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Upwind Navier-Stokes 방정식을 이용한 무딘 물체 주위의 유동장 해석
권창오(C. O. Kwon),김상덕(S. D. Kim),송동주(D. J. Song) 한국전산유체공학회 1996 한국전산유체공학회지 Vol.1 No.1
In this paper the upwind flux difference splitling Navier-Stokes method has been applied to study the perfect gas and the equilibrium chemically reacting hypersonic flow over an axisymmetric sphere-cone(5˚) geometry. The effective gamma(r). enthalpy to internal energy ratio was used to couple chemistry with the fluid mechanics for equilibrium chemically reacting air. The test case condition was at altitude(30Km) and Mach number(15). The equilibrium shock thickness over the blunt body region was much thinner than that of perfect gas shock. The pressure difference between perfect gas and equilibrium gas was about 3-5 percent. The heat transfer coefficient were also calculated. The results were compared with VSL results in order to validate the current numerical analysis. The results from current method were compared well VSL results; however. not well at near nose. The proper boundary condition and grid system Will be studied to improve the solution quality.
A COMPUTATIONAL ANALYSIS OF FINITE RATE CHEMICALLY REACTING FLOW BY USING UPWIND N-S METHOD
서정일(J. I. Seo),권창오(C. O. Kwon),송동주(D. J. Song) 한국전산유체공학회 2000 한국전산유체공학회 학술대회논문집 Vol.2000 No.5
A two-dimensional/axisymmetric CSCM upwind flux difference splitting Navier-Stokes method has been developed to study the finite rate chemically reacting invisicd and viscous hypersonic flows over blunt-body. A upwind method was chosen due to its robustness in capturing the strong bow shock waves. For the nonequilibrium chemically reacting air, NS-1 species conservation equations were strongly coupled with flowfield equations through convection and species production terms. The nonequilibrium wall pressure and heat transfer rate distributions along the vehicle were compared with those from equilibrium and perfect gas calculations. The nonequilibrium species distribution shows the reduced concentrations of O and N species when compared with equilibrium species distribution. The solutions resolved strong bow shock waves and heat transfer rate very accurately when compared with central difference schemes.