The present paper aims to analyze the effects of the diffusion transport properties and chemical kinetics on two-dimensional hypersonic flow in the near-continuum regime. We simulate a five species air mixture with different free stream conditions using both US3D, a code routinely used for complex hypersonic computational fluid dynamics (CFD) simulations, and MGDS, a code capable of large-scale 3D Direct simulation Monte Carlo (DSMC) calculations. We study the effect of the reactions through the comparison between the Park model, the Modified Marrone-Treanor chemical kinetics model, available in US3D, and the total collision energy model, available in MGDS. We observed intriguing discrepancies in the near-wall region. Therefore, we quantify the diffusive transport terms and identify the leading diffusive phenomena. Furthermore, we implemented the transport properties derived from the Chapman-Enskog method for a multi-component mixture and repeated the same test case. All the CFD simulations neglect the thermal diffusion term, which we have found are not negligible at these conditions.
|Original language||English (US)|
|Title of host publication||AIAA Scitech 2021 Forum|
|Publisher||American Institute of Aeronautics and Astronautics Inc, AIAA|
|Number of pages||15|
|State||Published - 2021|
|Event||AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2021 - Virtual, Online|
Duration: Jan 11 2021 → Jan 15 2021
|Name||AIAA Scitech 2021 Forum|
|Conference||AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2021|
|Period||1/11/21 → 1/15/21|
Bibliographical noteFunding Information:
This research was supported by the Air Force Office of Scientific Research (AFOSR) under grant numbers FA9550-17-1-0250 and FA9550-19-1-0219. The view and conclusions contained herein are those of the authors and should not be interpreted as necessarily representing the official policies or endorsements, either expressed or implied, of the AFOSR or the US government.
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