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arXiv 0901.1946physics.flu-dyn
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具有自洽热流体动力学平衡的格子玻尔兹曼方法

Lattice Boltzmann method with self-consistent thermo-hydrodynamic equilibria

M. Sbragaglia, R. Benzi, L. Biferale, H. Chen, X. Shan, S. Succi

摘要:

晶格动力学方程纳入外部/内力领域的影响,通过移动的局部领域的局部平衡,被放置在连续动力学理论的框架内。数学处理表明,为了与正确的热流体动力学描述相一致,除了动量之外,温度也必须移动。新的观点制定的热流体动力学晶格动力学模型的非理想流体,然后设想。它还表明,在晶格上,宏观温度的定义需要包括新的条款直接相关的离散效应。对一个非理想状态方程的控制情况下的理论处理进行了测试。

英文摘要:

Lattice kinetic equations incorporating the effects of external/internal force fields via a shift of the local fields in the local equilibria, are placed within the framework of continuum kinetic theory. The mathematical treatment reveals that, in order to be consistent with the correct thermo-hydrodynamical description, temperature must also be shifted, besides momentum. New perspectives for the formulation of thermo-hydrodynamic lattice kinetic models of non-ideal fluids are then envisaged. It is also shown that on the lattice, the definition of the macroscopic temperature requires the inclusion of new terms directly related to discrete effects. The theoretical treatment is tested against a controlled case with a non ideal equation of state.

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