A numerical study on the non-Boussinesq effect in the natural convection in horizontal annulus

A numerical study on the non-Boussinesq effect in the natural convection in horizontal annulus
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水平环空自然对流非布辛涅斯克效应的数值研究

DOI:
10.1063/1.5010864
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发表时间:
2018-03
期刊:
影响因子:
4.6
通讯作者:
Yuhui Cao
Yuhui Cao
中科院分区:
工程技术2区
文献类型:
--
作者:
Yu Zhang;Yuhui Cao

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本文采用变物性格子Boltzmann通量求解器对空气填充水平同心圆环内热对流中的非Boussinesq效应进行了数值研究,径向温差比为1.0,半径比为2.0,瑞利数为10~4≤Ra≤~(10~6)。通过使用标准形式或简化形式的VPLBFS,可以得到几种解,包括考虑流体性质全部变化的实数解(VPS)、基于Boussinesq近似的常物性解(CPS)、变动态粘度(VVS)解、基于部分Boussinesq近似(PBAS)的解(PBAS)、变导热系数(VCS)解(VCS)和变流体密度解(VDS)。分析了这些解之间的差异,以说明部分或全部v引起的非Boussinesq效应的影响。
In the present study, the non-Boussinesq effect in the thermal convection in an air-filled horizontal concentric annulus is studied numerically by using the variable property-based lattice Boltzmann flux solver (VPLBFS), with the radial temperature difference ratio of 1.0, the radius ratio of 2.0, and the Rayleigh number in the range 104 ≤ Ra ≤ 106. Several solutions are obtained by using the standard form or simplified versions of the VPLBFS, including the real solution with the total variation in fluid properties considered, named as the variable property solution (VPS), the constant property solution (CPS) based on the Boussinesq approximation, the solution with variable dynamic viscosity (VVS), the solution based on the partial Boussinesq approximation (PBAS), the solution with variable thermal conductivity (VCS) and the solution with variable fluid density (VDS). The discrepancy between these solutions is analyzed to illuminate the influence of the non-Boussinesq effects induced by partial or total v...
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影响因子: --
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