高精度DG方法用于Rayleigh-Benard自然对流问题计算分析
首发时间:2013-01-16
摘要:Rayleigh-Banard自然对流由于其流动机理的复杂性及强源项的特性,给精确模拟此类问题带来一定困难。本文使用预处理间断有限元方法求解封闭方腔内的Rayleigh-Banard自然对流,一阶精度和二阶精度计算结果表明:一阶精度的计算不能有效捕捉Rayleigh-Benard自然对流的非稳定性,需二阶精度及以上的计算。有限体积及间断有限元结果对比表明:预处理间断有限元使用理想气体模型能非常有效的模拟极低Ma数下的封闭方腔内自然对流,且预处理间断有限元方法有望更准确的模拟低Ma数的流动及传热,该方法对Rayleigh-Benard自然对流问题的计算有广泛的应用前景。
关键词: 间断有限元 预处理方法 Rayleigh-Benard自然对流
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Precondition Discontinuous Galerkin Method For Rayleigh-Benard Flow
Abstract:As the complexity of the flow mechanism and bouyancy source term,the Rayleigh-Benard Natural Convection is hard to simulate accurately. In this paper, the preconditioning discontinuous galerkin method is induced to calculate the Rayleigh-Benard natrual convection. First-order and second-order's results show that second-order accuracy or higher is needed in order to capture the instability of the Rayleigh-Benard natrual convection. The results of finite volume method and discontinuous galerkin methods show that the discontinuous galerkin method can effective simulate the natrual convection using the full bouyancy modal. And the results also indicate the discontinuous galerkin method can get a more accuracy result than finite volume method,and with broad prospects to simulate the natrual convection.
Keywords: Discontinuous Galerkin Method, Precondition Method, Rayleigh-Benard natrual convection
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高精度DG方法用于Rayleigh-Benard自然对流问题计算分析
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