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Unstructured Grid Adaptation and Solver Technology for Turbulent FlowsUnstructured grid adaptation is a tool to control Computational Fluid Dynamics (CFD) discretization error. However, adaptive grid techniques have made limited impact on production analysis workflows where the control of discretization error is critical to obtaining reliable simulation results. Issues that prevent the use of adaptive grid methods are identified by applying unstructured grid adaptation methods to a series of benchmark cases. Once identified, these challenges to existing adaptive workflows can be addressed. Unstructured grid adaptation is evaluated for test cases described on the Turbulence Modeling Resource (TMR) web site, which documents uniform grid refinement of multiple schemes. The cases are turbulent flow over a Hemisphere Cylinder and an ONERA M6Wing. Adaptive grid force and moment trajectories are shown for three integrated grid adaptation processes with Mach interpolation control and output error based metrics. The integrated grid adaptation process with a finite element (FE) discretization produced results consistent with uniform grid refinement of fixed grids. The integrated grid adaptation processes with finite volume schemes were slower to converge to the reference solution than the FE method. Metric conformity is documented on grid/metric snapshots for five grid adaptation mechanics implementations. These tools produce anisotropic boundary conforming grids requested by the adaptation process.
Document ID
20180006169
Document Type
Conference Paper
Authors
Park, Michael A.
(NASA Langley Research Center Hampton, VA, United States)
Barral, Nicolas
(Imperial Coll. of London London, United Kingdom)
Ibanez, Daniel
(Sandia National Labs. Albuquerque, NM, United States)
Kamenetskiy, Dmitry
(Boeing Commercial Airplane Co. Seattle, WA, United States)
Krakos, Joshua
(Boeing Co. Saint Louis, MO, United States)
Michal, Todd
(Boeing Co. Saint Louis, MO, United States)
Loseille, Adrien
(Institut National de Recherche d'Informatique et d'Automatique Le Chesnay, France)
Date Acquired
October 9, 2018
Publication Date
January 8, 2018
Subject Category
Numerical Analysis
Report/Patent Number
NF1676L-27296
Meeting Information
Meeting: AIAA SciTech
Location: Kissimmee, FL
Country: United States
Start Date: January 8, 2018
End Date: January 12, 2018
Sponsors: American Inst. of Aeronautics and Astronautics
Funding Number(s)
WBS: WBS 110076.02.07.03.15
Distribution Limits
Public
Copyright
Public Use Permitted.
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