Development of a two-dimensional binning model for N2-N relaxation in hypersonic shock conditions

Tong Zhu, Zheng Li, Deborah A. Levin

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

Abstract

A high fidelity internal energy relaxation model for N2-N suitable for use in direct simulation Monte Carlo (DSMC) modeling of chemically reacting flows is proposed. A novel two-dimensional binning approach with variable bin energy resolutions in the rotational and vibrational modes is developed for treating the internal mode of N2. Both bin-to-bin and state-specific relaxation cross sections are obtained using the MD/QCT method with two potential energy surfaces as well as the state-specific database of Jaffe et al. The MD/QCT simulations of inelastic energy exchange between N2 and N also show that the VSS model is much better in capturing the forward-preferential scattering behavior in collisions at hypersonic conditions. The 99 bin model is used in homogeneous DSMC relaxation simulations and is found to be able to recover the state-specific master equation results of Panesi et al. when the Jaffe state-specific cross sections are used. Rotational relaxation energy profiles and relaxation times obtained using the ReaxFF and Jaffe PESs are in general agreement but there are larger differences between the vibrational relaxation times. These differences become smaller as the translational temperature increases because the difference in the PES energy barrier becomes less important.

Original languageEnglish (US)
Title of host publication46th AIAA Thermophysics Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624104350
StatePublished - Jan 1 2016
Event46th AIAA Thermophysics Conference, 2016 - Washington, United States
Duration: Jun 13 2016Jun 17 2016

Publication series

Name46th AIAA Thermophysics Conference

Other

Other46th AIAA Thermophysics Conference, 2016
CountryUnited States
CityWashington
Period6/13/166/17/16

ASJC Scopus subject areas

  • Aerospace Engineering
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Development of a two-dimensional binning model for N<sub>2</sub>-N relaxation in hypersonic shock conditions'. Together they form a unique fingerprint.

  • Cite this

    Zhu, T., Li, Z., & Levin, D. A. (2016). Development of a two-dimensional binning model for N2-N relaxation in hypersonic shock conditions. In 46th AIAA Thermophysics Conference (46th AIAA Thermophysics Conference). American Institute of Aeronautics and Astronautics Inc, AIAA.