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arXiv physics/0005063physics.flu-dyn
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无粘平均运动流体模型的标度性质

Scaling properties of an inviscid mean-motion fluid model

Balasubramanya T. Nadiga

摘要:

考虑了一个具有非线性色散的无粘二维流体模型,该模型同时出现在欧拉方程动力学的粗粒度描述和二阶非牛顿流体的描述中。该模型的守恒能量和涡度拟能的平衡态标度在大尺度上保持了欧拉方程的相应标度,同时大大降低了小尺度的重要性。这是第一次清楚地证明了模型中非线性弥散的有益效果,并应突出其作为亚网格模型在更现实情况下的实用性。

英文摘要:

An inviscid two-dimensional fluid model with nonlinear dispersion that arises simultaneously in coarse-grained descriptions of the dynamics of the Euler equation and in the description of non-Newtonian fluids of second grade is considered. The scaling of the equilibrium states of this model for conserved energy and enstrophy retains the corresponding scaling for the Euler equations on the large scales and at the same time greatly deemphasizes the importance of small scales. This is the first clear demonstration of the beneficial effect of nonlinear dispersion in the model, and should highlight its utility as a subgrid model in more realistic situations.

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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