Simulation of Graphite Ablation using an Overset Near Body Solver on an Adaptive Block-Structured Cartesian Off-Body Grid

Joel A. McQuaid, Aleksander L. Zibitsker, Alexandre Martin, Christoph Brehm

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

7 Scopus citations

Abstract

The simulation of ablative environments provides a number of challenges for numerical methods such as accurate predictions of surface heating loads, shock tracking as the geometric shape changes, and the need to generate high-quality near-wall grids. For accurate heat flux predictions, the proposed solver in this work employs the CHAMPS Cartesian grid solver to simulate the flow around re-entry vehicles while adaptive mesh refinement is used for shock and wake structure tracking. This approach allows for highly automated simulations that only require the geometric surface triangulation as an input. However, the inability to use high aspect ratio cells to efficiently resolve boundary layer gradients has rendered Cartesian solvers infeasible for this application due to the large computational expense needed to fully resolve near-wall gradients. Therefore, the Cartesian solver used here has been coupled to a body-conformal near body solver such that the near-wall gradient is captured accurately and efficiently while maintaining the advantage of automatic grid generation. This new solver is validated for use in high-enthalpy flows and is able to accurately capture thermo-chemical non-equilibrium effects as well as surface heating loads. The proposed solver is then coupled to the KATS material response solver to simulate steady-state graphite ablation for a blunt cone on a ballistic re-entry into Earth. The coupling of the two solvers is fully parallelized and designed to be compatible with non-conformal grids at the geometry surface.

Original languageEnglish
Title of host publicationAIAA AVIATION 2022 Forum
DOIs
StatePublished - 2022
EventAIAA AVIATION 2022 Forum - Chicago, United States
Duration: Jun 27 2022Jul 1 2022

Publication series

NameAIAA AVIATION 2022 Forum

Conference

ConferenceAIAA AVIATION 2022 Forum
Country/TerritoryUnited States
CityChicago
Period6/27/227/1/22

Bibliographical note

Publisher Copyright:
© 2022, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Nuclear Energy and Engineering
  • Aerospace Engineering

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