Unstructured grid approaches for accurate aeroheating simulations

Graham V. Candler, Michael D. Barnhardt, Travis W. Drayna, Ioannis Nompelis, David M. Peterson, Pramod Subbareddy

Research output: Chapter in Book/Report/Conference proceedingConference contribution

29 Scopus citations

Abstract

The use of tetrahedral, prismatic, and hybrid hexahedral-prismatic- tetrahedral grids for the accurate prediction of aerodynamic heating at hypersonic conditions is investigated. We find that tetrahedral grids introduce significant error in the vicinity of strong shock waves, which results in unacceptable aeroheating predictions. The source of this error is studied with an idealized model, and it is found that a large spurious component of post-shock velocity is generated by triangular and tetrahedral elements. This type error is much smaller and easier to control on quadrilateral or hexahedral grids. Thus, we are very skeptical about the utility of tetrahedral grids for accurate hypersonic aeroheating predictions. Several comparisons of heating predictions for a three-dimensional sphere are made, and it is found that the stagnation region results are very sensitive to the grid design. Based on this work and our experience, we advocate the use of unstructured hexahedral grids which increase the grid design space, reduce the element count for many geometries, and result in accurate aeroheating predictions.

Original languageEnglish (US)
Title of host publicationCollection of Technical Papers - 18th AIAA Computational Fluid Dynamics Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
Pages565-580
Number of pages16
ISBN (Print)1563478994, 9781563478994
DOIs
StatePublished - 2007
Event18th AIAA Computational Fluid Dynamics Conference - Miami, FL, United States
Duration: Jun 25 2007Jun 28 2007

Publication series

NameCollection of Technical Papers - 18th AIAA Computational Fluid Dynamics Conference
Volume1

Other

Other18th AIAA Computational Fluid Dynamics Conference
CountryUnited States
CityMiami, FL
Period6/25/076/28/07

Fingerprint Dive into the research topics of 'Unstructured grid approaches for accurate aeroheating simulations'. Together they form a unique fingerprint.

Cite this