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Airblast Simulations Using Flux-Corrected Transport Codes.
NAVAL RESEARCH LAB WASHINGTON DC
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Flow fields resulting from the passage of a blast wave through a mixture of high-explosive detonation products and air can be significantly altered as compared to a single phase medium. The description of the two phase flow has been numerically simulated in one 1-D and two-dimensional 2-D calculations using multi-dimensional flux corrected transport FCT techniques. Calculated and experimentally determined flow field have been compared. FCT is a finite difference technique for solving fluid equations in problems where sharp discontinuities arise. Shocks, slip surfaces, and contact surfaces are accurately modeled through the application of diffusion and anti-diffusion at each timestep. This diffusion is just large enough to prevent dispersive ripples and guarantees that all physically positive conserved quantities remain positive. Simulation of two phase flow is natural outgrowth of the FCT tn Each species is treated as a separate fluid with the pressure terms in the energy and momentum equations providing the coupling. Moreover, the timestep-split feature of the most recent version of FCT allows extension from 1 D to 2 D simulation. Results are compared with shock tube and field test data.
APPROVED FOR PUBLIC RELEASE