Development of Methodology for Moving Body Simulation Based on Computational Fluid Dynamics
Navy SBIR FY2008.2

Sol No.: Navy SBIR FY2008.2
Topic No.: N08-118
Topic Title: Development of Methodology for Moving Body Simulation Based on Computational Fluid Dynamics
Proposal No.: N082-118-0523
Firm: Digital Fusion
5030 Bradford Drive
Building 1, Suite 210
Huntsville, Alabama 35805
Contact: Shawn Westmoreland
Phone: (256) 327-8129
Web Site:
Abstract: For moving body problems with complex geometries, a robust and reliable approach to constructing computational domains is needed. Based upon our extensive engineering experience with overset grid methods, Digital Fusion Solutions, Inc. (DFSI) proposes to implement new and transfer existing technologies to alleviate the challenges facing unstructured overset grids. The techniques to be implemented are: 1) an innovative hole-cutting technique based on the solution of Green's Function, 2) a general finite-volume flux reconstruction approach for boundary cells, and 3) an optimized, or minimum, overlap algorithm to ensure that the global solution is computed on only the best cells. Unstructured overset methods show great potential for moving body problems particularly in automated grid generation. The current trend is to apply structured overset grid techniques to unstructured grids, where long standing issues related to orphan points, interpolation inaccuracies, and searching inefficiencies are still not adequately addressed. For moving body problems, a generalized overset capability is highly desirable, to avoid methods that require grid stretching, regridding, and interpolation. Under this SBIR we will implement these new techniques for two-dimensional problems using an open-source flow solver. Phase II will extend the methods to three-dimensions, and transfer the technology to the engineering analysis environment.
Benefits: The F-35 Joint Strike Fighter Program will benefit in the near term with greatly enhanced capabilities for supporting Test and Evaluation efforts. The proposed unstructured overset capability will combine the benefits of rapid grid generation with well-developed methods of treating moving bodies time-accurately, which is required for store separation certification. Potential commercial applications include rapid analysis for missiles, aircraft, and blast mitigation. Customers will include Army, Navy, Air Force, NASA, and DTRA, and will cover all aerodynamic configurations and urban environments. DFSI anticipates commercially supporting the use and application of the proposed product with these customers.