Fixed Grid RANS Results and Turbulence Model Investigation using Simcenter STAR-CCM+ for 4<sup>th</sup> AIAA CFD High Lift Prediction Workshop

Zastawny, Marian; Hanke, Jeremy L.; Nelson, Chris

doi:10.2514/6.2022-3746

Cited by 3 publications

References 14 publications

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Fourth High-Lift Prediction/Third Geometry and Mesh Generation Workshops: Overview and Summary

Rumsey

Slotnick

Woeber

2023

Journal of Aircraft

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The Fourth AIAA Computational Fluid Dynamics (CFD) High Lift Prediction Workshop and the Third Geometry and Mesh Generation Workshop were held collaboratively with the common goal of assessing the numerical prediction capability of current-generation computational fluid dynamics technology for swept medium-/high-aspect-ratio wings in high-lift configurations. A key aspect of this joint endeavor was the use of technology focus groups: an innovative new approach for workshops involving close collaboration between participants. These groups, which included both mesh-generation and flow-solver experts, worked to accelerate advancements for their particular methodologies by addressing key questions of importance before the workshop. The high-lift version of the NASA Common Research Model (CRM-HL) configuration was the focus of this workshop. Measured experimental wind-tunnel data were available for comparison. The workshop also included a two-dimensional turbulence model verification exercise based on the CRM-HL wing shape. Altogether, 44 participants submitted a total of 184 datasets of CFD results. This paper provides a high-level summary of the results and conclusions from the workshop. Like at past workshops, fixed-grid Reynolds-averaged Navier–Stokes methods continued to be inaccurate and inconsistent for predicting high-lift flow physics near maximum lift conditions. However, mesh adaptation definitively brought more consistency. Scale-resolving methods appeared most promising for predicting high-lift flow physics near maximum lift.

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Fourth High-Lift Prediction/Third Geometry and Mesh Generation Workshops: Overview and Summary

Rumsey

Slotnick

Woeber

2023

Journal of Aircraft

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Fourth AIAA High-Lift Prediction Workshop: Fixed-Grid Reynolds-Averaged Navier–Stokes Summary

Ollivier‐Gooch

Coder

2023

Journal of Aircraft

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The current state-of-the-practice technology for high-lift aerodynamic simulations is to solve the Reynolds-averaged Navier–Stokes (RANS) equations on a fixed grid or a refinement sequence of fixed grids. The Fixed-Grid Reynolds-Averaged Navier–Stokes Technology Focus Group set out to determine meshing requirements and best practices, whether RANS can accurately predict the change in aerodynamic performance with changes in flap deflection, whether RANS modeling can produce accurate results near [Formula: see text], and the effects of underconvergence and solution strategy on computed results. Eighteen groups of participants submitted over 100 datasets. Challenges with grid convergence and iterative convergence made it impossible to definitively answer all the questions we had posed. Despite this, we can conclude that meshes with at least half a billion cells (more than one billion degrees of freedom) are required for grid convergence away from stall; that RANS simulations cannot currently be reliably used to predict aerodynamic coefficients near stall, nor changes in coefficients with changes in flap angle; that iterative underconvergence remains a significant source of uncertainty in outputs; and that solution initialization can have an important effect on solution behavior, including flow separation patterns.

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Geometry Preparation and Mesh Generation Using Simcenter STAR-CCM+ for 4^th AIAA CFD High Lift Prediction Workshop

Hanke

2022

AIAA AVIATION 2022 Forum

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Fixed Grid RANS Results and Turbulence Model Investigation using Simcenter STAR-CCM+ for 4^th AIAA CFD High Lift Prediction Workshop

Cited by 3 publications

References 14 publications

Fourth High-Lift Prediction/Third Geometry and Mesh Generation Workshops: Overview and Summary

Fourth High-Lift Prediction/Third Geometry and Mesh Generation Workshops: Overview and Summary

Fourth AIAA High-Lift Prediction Workshop: Fixed-Grid Reynolds-Averaged Navier–Stokes Summary

Geometry Preparation and Mesh Generation Using Simcenter STAR-CCM+ for 4^th AIAA CFD High Lift Prediction Workshop

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Fixed Grid RANS Results and Turbulence Model Investigation using Simcenter STAR-CCM+ for 4th AIAA CFD High Lift Prediction Workshop

Cited by 3 publications

References 14 publications

Fourth High-Lift Prediction/Third Geometry and Mesh Generation Workshops: Overview and Summary

Fourth High-Lift Prediction/Third Geometry and Mesh Generation Workshops: Overview and Summary

Fourth AIAA High-Lift Prediction Workshop: Fixed-Grid Reynolds-Averaged Navier–Stokes Summary

Geometry Preparation and Mesh Generation Using Simcenter STAR-CCM+ for 4th AIAA CFD High Lift Prediction Workshop

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Product

Resources

About

Fixed Grid RANS Results and Turbulence Model Investigation using Simcenter STAR-CCM+ for 4^th AIAA CFD High Lift Prediction Workshop

Geometry Preparation and Mesh Generation Using Simcenter STAR-CCM+ for 4^th AIAA CFD High Lift Prediction Workshop