UUGM Code Development

The primary objective of SAIC was to develop an unstructured grid algorithm and code that dynamically adapts to the computed solution of the time dependent Euler equations of gasdynamics in two and three spatial dimensions. Important requirements that were imposed on the algorithm were robustness, accuracy, efficiency, flexibility, and adaptability. The main research and code development effort was focused on achieving these objectives extensive testing and cods validation effort was undertaken to demonstrate the codes performance for realistic CFD problems. The method is accurate in all flow regimes from subsonic to hypersonic. The main achievement was the development of the AUGUST code Adaptive Unstructured Grid Upwind Second Order for Triangles. AUGUST is implemented for solution of Eulers equations on dynamically adaptive triangular or tetrahedral grids. The code fully implements the Second-Order Godunov method, allowing accurate and robust numerical solution of Euler equations of gas dynamics. A new method was developed for Direct Dynamic Grid Refinement DDR. The AUGUST code was also implemented for multiphase, multicomponent flows. A combined structuredunstructured version of the AUGUST code was also developed. The AUGUST code was extensively validated for a wide range of problems and has proven to be a robust tool.