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A nondispersive and nondissipative finite-difference lattice Boltzmann method

机译:非色散非散度有限差分格子玻尔兹曼方法

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In this paper a finite-difference lattice Boltzmann method is introduced, discretizing the lattice Boltzmann equation by centered-time and centered-space finite differences. It is well known from numerical analysis that such discretization of the derivatives results in numerical dispersion and dissipation. The numerical dispersion is eliminated perfectly by using a fictitious absorption term in the master equation and the dissipation is compensated by solving a second, reference equation and the method of division. As a test problem, the evolution of a decaying Taylor vortex in a 2pi periodic domain is studied. [References: 12]
机译:本文介绍了一种有限差分格子玻尔兹曼方法,通过中心时间和中心空间有限差分离散化格子玻尔兹曼方程。从数值分析众所周知,导数的这种离散导致数值分散和耗散。通过在主方程中使用虚拟吸收项来完美消除数值色散,并通过求解第二参考方程和除法来补偿耗散。作为一个测试问题,研究了一个2pi周期域中衰减泰勒涡旋的演化。 [参考:12]

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