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Pressure outlet Validation 1 – Preprocessing and Results Pressure-inlet Quad-paved grid with coarse spacing near outlet; structured grid in barrel and tight spacing near muzzle 1st Pre-Cursor FLUENT: t = -350 sec t = -5 sec t = -+120 sec 8 2nd Pre-Cursor Main blast wave Experiment
BWIP Development Rationale • Standard Gradient Adaption Limitations – Poor Coarsening after Wave Passes – Loss of Adaption as Blast Wave Weakens – Over-adaption in Uncritical Areas – Unable to Utilize Advance Register Combinations to Improve Performance • Blast Wave Identification Parameter (BWIP) – Track Primary and Reflected Waves – Ignore Other Pressure Gradients – Fine Control of Adaption Level on Shock Fronts 9
Page 1 and 2: 2008 International ANSYS Conference
Page 3 and 4: Blast Waves • A blast wave is the
Page 5 and 6: Simulation Approach • CFD finite-
Page 7: Validation 1 - Small Caliber Gun Re
Page 11 and 12: Validation 2 - Mesh and Solution-ba
Page 13 and 14: Validation 2 - Results Mesh Static
Page 15 and 16: Advanced BWIP Development max p •
Page 17 and 18: Validation 3 - Side-on Pressure 17
Page 19 and 20: Validation 3 - Maximum Overpressure
Page 21 and 22: Validation 3 - Animation 2 21
Page 23 and 24: Validation 4 - Fixed Mesh vs BWIP F
Page 25 and 26: Overpressure (psi) 15 10 Validation
Page 27: Conclusions • High-quality 3-D bl

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