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Blast Waves - Examples Gun blasts Firearm firing CFD animation of blast wave 2 Blast wave effects on buildings
Blast Waves • A blast wave is the pressure and flow resulting from the deposition of a large amount of energy in a small very localized volume. – Flow field can be approximated as a lead shock wave, followed by a 'selfsimilar' subsonic flow field • Shock waves cause a virtually instantaneous jump in pressure at the shock front • The combination of the pressure jump (called the overpressure) and the dynamic pressure causes blast damage • It is necessary to understand blast wave to – Estimate the damage that will result from an explosion – To devise mechanisms for mitigating the blast 3
Page 1: 2008 International ANSYS Conference
Page 5 and 6: Simulation Approach • CFD finite-
Page 7 and 8: Validation 1 - Small Caliber Gun Re
Page 9 and 10: BWIP Development Rationale • Stan
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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