Open AccessInvestigation of shock wave structure in CO2based on the continuum and DSMC approaches
Author(s) -
Elena Kustova,
Илья Владимирович Алексеев,
Lei Tan
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1959/1/012032
Subject(s) - shock wave , argon , vibrational temperature , kinetic energy , vibrational energy relaxation , thermodynamics , kinetic theory , physics , collision , shock (circulatory) , chemistry , boltzmann equation , mechanics , atomic physics , classical mechanics , excited state , medicine , computer security , computer science
A comparison is made between the continuum and kinetic approaches in studying the shock wave structure in argon, nitrogen, and carbon dioxide. Using the kinetic-theory methods, one-temperature and two-temperature fluid-dynamic equations are derived and closed. Calorically non-perfect gas model is applied, with vibrational energy explicitly calculated. The algorithm for the calculation of transport coefficients including bulk viscosity is implemented. For argon and nitrogen, a good agreement of the solutions obtained using both the continuum approach and direct statistical simulations (DSMC) with experimental results is shown. For carbon dioxide, the one-temperature Navier-Stokes equations do not reproduce non-monotonic temperature behaviour. The two–temperature model yields the results qualitatively similar to those given by DSMC; quantitative discrepancies are however significant. The DSMC relaxation rate strongly depends on the vibrational collision numbers in various CO 2 modes.