What is it about?
This work explores applying output-based, or adjoint, grid adaptation--a common technique that aids in reducing numerical error in a given engineering metric--to a diffusing serpentine inlet geometry to demonstrate improved prediction of total pressure recovery surveyed at the Aerodynamic Interface Plane (AIP). Output based mesh adaptation results are compared with results computed on a set of workshop-supplied grids.
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Why is it important?
Results from the third Propulsion Aerodynamics Workshop showed a non-trivial amount of scatter in participants' results for predicting the flow through a diffusing serpentine inlet despite participants using a common set of workshop-supplied grids. This highlights the ongoing difficulty in accurately and reliably predicting these types of realistic internal flow applications by using CFD. Output-based grid adaptation is thought to be an important enabling technology for improved numerical prediction for computational fluid dynamics (CFD) applications, and this paper examines its effect for a representative propulsion aerodynamics geometry.
Perspectives
The use of grid adaptation will undoubtedly be an important component in accurately predicting engineering metrics of importance in the future. 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.
Zach Davis
Kratos Defense & Rocket Support Services
Read the Original
This page is a summary of: IFCPT S-Duct Grid-Adapted FUN3D Computations for the Third Propulsion Aerodynamics Workshop, July 2017, American Institute of Aeronautics and Astronautics (AIAA),
DOI: 10.2514/6.2017-4835.
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