Alexis CAS, Celine BARANGER, Héloïse BEAUGENDRE, Simon PELUCHON

DOI Number: N/A

Conference number: HiSST-2025-236

During atmospheric hypersonic re-entry, the heat distribution within the thermal protection system (TPS) is dampened by the in-depth chemical degradation of materials – called pyrolysis -, and by a surface physico-chemical degradation – called ablation. The aim of this work is to investigate the numerical tools used to solve the thermal pyrolysis response of heat shield. First, an overview of macroscopic modeling of pyrolysis will be done. Arrhenius laws are employed in the modeling of density variation. Swelling or shrinkage are taken into account as a consequence of material degradation. This analysis will explore a number of numerical methods, with a focus on conservation properties and method efficiency. Finally, Henderson’s experimental test case is studied, in order to validate and compare the numerical methods. The simulation results are in reasonable agreement with the experimental data. Some numerical methods result in a trade-off between mass or energy conservation and a faster computation time.

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In Categories: 1.Events, 1.HiSST 2025, High-Speed Aerodynamics and Aerothermodynamics with application to hypersonic regimes
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