An Adaptive Dynamical Low Rank Method for the Nonlinear Boltzmann Equation

An Adaptive Dynamical Low Rank Method for the Nonlinear Boltzmann Equation
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非线性Boltzmann方程的自适应动态低阶方法

DOI:
10.1007/s10915-022-01934-4
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发表时间:
2022
影响因子:
2.5
通讯作者:
Wang, Yubo
Wang, Yubo
中科院分区:
数学2区
文献类型:
--
作者:
Hu, Jingwei;Wang, Yubo

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Efficient and accurate numerical approximation of the full Boltzmann equation has been a longstanding challenging problem in kinetic theory. This is mainly due to the high dimensionality of the problem and the complicated collision operator. In this work, we propose a highly efficient adaptive low rank method for the Boltzmann equation, concerning in particular the steady state computation. This method employs the fast Fourier spectral method (for the collision operator) and the dynamical low rank method to obtain computational efficiency. An adaptive strategy is introduced to incorporate the boundary information and control the computational rank in an appropriate way. Using a series of benchmark tests in 1D and 2D, we demonstrate the efficiency and accuracy of the proposed method in comparison to the full tensor grid approach.
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