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CFD Helps Design Future Combat Vehicle

	Posted Mon May 22, 2006 @04:17PM
	To meet the goal of lighter combat vehicles with equivalent firepower, muzzle brakes that redirect part of the gun's propellant flow backwards to reduce the gun's recoil are required. But this redirection must be accomplished while keeping the blast overpressure on the vehicle itself low enough to prevent injury to nearby soldiers as well as damage to the vehicle. A Desktop Engineering article describes how engineers at the Army's Benét Laboratories in Watervliet, New York, have begun using CFD (computational fluid dynamics) to model the gun's recoil forces and blast pressures for different muzzle brake designs to provide optimized solutions of low recoil force with acceptable blast overpressure.

	The key to their success in modeling blast overpressure has been the development and use of CFD software that automatically increases the density of the computational mesh in the area of the blast wave to provide the required accuracy, while keeping the mesh unchanged in other areas where the increased detail is not needed. With future code improvements, it is believed that this will help them get the accuracy they need, where they need it, without the expense of excessive computation times.

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