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arXiv 1311.6535physics.flu-dyn
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玻色子和费米子的格子玻尔兹曼方法及四阶Hermite多项式展开

Lattice Boltzmann method for bosons and fermions and the fourth order Hermite polynomial expansion

Rodrigo C. V. Coelho, Anderson Ilha, M. M. Doria, R. M. Pereira, Valter Yoshihiko Aibe

摘要:

考虑玻色-爱因斯坦和费米-狄拉克平衡分布函数的玻尔兹曼方程与Bhatnagar-Gross-Krook碰撞算子。我们表明,扩张的微观速度的埃尔米特多项式必须进行,直到四阶正确描述的能量方程。用J.Y. Yang等人通过Uehling-Uhlenbeck方法,也在这里得到。因此,只要将玻色-爱因斯坦和费米-狄拉克平衡分布函数展开到厄米多项式的四阶,就有可能构造量子流体的格子玻尔兹曼方法.

英文摘要:

The Boltzmann equation with the Bhatnagar-Gross-Krook collision operator is considered for the Bose-Einstein and Fermi-Dirac equilibrium distribution functions. We show that the expansion of the microscopic velocity in terms of Hermite polynomials must be carried until the fourth order to correctly describe the energy equation. The viscosity and thermal coefficients, previously obtained by J.Y. Yang et al through the Uehling-Uhlenbeck approach, are also derived here. Thus the construction of a lattice Boltzmann method for the quantum fluid is possible provided that the Bose-Einstein and Fermi-Dirac equilibrium distribution functions are expanded until fourth order in the Hermite polynomials.

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