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Numerical Modeling of the Kinematics of Turbulent Mixing in HE-Driven Blast Waves

Abstract : High-explosive-driven blast waves contain a contact surface (denoting the interface between the detonation products and the air) which is Rayleigh- Taylor instability. The kinematics of the mixing at this surface was studied numerically with a one-dimensional hydrocode. A K-e(Epsilon) turbulence model was used to simulate the growth and decay of turbulence for this problem; source terms were included to model the Rayleigh-Taylor instability mechanism. The numerical calculations demonstrate that this K-e(Epsilon) model does indeed generate turbulent mixing near the contact surface and nowhere else in the flow field. The magnitude of the turbulence depends on the turbulence model parameters, particularly the Rayleigh-Taylor coefficient, C3, and the viscosity coefficient, C micron. Appropriate values for these parameters should be established by comparing the results of parametric calculations with experimental data.