Effective Boundary Conditions for Continuum Method of Investigation of Rarefied Gas Flow over Blunt Bodyстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Super- and hypersonic rarefied gas flow over blunt bodies is investigated by using asymptotically correct viscous shock layer (VSL) model with effective boundary conditions and thin viscous shock layer model. Correct shock and wall conditions for VSL are proposed with taking into account terms due to the curvature which are significant at low Reynolds number. These conditions improve original Davis’s VSL model. Numerical calculation of Krook kinetic equation is carried out to verify continuum results. Continuum numerical and asymptotic solutions are compared with kinetic solution, free-molecule flow solution and with DSMC solutions over a wide range of free-stream Knudsen number. It is shown that taking into account terms with shock and surface curvatures have a pronounced effect on skin friction and heat-transfer in transitional flow regime. Using the asymptotically correct VSL model with effective boundary conditions significantly extends the range of its applicability to higher Knudsen numbers.