Modeling Near-Continuum Flows Using the HyCFS Software Complex
T.Yu. Shkredov1,2, G.V. Shoev1, A.A. Shershnev1, A.N. Kudryavtsev1,2
1Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia
2St. Petersburg State University, St. Petersburg, Russia
Keywords: Maxwell slip, temperature jump, numerical methods, computational fluid dynamics, Navier-Stokes equations
Abstract
Results of the implementation and application of adiabatic and isothermal wall boundary conditions with slip and temperature jump in the computational code HyCFS-R for modeling near-continuum flows are presented. Validation was performed on problems with external and internal flows. As an external flow, the flow around a T2-97 cylinder with a skirt was selected; as an internal flow, the propagation of a shock wave in a long tube and the flow in a nozzle at low Reynolds numbers were considered. It was found that, in the case of flow around a cylinder with a skirt, the implementation of the slip boundary condition provides better agreement with experimental data on separation and reattachment points than the no-slip condition. It was shown that, in the calculation with the slip boundary condition, the shock wave propagates along the long tube faster than in the calculation with the no-slip condition. The calculated shock wave propagation velocities are in satisfactory agreement with experimental data. In the case of gas ejection from a nozzle, the use of the slip boundary condition leads to better agreement between the calculated and experimental temperature distributions along the surface.
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