用于格子玻尔兹曼方案声学应用的四次参数
Quartic Parameters for Acoustic Applications of Lattice Boltzmann Scheme
AI总结:
通过泰勒展开法推导离散近似特征值的展开式,调整方案参数以实现四阶精度,并针对D3Q27格子玻尔兹曼方案显式求解,数值实验验证了方法的有效性。
摘要:
利用泰勒展开法,我们证明可以改进用于声学应用的格子玻尔兹曼方法。我们推导了离散近似特征值的正式展开,并拟合方案参数以实现四阶精度。借助符号计算求解相应的离散方程。在D3Q27格子玻尔兹曼方案的情况下显式给出了解。各种数值测试支持了该方法的连贯性。
英文摘要:
Using the Taylor expansion method, we show that it is possible to improve the lattice Boltzmann method for acoustic applications. We derive a formal expansion of the eigenvalues of the discrete approximation and fit the parameters of the scheme to enforce fourth order accuracy. The corresponding discrete equations are solved with the help of symbolic manipulation. The solutions are explicited in the case of D3Q27 lattice Boltzmann scheme. Various numerical tests support the coherence of this approach.
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