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arXiv 2203.12946cond-mat.stat-mech
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本质熵格子Boltzmann模型:理论与模拟

Essentially entropic lattice Boltzmann model: Theory and simulations

Mohammad Atif, Praveen Kumar Kolluru, Santosh Ansumali

摘要:

我们提出了一个详细的描述,本质上熵晶格玻尔兹曼模型。熵格子玻尔兹曼模型通过迭代求解非线性熵演化方程保证了无条件的数值稳定性。在本文中,我们解释的封闭形式的解析解的结构,这个方程。我们证明,在平衡附近,这个精确的解决方案减少到标准的格子玻尔兹曼模型。我们考虑几个测试情况下,显示的精确解并没有表现出任何显着的偏差,从迭代解。我们还扩展了ES-BGK模型的解析解,以消除传热问题的普朗特数的限制。精确解的简单性消除了与熵晶格玻尔兹曼模型相关的计算开销和算法复杂性。

英文摘要:

We present a detailed description of the essentially entropic lattice Boltzmann model. The entropic lattice Boltzmann model guarantees unconditional numerical stability by iteratively solving the nonlinear entropy evolution equation. In this paper we explain the construction of closed-form analytic solutions to this equation. We demonstrate that near equilibrium this exact solution reduces to the standard lattice Boltzmann model. We consider a few test cases to show that the exact solution does not exhibit any significant deviation from the iterative solution. We also extend the analytical solution for the ES-BGK model to remove the limitation on the Prandtl number for heat transfer problems. The simplicity of the exact solution removes the computational overhead and algorithmic complexity associated with the entropic lattice Boltzmann models.

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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