Numerical Investigation on the Muzzle Flow Field Based on Level Set Method

The muzzle flow field was simulated numerically in thispaper. Instead of a more traditional deformable mesh approach, a novel fixed mesh approach which use a level set function to implicitly track the fluid-solid interface was described. The interface boundary conditions were also captured implicitly by combining a Ghost Fluid Method (GFM) with the level set approach. Both the HUE method and operator-splitting technique were used to discretize the axis symmetric Euler equations. This method was more efficient since no mesh modification is necessary and can be easily extended to three dimensional questions. It also had applicability for problems with complex object motion or complex geometry. From the numerical results, the coupling and interaction between the moving projectile and gas flow field were discussed in detail. Analysis of influencing factors on sudden changes in the acceleration of projectile was given.