Numerical simulation of unsteady flows with transient regimes |
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Authors: | V I Pinchukov |
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Institution: | 1.Institute of Computational Technologies, Siberian Branch,Russian Academy of Sciences,Novosibirsk,Russia |
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Abstract: | Self-oscillatory flows in aerodynamics and astrophysics are studied. The two-dimensional compressible gas equations are solved
using the implicit Runge-Kutta scheme of the third order with respect to the inviscid terms and of the second order with respect
to the viscous terms. An algebraic Cebeci-Smith turbulence model is used. Weakly unsteady and strongly unsteady flow regimes
are observed. The former occur in a supersonic flow past a cylinder with a front projection and in the heliosphere. Such flows
became stable when the turbulent diffusion is taken into account. The latter flows occur when a supersonic jet meets an obstacle
and when such a jet penetrates a cavity. In these flows, the amplitude of oscillations slightly decreases when the turbulent
diffusion is taken into account. |
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Keywords: | |
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