Third Drag Prediction Workshop Results Using the NSU3D Unstructured Mesh Solver

Results from the third AIAA drag prediction workshop on using the unstructured mesh Reynolds-averaged Navier-Stokes solver NSU3D are presented. Computations include a grid convergence study on a transonic wing-body and wing-body-fairing configuration at a fixed C L condition using grids up to 41 million points, as well as an incidence sweep (drag polar) at fixed Mach and Reynolds numbers. A second set of results on a pair of closely related wing geometries is also described, including a grid convergence study at a fixed incidence and an incidence sweep (drag polar) for both wing geometries. For all cases, approximate second-order-accurate grid convergence characteristics are demonstrated, with overall accuracy and efficiency comparable with other structured, overset, and unstructured workshop calculations. However, it is found that differing grid-converged results may be inferred based on different families of self-similar coarse and fine-grid sequences, particularly for values such as absolute drag at a fixed incidence. More consistent grid convergence for idealized drag values (omitting induced drag) is observed, thus validating the procedure of performing grid convergence studies at a fixed C L . These grid convergence issues are attributed to the large range of disparate scales that must be resolved in aerodynamic flows, and they point to the need for further advances in quantifying and resolving discretization errors for such problems.

[1]  Mark Rakowitz,et al.  Structured and Unstructured Computations on the DLR-F4 Wing-Body Configuration , 2002 .

[2]  D. Mavriplis.  Multigrid Strategies for Viscous Flow Solvers on Anisotropic Unstructured Meshes , 1997 .

[3]  Steven Klausmeyer,et al.  Drag, Lift, and Moment Estimates of Transonic Aircraft Using the Navier-Stokes Equations , 2004 .

[4]  Paul G. Tucker,et al.  Computations of Wall Distances Based on Differential Equations , 2005 .

[5]  Edward N. Tinoco,et al.  Summary of the Fourth AIAA CFD Drag Prediction Workshop , 2010 .

[6]  Edward Tinoco,et al.  Drag Prediction with the Zeus/CFL3D System (Invited) , 2004 .

[7]  Dimitri J. Mavriplis,et al.  AIAA 99 – 0537 LARGE-SCALE PARALLEL UNSTRUCTURED MESH COMPUTATIONS FOR 3 D HIGH-LIFT ANALYSIS , 1999 .

[8]  Joseph H. Morrison,et al.  CFD Sensitivity Analysis of a Drag Prediction Workshop Wing/Body Transport Configuration , 2003 .

[9]  D. Wilcox.  Reassessment of the scale-determining equation for advanced turbulence models , 1988 .

[10]  Elizabeth M. Lee-Rausch,et al.  Application of Parallel Adjoint-Based Error Estimation and Anisotropic Grid Adaptation for Three-Dimensional Aerospace Configurations , 2005 .

[11]  S. Pirzadeh,et al.  Large-Scale Parallel Unstructured Mesh Computations for Three-Dimensional High-Lift Analysis , 1999 .

[12]  Neal T. Frink,et al.  Assessment of the Unstructured Grid Software TetrUSS for Drag Prediction of the DLR-F4 Configuration , 2002 .

[13]  Edward N. Tinoco,et al.  Summary of Data from the Second AIAA CFD Drag Prediction Workshop (Invited) , 2004 .

[14]  Dimitri J. Mavriplis,et al.  Grid Resolution Study of a Drag Prediction Workshop Configuration Using the NSU3D Unstructured Mesh Solver , 2005 .

[15]  Eiji Shima,et al.  CFD Sensitivity of Drag Prediction on DLR-F6 Configuration by Structured Method and Unstructured Method , 2004 .

[16]  John C. Vassberg,et al.  Summary of Data from the First AIAA CFD Drag Prediction Workshop , 2002 .

[17]  Dimitri J. Mavriplis,et al.  Transonic drag prediction using an unstructured multigrid solver , 2002 .

[18]  Dimitri J. Mavriplis,et al.  Transonic Drag Prediction on a DLR-F6 Transport Configuration Using Unstructured Grid Solvers , 2004 .

[19]  Mark A. DeHaan,et al.  A Wing-Body Fairing Design for the DLR-F6 Model: A DPW-III Case Study , 2005 .

[20]  J. Sethian,et al.  Fast methods for the Eikonal and related Hamilton- Jacobi equations on unstructured meshes. , 2000, Proceedings of the National Academy of Sciences of the United States of America.

[21]  V. Venkatakrishnan,et al.  A UNIFIED MULTIGRID SOLVER FOR THE NAVIER-STOKES EQUATIONS ON MIXED ELEMENT MESHES , 1995 .

[22]  Florian R. Menter,et al.  Drag Prediction of Engine-Airframe Interference Effects with CFX-5 , 2004 .

[23]  Olaf Brodersen,et al.  Airbus, ONERA, and DLR Results from the Second AIAA Drag Prediction Workshop , 2005 .

[24]  Shahyar Pirzadeh,et al.  Three-dimensional unstructured viscous grids by the advancing-layers method , 1996 .

[25]  John C. Vassberg,et al.  OVERFLOW Drag Prediction for the DLR-F6 Transport Configuration: A DPW-II Case Study , 2004 .

[26]  John C. Vassberg,et al.  Drag Prediction for the DLR-F4 Wing/Body using OVERFLOW and CFL3D on an Overset Mesh , 2002 .