.
In this work we present an upwind‐based high resolution scheme using flux limiters. Based on the direction of flow we choose the smoothness parameter in such a way that it leads to a truly upwind scheme without losing total variation diminishing (TVD) property for hyperbolic linear systems where characteristic values can be of either sign. Here we present and justify the choice of smoothness parameters. The numerical flux function of a high resolution scheme is constructed using wave speed splitting so that it results into a scheme that truly respects the physical hyperbolicity property. Bounds are given for limiter functions to satisfy TVD property. The proposed scheme is extended for non‐linear problems by using the framework of relaxation system that converts a non‐linear conservation law into a system of linear convection equations with a non‐linear source term. The characteristic speed of relaxation system is chosen locally on three point stencil of grid. This obtained relaxation system is solved using composite scheme technique, i.e. using a combination of proposed scheme with the conservative non‐standard finite difference scheme. Presented numerical results show higher resolution near discontinuity without introducing spurious oscillations. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献