What is it about?
Mesh adaptation techniques today don't leverage the underlying geometry, and grid adaptation schemes are not robust in adapting anisotropic cells typically used near curved wall boundaries to resolve the viscous boundary layer. Therefore current mesh adaptation implementations are limited to off-body adaptation only. This paper discusses a method that was developed to include surface and near-body output-based mesh adaptation by leveraging existing CFD tools and technologies.
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Why is it important?
The use of grid adaptation is an important component in accurately predicting engineering metrics of importance. The ability to automatically add grid resolution in areas of the flow field where it is needed removes the need for often time-consuming, human-driven mesh generation and economizes computational resources. The technique this paper describes shows a reduction in the computational time needed to reduce the remaining error threshold in a given output functional to a specified threshold value by including the near-body and surface grid in the output-based mesh adaptation process.
Perspectives
NASA's CFD Vision 2030 study has lamented the lack of coupling of existing CFD solvers today with the underlying CAD definition. Users spend a substantial amount of time building computational grids which include this geometry definition, but this analytical geometry is then just discarded during simulation. Being able to leverage this geometry information in applications like output-based grid adaptation where it can be used for projecting points to the surface after a new target grid spacing has been computed helps demonstrate the value in this capability.
Zach Davis
Kratos Defense & Rocket Support Services
Read the Original
This page is a summary of: Reducing the Computational Cost of Viscous Mesh Adaptation, June 2017, American Institute of Aeronautics and Astronautics (AIAA),
DOI: 10.2514/6.2017-3109.
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