Simulations of Special Interior Ballistic Phenomena with and without Heat Transfer to the Gun Tube Wall,
FRAUNHOFER INST FUER KURZZEITDYNAMIK - ERNST-MACH-INST FREIBURG (GERMANY F R)
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The computer code DELTA uses a linearized Alternating Direction Implicit ADI scheme to provide a numerical approximation of the solution of the averaged two-phase gas solid two-dimensional axisymmetric equations governing viscous interior ballistic flows within conventional guns. To further the understanding of phenomena affecting gun tube life as well as gun performance, a heat transfer model, which simulates the interactions of fluid dynamics and thermal profile in the gun tube wall, has been incoporated in the DELTA code. The same linearized ADI method is utilized to obtain the numerical solution of the two-dimensional nonlinear heat conduction equation in the gun tube. Our model of the heat transfer process couples completely and simultaneously all three controlling events without any approximations to the governing equations that is, the axisymmetric viscous flow within the entire gun tube which naturally gives a precise definition of the gas thermal boundary layer, the time-dependent balance of the heat fluxes at the inner wall surface, and the two-dimensional temperature calculation within the gun tube wall. The nonlinear heat flux boundary conditions at the inner and outer tube surfaces are linearized as to be compatible with the solution scheme.