Towards the development of a hybrid statistical method for modeling reentry flows about blunt bodies

E. V. Titov, R. Kumar, D. A. Levin

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

Abstract

Non-equilibrium features of the reentry flows at moderately high altitudes between 95 and 80 km for a vehicle of a shape of the Crew Exploration Vehicle (CEV) were studied by Direct Simulation Monte Carlo Method (DSMC) and the Kolmogorov-Smirnov statistical test. The locations of the regions of non-equilibrium recognized by the test were compared with the locations of chemically active areas in the flow to establish the criteria for switching between different computational methods applied to different areas in the flow. Application of an accurate kinetic computational technique, such as DSMC is suggested for areas with strong non-equilibrium features and with active flow state chemistry. The near equilibrium as well as chemically inactive portions of the flow can be solved with either statistical BGK method or with CFD approaches. It was found that both thermal non-equilibrium portions of the flow as well as areas of active molecular nitrogen dissociation (chemical non-equilibrium) become narrower as the altitude decreases. An the same time, these two areas do not coincide making reliance on only one switching criteria problematic. A combined criterion that includes both the Kolmogoriov-Smirnov test and computed or estimated dissociation rates is suggested.

Original languageEnglish (US)
Title of host publication42nd AIAA Thermophysics Conference
StatePublished - Dec 1 2011
Externally publishedYes
Event42nd AIAA Thermophysics Conference 2011 - Honolulu, HI, United States
Duration: Jun 27 2011Jun 30 2011

Publication series

Name42nd AIAA Thermophysics Conference

Other

Other42nd AIAA Thermophysics Conference 2011
CountryUnited States
CityHonolulu, HI
Period6/27/116/30/11

ASJC Scopus subject areas

  • Aerospace Engineering
  • Mechanical Engineering
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Towards the development of a hybrid statistical method for modeling reentry flows about blunt bodies'. Together they form a unique fingerprint.

Cite this