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arXiv math/0405171math.APmath.NT
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圆上格点与Boltzmann方程的离散速度模型

Lattice Points on Circles and Discrete Velocity Models for the Boltzmann Equation

L. Fainsilber, P. Kurlberg, B. Wennberg

摘要:

玻尔兹曼方程的离散速度模型或数值方法的构造可能导致将碰撞算子计算为格点上的和的必要性。碰撞算子涉及球面上的积分,这对应于能量和动量守恒。在第二个维度有困难,甚至在证明这种近似的收敛性,因为许多圆包含很少的格点,有些圆包含许多不良分布的格点。然而,通过显示大多数圆上的格点是均匀分布的,我们发现碰撞算子确实可以近似为二维情况下格点的和。对于更高的维数,这个结果已经由A. Bobylev et.(SIAM J.数值分析34第5期第1865-1883页(1997))

英文摘要:

The construction of discrete velocity models or numerical methods for the Boltzmann equation, may lead to the necessity of computing the collision operator as a sum over lattice points. The collision operator involves an integral over a sphere, which corresponds to the conservation of energy and momentum. In dimension two there are difficulties even in proving the convergence of such an approximation since many circles contain very few lattice points, and some circles contain many badly distributed lattice points. However, by showing that lattice points on most circles are equidistributed we find that the collision operator can indeed be approximated as a sum over lattice points in the two-dimensional case. For higher dimensions, this result has already been obtained by A. Bobylev et. al. (SIAM J. Numerical Analysis 34 no 5 p. 1865-1883 (1997))

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