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arXiv 1607.01042physics.flu-dyn
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用人工神经网络搜索turbulence模型

Searching for turbulence models by artificial neural network

Masataka Gamahara, Yuji Hattori

摘要:

将人工神经网络(ANN)用于寻找新的亚网格应力模型,并应用于大涡模拟。人工神经网络用于建立网格尺度(GS)流场和SGS应力之间的函数关系,而无需对函数形式作任何假设。神经网络的训练和测试所需的数据提供了直接数值模拟(DNS)的湍流槽道流动。结果表明,人工神经网络可以建立一个类似于梯度模型的模型。真实SGS应力与神经网络输出之间的相关系数与相似模型相当或大于相似模型,但小于双参数动态混合模型。

英文摘要:

Artificial neural network (ANN) is tested as a tool for finding a new subgrid model of the subgrid-scale (SGS) stress in large-eddy simulation. ANN is used to establish a functional relation between the grid-scale (GS) flow field and the SGS stress without any assumption of the form of function. Data required for training and test of ANN are provided by direct numerical simulation (DNS) of a turbulent channel flow. It is shown that ANN can establish a model similar to the gradient model. The correlation coefficients between the real SGS stress and the output of ANN are comparable to or larger than similarity models, but smaller than a two-parameter dynamic mixed model.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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