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首页> 外文会议>AIAA computational fluid dynamics conference;AIAA aviation forum >Impact of Computational Domain Size in Simulations of Homogeneous Decaying Turbulence and Mixing Layers
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Impact of Computational Domain Size in Simulations of Homogeneous Decaying Turbulence and Mixing Layers

机译：计算域大小对均相衰减湍流和混合层模拟的影响

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An effective simulation of homogeneous decaying turbulence (HDT) or a turbulent mixing layer (TML) requires a computational domain which is larger than the integral length scale such that the turbulent length scales are not constrained. This paper investigates for two fundamental flows the point at which the size of the computational domain impacts the accuracy of the simulation. It is shown through simulations from 64~3 - 1024~3 that for HDT the prediction of integral lengths becomes inaccurate as it approaches 10% of the box size, however kinetic energy is reasonably predicted with even just one or two modes at low wavenumbers. For the TML, the key errors arise from the lack of statistical averaging and truncation of the layer rather than a direct impact of the box size on the flow physics.
机译：有效的均质衰减湍流（HDT）或湍流混合层（TML）的模拟需要一个计算域，该域要大于积分长度尺度，以使湍流尺度不受约束。本文研究了两个基本流程，即计算域的大小影响仿真精度的点。通过从64〜3-1024〜3的模拟可以看出，对于HDT，积分长度的预测在接近盒大小的10％时变得不准确，但是即使在低波数下甚至只有一种或两种模式，也可以合理地预测动能。对于TML，关键错误是由于缺少统计平均层和截断层而不是框大小对流物理学的直接影响而引起的。

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