title: DSMC simulation and experimental validation of shock interaction in hypersonic low density flow.
abstract: Direct simulation Monte Carlo (DSMC) of shock interaction in hypersonic low density flow is developed. Three collision molecular models, including hard sphere (HS), variable hard sphere (VHS), and variable soft sphere (VSS), are employed in the DSMC study. The simulations of double-cone and Edney's type IV hypersonic shock interactions in low density flow are performed. Comparisons between DSMC and experimental data are conducted. Investigation of the double-cone hypersonic flow shows that three collision molecular models can predict the trend of pressure coefficient and the Stanton number. HS model shows the best agreement between DSMC simulation and experiment among three collision molecular models. Also, it shows that the agreement between DSMC and experiment is generally good for HS and VHS models in Edney's type IV shock interaction. However, it fails in the VSS model. Both double-cone and Edney's type IV shock interaction simulations show that the DSMC errors depend on the Knudsen number and the models employed for intermolecular interaction. With the increase in the Knudsen number, the DSMC error is decreased. The error is the smallest in HS compared with those in the VHS and VSS models. When the Knudsen number is in the level of 10(-4), the DSMC errors, for pressure coefficient, the Stanton number, and the scale of interaction region, are controlled within 10%.
authors.affiliation: School of Power and Energy, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China.
authors.forename: Hong
authors.identifier: 0000-0001-5423-2622
authors.initials: H
authors.lastname: Xiao
authors.affiliation: School of Power and Energy, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China.
authors.forename: Yuhe
authors.identifier: 0000-0003-1264-5714
authors.initials: Y
authors.lastname: Shang
authors.affiliation: School of Power and Energy, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China.
authors.forename: Di
authors.identifier: 0000-0003-4780-1051
authors.initials: D
authors.lastname: Wu
mesh_terms: D009010:Monte Carlo Method