In this paper a new moving-boundary algorithm is presented for the solution of two-dimensional flows on unstructured grids. Applica- tion of this algorithm is investigated by simulating the internal ballistics of solid rocket motors (SRM). Solution domain is discre- tised to a number of triangular elements using control-volume based finite-element (CVFE) method. Euler equations are integrated over the control volumes, and Roe's flux-difference scheme is used to evaluate flux vectors at the control-volume surfaces. To eliminate numerical errors due to grid movement, geometric conservation laws (GCL) are carefully implemented.
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