Numerical Analysis of Thermochemical Nonequilibrium Flows Using a Diagonal Lower-Upper Implicit Scheme
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概要
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In this paper, an efficient and robust implicit scheme for the calculations of thermochemical nonequilibrium flows is presented. In the implicit operator, approximations for the inviscid flux Jacobians and the thermochemical source term Jacobian are used in order to avoid matrix inversions and to eliminate the strong nonlinearity of the thermochemical source term. The residual is spatially discretized using a MUSCL-type, finite volume formulation. The inviscid fluxes at cell interfaces are evaluated by van Leer's flux-vector splitting method extended to incorporate thermochemical nonequilibrium. Numerical results show that the scheme is so robust that very large sizes of time steps are allowed in spite of stiffness caused by thermochemical source terms. Furthermore, the results show the importance of the effective cross section of the vibrational excitation, σ_<vib>, in the thermochemical nonequilibrium flow calculations.
- 一般社団法人日本機械学会の論文
- 1995-08-15
著者
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Sakamura Yoshitaka
Department Of Aeronautics And Astronautics Kyushu University
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Nishida Michio
Department Of Aemonautical Engineering Kyushu University
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