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Communication Dans Un Congrès Année : 2003

CFD Application to Gun Muzzle Blast -A Validation Case Study

Résumé

Accurate modeling of near-field wave propagation is critical to determine blast wave overpressure of large caliber muzzle brakes. Experimental testing to determine blast overpressure is costly, making CFD (Computational Fluid Dynamics) simulations of these flowfields a viable alternative. Techniques and specialized CFD codes are being developed in order to properly model the unsteady, very high-pressure flows of gun muzzle blast. 1-4 Two CFD codes, Fluent 6.1.11 (a prerelease version of Fluent) and the Discontinuous Galerkin Code (DG), developed at Rensselaer Polytechnic Institute were used in a comparison to experimental shadowgraph data from the 7.62 mm NATO rifle G3 using a DM-41 training round for the purpose of developing CFD modeling techniques and validation of the CFD codes. Unsteady grid adaption was used with both solvers in order to reduce solution error near unsteady blast waves and shocks. It is possible to get good results from Fluent with high levels of adaption, however DG, can model blast with courser grid adaption. It was also found that DG required an order of magnitude longer solution time than Fluent for a given number of grid elements. The 7.62 mm NATO G3 CFD precursor flow results matched experimental shadowgraph results well, however, the main propellant flow did not.
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hal-03939856 , version 1 (15-01-2023)

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Daniel L Cler, Nicolas Chevaugeon, Mark S Shephard, Joseph E Flaherty. CFD Application to Gun Muzzle Blast -A Validation Case Study. 41st AIAA Aerospace Science Meeting and Exhibit, AIAA, Jan 2003, Reno, Nevada, USA, United States. ⟨10.2514/6.2003-1142⟩. ⟨hal-03939856⟩
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