Accession Number : ADA269945


Title :   UUGM Code Development


Descriptive Note : Final rept. 1 Dec 1991-31 Mar 1993


Corporate Author : SCIENCE APPLICATIONS INTERNATIONAL CORP MCLEAN VA


Personal Author(s) : Eidelman, Shumel ; Grossmann, William ; Lottati, Itzhak ; Yang, Xiaolong ; Fritts, Marty ; Drobot, Adam ; Kress, Michael ; Friedman, Aaron


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a269945.pdf


Report Date : 26 Jul 1993


Pagination or Media Count : 693


Abstract : 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 code's 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 Euler's 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 structured/unstructured 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.


Descriptors :   *COMPUTER PROGRAMS , *GAS DYNAMICS , *EULER EQUATIONS , ALGORITHMS , COMPUTERIZED SIMULATION , REQUIREMENTS , TIME DEPENDENCE , VALIDATION , THREE DIMENSIONAL , TRIANGLES , FLUID FLOW , SUBROUTINES , COMPUTER APPLICATIONS , TIME , TOOLS , TWO DIMENSIONAL , GRIDS , ACCURACY , EFFICIENCY


Subject Categories : Computer Programming and Software
      Fluid Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE