Numerical Simulation of Interaction of Blast Wave Generated from Cannon with Wall at Different Pressure Ratio

A computational fluid dynamic method has been applied to simulate the pressure blast from a cannon and to investigate the pressure distribution on a wall located in front of the cannon. By solving this problem, peak value of pressure on wall has been calculated for different pressure ratio of driver and driven section in the cannon. By taking the maximum value of pressure at a particular pressure ratio as factor of safety, we have to invent a blast wave resisting jacket which will be helpful for blast wave explosion. The Advection Upstream Splitting Method (AUSM) scheme with third-order Monotone Upstream centered Scheme for Conservation Laws (MUSCL) approach were used for solving the unsteady, axisymmetric Navier–Stokes equation. Density-based solver was selected for present simulation due to its high-speed compressibility. The standard K-epsilon model with standard wall function is used for this simulation which is highly suitable for wall phenomenon problems. At the initial condition of this problem, the driver section of cannon is given to high pressure and driven section is at atmospheric pressure. After firing from cannon, flow of air take place from driver section to driven section and at advance time air flows out from the cannon. At exit of the cannon blast wave formation takes place which move in forward direction and after some time it strikes to the wall and move in backward direction. The computational result indicated that on increasing the pressure ratio in cannon causes the multiple fluctuations in pressure on the wall. The increase in pressure ratio also increases the peak pressure on wall.