Cartesian Off-Body Grid Adaption for Viscous Time- Accurate Flow Simulation

An improved solution adaption capability has been implemented in the OVERFLOW overset grid CFD code. Building on the Cartesian off-body approach inherent in OVERFLOW and the original adaptive refinement method developed by Meakin, the new scheme provides for automated creation of multiple levels of finer Cartesian grids. Refinement can be based on the undivided second-difference of the flow solution variables, or on a specific flow quantity such as vorticity. Coupled with load-balancing and an inmemory solution interpolation procedure, the adaption process provides very good performance for time-accurate simulations on parallel compute platforms. A method of using refined, thin body-fitted grids combined with adaption in the off-body grids is presented, which maximizes the part of the domain subject to adaption. Two- and three-dimensional examples are used to illustrate the effectiveness and performance of the adaption scheme.

[1]  Michael J. Aftosmis,et al.  Multilevel Error Estimation and Adaptive h-Refinement for Cartesian Meshes with Embedded Boundaries , 2002 .

[2]  Robert L. Meakin.  An Efficient Means of Adaptive Refinement Within Systems of Overset Grids , 1995 .

[3]  Andrew James Mayfield,et al.  Adaptive mesh refinement , 1993 .

[4]  Terry L. Holst,et al.  Viscous transonic airfoil workshop compendium of results , 1987 .

[5]  William D. Henshaw,et al.  Parallel computation of three-dimensional flows using overlapping grids with adaptive mesh refinement , 2008, J. Comput. Phys..

[6]  Robert Meakin.  A new method for establishing intergrid communication among systems of overset grids , 1991 .

[7]  J. Benek,et al.  A 3-D Chimera Grid Embedding Technique , 1985 .

[8]  Robert L. Meakin,et al.  CHSSI Software for Geometrically Complex Unsteady Aerodynamic Applications , 2001 .

[9]  Neal Chaderjian,et al.  High Resolution Navier-Stokes Simulation of Rotor Wakes , 2011 .

[10]  Pieter G. Buning,et al.  Evaluation of Two High-Order Weighted Essentially Nonoscillatory Schemes , 2008 .

[11]  John C. Vassberg,et al.  OVERFLOW Analysis of the NASA Trap Wing Model from the First High Lift Prediction Workshop , 2011 .

[12]  M. Berger,et al.  Adaptive mesh refinement for hyperbolic partial differential equations , 1982 .

[13]  Robert H. Nichols,et al.  Solver and Turbulence Model Upgrades to OVERFLOW 2 for Unsteady and High-Speed Applications , 2006 .

[14]  Andrew M. Wissink,et al.  Cartesian Adaptive Mesh Refinement for Rotorcraft Wake Resolution , 2010 .

[15]  Robert L. Meakin,et al.  On automating domain connectivity for overset grids , 1995 .

[16]  W. K. Anderson,et al.  Grid convergence for adaptive methods , 1991 .

[17]  Mark Potsdam,et al.  Rotor Airloads Prediction Using Loose Aerodynamic/Structural Coupling , 2004 .

[18]  W. Henshaw,et al.  An adaptive numerical scheme for high-speed reactive flow on overlapping grids , 2003 .

[19]  Thomas Pulliam,et al.  High Order Accurate Finite-Difference Methods: as seen in OVERFLOW , 2011 .

[20]  Robert L. Meakin,et al.  Object X-Rays for Cutting Holes in Composite Overset Structured Grids , 2001 .