An improved decoupling algorithm for low Mach number near-critical fluids

An improved decoupling algorithm for low Mach number near-critical fluids
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低马赫数近临界流体的改进解耦算法

DOI:
10.1016/j.compfluid.2016.12.009
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发表时间:
2017-03
期刊:
影响因子:
2.8
通讯作者:
Xin-Rong Zhang
Xin-Rong Zhang
中科院分区:
工程技术3区
文献类型:
--
作者:
Zhan-Chao Hu;Xin-Rong Zhang

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本文提出了一种改进的低马赫数近临界流体流动的解耦算法。该算法采用能量方程的p-形式(不采用定压比热),通过块耦合方法处理压力-速度耦合,并对连续性方程进行了变换。通过一个二维近临界CO2 Rayleigh-Bénard对流问题验证了该算法的有效性.通过对不同加热强度下热边界层的稳定性行为和温度场的典型演化过程的分析,验证了网格独立性和时间步长独立性的正确性。改进后的解耦算法具有更好的稳定性,并能进一步减少CPU时间。当流动以对流为主时,这些优点甚至更加明显。
This paper describes an improved decoupling algorithm for calculating low Mach number near-critical fluid flows, in which thecp-formulation of the energy equation is used (cprefers to the specific heat at constant pressure) and the pressure–velocity coupling is treated through the block-coupled method, together with a transformation of the continuity equation. The algorithm is validated by a 2D near-critical CO2Rayleigh–Bénard convection problem. After the mesh and time step independence studies, the correctness is presented through the stability behaviors of the hot boundary layer under different heating intensities and the typical evolution of the temperature field. The improved decoupling algorithm owns a better stability and can further reduce the CPU time. The advantages are even more obvious when the flow is convection-dominated.
DOI: 10.1063/1.869738
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影响因子: 4.6
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