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文摘
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借助于Level Set函数,建立了气-液两相的统一控制方程组,并在交错网格中进行离散.用两种格式,即Superbee-TVD格式和5阶WENO格式求解Level Set函数的输运方程,用SIMPLER算法的思想对主流场控制方程的求解方法进行改进.数值实验结果表明,在求解Level Set的控制方程时,5阶WENO方法比Superbee-TVD格式的结果更准确;用改进的数值算法可成功实现对密度比大于1 000/1的气-液两相流界面迁移问题的数值模拟.对几种典型大密度比气-液两相流问题的计算结果与实际问题的物理规律完全一致,验证了该方法的有效性和可靠性. |
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其他语种文摘
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General governing equations are established for the whole two-phase flow field with the help of a level set function. The equations are discretized by finite difference method in a staggered Cartesian grid system. Two schemes, i.e. the Superbee-total variation dimishing(TVD) scheme and 5-order weighted es-sentially non-oscillatory(WENO) scheme are adopted to solve the advection equation of the Level Set func-tion, and a SIMPLER-based method is employed to seek solutions to the momentum equations of the two-phase flow. The numerical results show that the 5-order WENO scheme is much more effective than the Superbee-TVD scheme when applied to the computation of the Level Set equation, and the presented nu-merical method is suitable for the solution to gas-liquid two-phase flows with a liquid-gas density ratio lar-ger than 1 000/1. Computations of several typical gas-liquid two-phase problems of large liquid-gas density ratios show that the numerical simulation can reasonably revealed the physical mechanisms and the method is quite promising in simulating the behaviors of moving interfaces in gas-liquid two-phase flows. |
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来源
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西安交通大学学报
,2004,38(11):1123-1127 【核心库】
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关键词
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Level Set方法
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气-液两相流
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数值模拟
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地址
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1.
西安交通大学, 动力工程多相流国家重点实验室, 西安, 710049
2.
中科院力学所, 国家微重力实验室, 北京, 100080
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0253-987X |
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学科
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能源与动力工程 |
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基金
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国家自然科学基金资助项目
;
中国核动力研究设计院空泡物理和自然循环国家重点实验室基金
;
中国科学院力学研究所国家微重力实验室开放基金
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文献收藏号
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CSCD:1646710
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