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首页> 外文期刊>International Journal of Heat and Mass Transfer >High Rayleigh number convection in a cubic cell with adiabatic sidewalls
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High Rayleigh number convection in a cubic cell with adiabatic sidewalls

机译：具有绝热侧壁的立方单元中的高瑞利数对流

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摘要

Turbulent Rayleigh-Benard convection in cubic cells is studied experimentally using two similar but not identical experimental setups in different laboratories. Both teams have made experiments for the same set of Prandtl and Rayleigh numbers (Pr = 3.5, Pr = 6.1, Ra = 2.0·10~9, Ra = 6.0·10~9, Ra= 1.6·10~(10)). Experiments showed that the structure of the mean flow and local characteristics of turbulent pulsations are robust and do not depend strongly on the technical details of experimental setup. Periodic low-frequency oscillations and orientations of large-scale circulation (LSC) are more sensitive to the experimental setup design. Long-time measurements using differential thermocouples revealed that preferential orientation of LSC is along of one of the diagonals, however it can deviate from exact diagonal orientation. Analyses of temperature and velocity measurements showed that dominant periodic oscillations of LSC can not be explained as simple modulation of the intensity of the large-scale diagonal flow because most intense oscillations are observed in the direction, which is orthogonal to the plane of LSC. Experimental data obtained independently by two teams can be used as a benchmark for CFD codes. Numerical simulation using a standard widely-spread CFD code was carried out. In general, on the base of overall comparison between experimental and large-eddy simulation results we concluded that for the described regimes LES gives satisfactory agreement with experiment reproducing the small-scale dynamics of the turbulent flow and the behavior of LSC.
机译：使用不同实验室中的两个相似但不完全相同的实验装置，对立方单元中的湍流瑞利-贝纳德对流进行了实验研究。两个团队都针对同一组Prandtl和Rayleigh数进行了实验（Pr = 3.5，Pr = 6.1，Ra = 2.0·10〜9，Ra = 6.0·10〜9，Ra = 1.6·10〜（10））。实验表明，平均流的结构和湍流脉动的局部特征是稳健的，并且与实验装置的技术细节无关。周期性低频振荡和大规模循环（LSC）的方向对实验装置设计更为敏感。使用差动热电偶进行的长期测量显示，LSC的优先方向沿对角线之一，但是它可能会偏离精确的对角线方向。对温度和速度测量结果的分析表明，不能将LSC的主要周期性振荡解释为对大尺度对角流强度的简单调制，因为在与LSC平面正交的方向上观察到了最强烈的振荡。由两个小组独立获得的实验数据可以用作CFD代码的基准。使用标准的广泛CFD代码进行了数值模拟。通常，在对实验和大涡模拟结果进行整体比较的基础上，我们得出结论，对于所描述的状态，LES与再现湍流和LSC行为的小规模动力学的实验给出了令人满意的一致性。

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