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An implicit finite element solution of thermal flows at low Mach number

机译:低马赫数热流的隐式有限元解

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Thermal flows at low Mach numbers are a basic problem in combustion, environmental pollution prediction and atmospheric physics areas. Most of the existing schemes for solving this problem treat convection explicitly, which confines time step width due to the CFL condition. In this paper, based on the pseudo residual-free bubble approach [F. Brezzi, L.P. Franca, T.J.R. Hughes, A. Russo, b = integral g, Methods Appl. Mech. Eng. 145 (1997) 329-339; T.J.R. Hughes, Multiscale phenomena: Green's functions, the Dirichlet-to-Neumann formulation, subgrid scale models, bubbles and the origins of stabilised methods, Method. Appl. Mech. Eng. 127 (1995) 387-401], we introduce an implicit finite element scheme for the thermal flow problem. We firstly give a low Mach number asymptotics of compressible Navier-Stokes equations for the thermal flows and then derive the numerical scheme for them in detail. Three representative case studies are used to investigate and to test the numerical performances of the proposed scheme. (c) 2007 Elsevier Inc. All rights reserved.
机译:马赫数低的热流是燃烧,环境污染预测和大气物理领域的基本问题。解决该问题的大多数现有方案都明确地对流处理,这由于CFL条件而限制了时间步长。本文基于伪无残留气泡法[F. Brezzi,L.P. Franca,T.J.R. Hughes,A。Russo,b =积分g,方法应用。机甲。 145(1997)329-339;杰瑞休斯,多尺度现象:格林函数,Dirichlet-to-Neumann公式,子网格尺度模型,气泡和稳定方法的起源,方法。应用机甲。 127(1995)387-401],我们为热流问题引入了隐式有限元方案。我们首先给出热流的可压缩Navier-Stokes方程的低马赫数渐近性,然后详细推导它们的数值方案。使用三个代表性案例研究来研究和测试所提出方案的数值性能。 (c)2007 Elsevier Inc.保留所有权利。

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