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Partial Newton-Krylov iterative methods for a system of energy equations with three-temperatures

机译:具有三个温度的能量方程组的局部牛顿-克雷洛夫迭代方法

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Computer codes containing both hydrodynamic and radiation play a central role in simulating both astrophysical and inertial confinement fusion (ICF) phenomena. A crucial aspect of these codes is that they require an implicit solution of the radiative diffusion equations. In this article we propose a frame of partial Newton-Krylov iterative methods for nonlinear systems derived from implicit solution of 2-D energy equations with three-temperature. First, a partial Newton method is developed to solve the nonlinear system obtained from a nine-point difference scheme. Second, preconditioned Krylov subspace methods are applied to solve the partial Newton correction equation. For comparison, we choose three preconditioners-partial scaling, ILUT, and full scaling plus ILUT-and four Krylov subspace methods-GMRES, FOM, BiCGSTAB, and TFQMR. Numerical results show the efficiency of our method and also show that the scaling preconditioned BiCGSTAB and ILUT preconditioned GMRES are better choices.
机译:包含流体动力和辐射的计算机代码在模拟天体物理和惯性约束聚变(ICF)现象中都发挥着核心作用。这些代码的一个关键方面是,它们需要辐射扩散方程的隐式解。在本文中,我们提出了一种非线性系统的局部Newton-Krylov迭代方法的框架,该方法由具有三温度的2-D能量方程的隐式解导出。首先,开发了一种局部牛顿法来求解从九点差分法获得的非线性系统。其次,采用预处理的Krylov子空间方法来求解部分牛顿校正方程。为了进行比较,我们选择了三种预处理器-部分缩放,ILUT和完全缩放以及ILUT-和四种Krylov子空间方法-GMRES,FOM,BiCGSTAB和TFQMR。数值结果证明了我们方法的有效性,并且表明缩放比例预处理的BiCGSTAB和ILUT预处理的GMRES是更好的选择。

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