Structured grid solvers such as NASA’s OVERFLOW compressible Navier-Stokes flow solver can generate large data files that contain convergence histories for flow equation residuals, turbulence model equation residuals, component forces and moments, and component relative motion dynamics variables. Most of today’s largescale problems can extend to hundreds of grids, and over 100 million grid points. However, due to the lack of efficient tools, only a small fraction of information contained in these files is analyzed.

OVERSMART (OVERFLOW Solution Monitoring And Reporting Tool) provides a comprehensive report of solution convergence of flow computations over large, complex grid systems. It produces a one-page executive summary of the behavior of flow equation residuals, turbulence model equation residuals, and component forces and moments. Under the automatic option, a matrix of commonly viewed plots such as residual histograms, composite residuals, sub-iteration bar graphs, and component forces and moments is automatically generated. Specific plots required by the user can also be prescribed via a command file or a graphical user interface. Output is directed to the user’s computer screen and/or to an html file for archival purposes.

The current implementation has been targeted for the OVERFLOW flow solver, which is used to obtain a flow solution on structured overset grids. The OVERSMART framework allows easy extension to other flow solvers.

This work was done by David L. Kao and William M. Chan of Ames Research Center. OVERSMART is part of the Chimera Grid Tools software package (ARC-16025-1), which is available for U.S. general release. Please contact Martha Del Alto, Software Release Authority, at This email address is being protected from spambots. You need JavaScript enabled to view it. for further inquiries. ARC-16025-1A

NASA Tech Briefs Magazine

This article first appeared in the August, 2012 issue of NASA Tech Briefs Magazine.

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