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首页> 外文期刊>Fusion Engineering and Design >Direct numerical simulation of MHD heat transfer in high Reynolds number turbulent channel flows for Prandtl number of 25
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Direct numerical simulation of MHD heat transfer in high Reynolds number turbulent channel flows for Prandtl number of 25

机译：Prandtl数为25的高雷诺数湍流通道中MHD传热的直接数值模拟

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摘要

The high-Prandtl number passive scalar transport of the turbulent channel flow imposed a wall-normal magnetic field is investigated through the large-scale direct numerical simulation (DNS). All essential turbulence scales of velocities and temperature are resolved by using 2048 × 870 × 1024 computational grid points in stream, vertical, and spanwise directions. The heat transfer phenomena fora Prandtl number of 25 were observed under the following flow conditions: the bulk Reynolds number of 14,000 and Hartman number of up to 28. These values were equivalent to the typical nondimensional parameters of the fusion blanket design proposed by Wong et al. As a result, a high-accuracy DNS database for the verification of magnetohydrodynamic turbulent heat transfer models was established for the first time, and it was confirmed that the heat transfer correlation for a Prandtl number of 5.25 proposed by Yamamoto and Kunugi was applicable to the Prandtl number of 25 used in this study.
机译：通过大规模直接数值模拟（DNS）研究了湍流通道流在壁法向磁场中的高普朗特数被动标量传输。通过使用流，垂直和展向方向上的2048×870×1024计算网格点，可以解决所有基本的速度和温度湍流尺度。在以下流动条件下观察到传热现象的Prandtl数为25：雷诺数为14,000，哈特曼数高达28。这些值等于Wong等人提出的融合毯设计的典型无量纲参数。结果，首次建立了用于验证磁流体动力湍流传热模型的高精度DNS数据库，并确认了Yamamoto和Kunugi提出的5.25的Prandtl数的传热相关性适用于磁流体动力学湍流传热模型。本研究中使用的Prandtl数为25。

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