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Application of the FUN3D Unstructured-Grid Navier-Stokes Solver to the 4th AIAA Drag Prediction Workshop CasesFUN3D Navier-Stokes solutions were computed for the 4th AIAA Drag Prediction Workshop grid convergence study, downwash study, and Reynolds number study on a set of node-based mixed-element grids. All of the baseline tetrahedral grids were generated with the VGRID (developmental) advancing-layer and advancing-front grid generation software package following the gridding guidelines developed for the workshop. With maximum grid sizes exceeding 100 million nodes, the grid convergence study was particularly challenging for the node-based unstructured grid generators and flow solvers. At the time of the workshop, the super-fine grid with 105 million nodes and 600 million elements was the largest grid known to have been generated using VGRID. FUN3D Version 11.0 has a completely new pre- and post-processing paradigm that has been incorporated directly into the solver and functions entirely in a parallel, distributed memory environment. This feature allowed for practical pre-processing and solution times on the largest unstructured-grid size requested for the workshop. For the constant-lift grid convergence case, the convergence of total drag is approximately second-order on the finest three grids. The variation in total drag between the finest two grids is only 2 counts. At the finest grid levels, only small variations in wing and tail pressure distributions are seen with grid refinement. Similarly, a small wing side-of-body separation also shows little variation at the finest grid levels. Overall, the FUN3D results compare well with the structured-grid code CFL3D. The FUN3D downwash study and Reynolds number study results compare well with the range of results shown in the workshop presentations.
Document ID
20100024974
Acquisition Source
Langley Research Center
Document Type
Conference Paper
Authors
Lee-Rausch, Elizabeth M. (NASA Langley Research Center Hampton, VA, United States)
Hammond, Dana P. (NASA Langley Research Center Hampton, VA, United States)
Nielsen, Eric J. (NASA Langley Research Center Hampton, VA, United States)
Pirzadeh, S. Z. (NASA Langley Research Center Hampton, VA, United States)
Rumsey, Christopher L. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 24, 2013
Publication Date
June 28, 2010
Subject Category
Aerodynamics
Report/Patent Number
NF1676L-9757
Meeting Information
Meeting: 28th AIAA Applied Aerodynamics Conference
Location: Chicago, IL
Country: United States
Start Date: June 28, 2010
End Date: July 1, 2010
Sponsors: American Inst. of Aeronautics and Astronautics
Funding Number(s)
WBS: WBS 561581.02.08.07.18.03
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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