TY - GEN
T1 - On the non-reflective boundary conditions for chemically reactive flows
AU - Ju, Y.
AU - Yuan, J.
AU - Kobayashi, H.
AU - Masuya, Goro
N1 - Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2003
Y1 - 2003
N2 - Rigorous non-reflective boundary conditions for the multi-component, chemically non-equilibrium reactive flows with real gas effect were derived with the coupling of the species conservations and the fluid equations. The chemically non-equilibrium sound speed was obtained directly from the matrix decomposition of the conservation equations. It was shown that the sound speed of chemically non-equilibrium flow with real gas effect is different from the frozen sound speed of the mixture. The present derivation of non-reflective boundary condition provides the consistency in the characteristic wave speeds for both numerical algorithms of governing equations and boundary conditions. In the limit of single species, the present result reduces to the previous non-reflective boundary conditions given by Poinsot and Lele. The boundary conditions were tested by the shock wave, acoustic wave, vortex and diffusion and premixed flame propagation involving the detailed chemistry and variable thermal properties. The results showed that improper boundary condition generates reflective waves and high frequency noise in the computation domain. It is demonstrated that the present boundary conditions are robust and allow the acoustic and combustion waves propagating out the boundary without causing wave reflection.
AB - Rigorous non-reflective boundary conditions for the multi-component, chemically non-equilibrium reactive flows with real gas effect were derived with the coupling of the species conservations and the fluid equations. The chemically non-equilibrium sound speed was obtained directly from the matrix decomposition of the conservation equations. It was shown that the sound speed of chemically non-equilibrium flow with real gas effect is different from the frozen sound speed of the mixture. The present derivation of non-reflective boundary condition provides the consistency in the characteristic wave speeds for both numerical algorithms of governing equations and boundary conditions. In the limit of single species, the present result reduces to the previous non-reflective boundary conditions given by Poinsot and Lele. The boundary conditions were tested by the shock wave, acoustic wave, vortex and diffusion and premixed flame propagation involving the detailed chemistry and variable thermal properties. The results showed that improper boundary condition generates reflective waves and high frequency noise in the computation domain. It is demonstrated that the present boundary conditions are robust and allow the acoustic and combustion waves propagating out the boundary without causing wave reflection.
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U2 - 10.2514/6.2003-3969
DO - 10.2514/6.2003-3969
M3 - Conference contribution
AN - SCOPUS:85087598198
SN - 9781624100864
T3 - 16th AIAA Computational Fluid Dynamics Conference
BT - 16th AIAA Computational Fluid Dynamics Conference
PB - American Institute of Aeronautics and Astronautics Inc.
T2 - 16th AIAA Computational Fluid Dynamics Conference 2003
Y2 - 23 June 2003 through 26 June 2003
ER -