Effects for ICBM Basing. Volume 6. Numerical Simulation and Evaluation of Non-Ideal Airblast
Technical rept. 1 Apr 1986-31 Jul 1987,
SCIENCE APPLICATIONS INTERNATIONAL CORP SAN DIEGO CA
Pagination or Media Count:
The objective of this study was to assess and demonstrate the multi- grid methodology employing the MAGIC model for the study of non-ideal, dusty airblast loads analysis. Two areas of interest to the airblast effects problems were addressed, namely the non-ideal dusty environment flow resulting from both non-precursed shockwaves, as well as the flow field about generic hard mobile launcher HML configurations and resulting loads in that environment. This study utilized the MAGIC turbulent two phase flow numerical model to evaluate both the physical processes and numerical effects on the non-ideal dusty walljet development and the associated loads on two dimensional generic HML shapes. The principal features in the development and application of MAGIC to the present problem include a stochastic particle model to treat soil particles in air, an advanced two equation dynamic turbulence model, a high order accurate Flux Corrected Transport FCT numerical scheme, and a surface aligned conformal grid network. The study demonstrated the viability of a sequential multi-grid methodology in which separate solution domains are defined for the environment and vehicle flow field computations where data from the environment simulation is used to drive the vehicle calculation. This sequential multi-grid approach, along with the use of the surface conformal orthogonal grid system, attempts to reconcile the different resolution needs of the non-ideal dusty walljet flow with the more refined resolution needs of the flow about the HML shape.
- Space Warfare