NASA 1996 SBIR Phase I


PROPOSAL NUMBER : 96-1 01.04-6576

PROJECT TITLE : Implicit Pressure and Density Based Solution Methodologies for All Speed Flows on Distributed Memory Machines

TECHNICAL ABSTRACT (LIMIT 200 WORDS)

This SBIR Phase I project proposes to develop two all speed flow solution methodologies for adaptive Cartesian/prism grids, with parallel implementation on distributed memory machines. The first methodology will be pressure-based and will employ a fully implicit SIMPLE-like approach based on cell-wise least squares linear reconstruction and a Conjugate Gradient Squared (CGS) linear equation solver preconditioned with Incomplete LU factorization (ILU). The governing equations will be solved in a segregated (sequential) manner. The second methodology will be a density-based solution approach with a new flux-splitting scheme (FUSS), applicable to all speed flows. The same linear reconstruction scheme and preconditioned CGS solver will be employed. However the governing equations will be solved in a coupled manner. Both methodologies will be implemented on distributed memory machines based on domain decomposition. The Message Passing Interface (MPI) will be employed to provide data communication.

Several representative test cases will be simulated to evaluate efficiency, robustness and convergence properties of both methods. The parallel performances of both methods will be evaluated on an IBM SP2 and a cluster of SGI workstations.

In Phase II the selected method(s) will be implemented and evaluated for 3D problems on distributed memory machines.

POTENTIAL COMMERCIAL APPLICATIONS
The developed all speed flow solvers along with their parallel implementation will provide an efficient tool for CFD simulations for design purposes. An all speed flow solver capable of tackling flow from incompressible to hypersonic speeds will have wide applications in many distinct industries such as material processing, electronic packaging, automobile, as well as aerospace.
NAME AND ADDRESS OF PRINCIPAL INVESTIGATOR
Z.J. Wang
CFD Research Corporation
3325 Triana Blvd.
Huntsville, AL 35805
NAME AND ADDRESS OF OFFEROR
Z.J. Wang
CFD Research Corporation
3325 Triana Blvd.
Huntsville, AL 35805