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Preconditioned Newton Method for Computing Supersonic and Hypersonic Nonequilibrium Flows

机译:用于计算超音速和高音速非平衡流的预处理牛顿法

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摘要

Preconditioned Krylov subspace methods and a Jacobi line relaxation method are tested in an implicit scheme to solve the three-dimensional Navier-Stokes equations for nonequilibrium supersonic and hypersonic flows. Special attention has been paid to the development of vectorizable preconditioned. In the numerical scheme the Jacobian of the fluxes is computed using the first-order inviscid fluxes and a thin shear-layer approximation of the viscous fluxes. In the second part, the influence of these approximations of the Jacobian is examined. Starting from a matrix-free implicit method, the scheme is developed to an exact Newton method without approximations in the Jacobian.
机译:在隐式方案中测试了预处理的Krylov子空间方法和Jacobi线松弛方法,以求解非平衡超音速和高音速流的三维Navier-Stokes方程。已经特别注意了可矢量化预处理的开发。在数值方案中,使用一阶无粘性通量和粘性通量的薄剪切层近似值来计算通量的雅可比行列式。在第二部分中,研究了雅可比近似的影响。从无矩阵隐式方法开始,该方案发展为精确的牛顿法,无需雅可比行列式中的近似值。

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