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A computational study of inviscid hypersonic flows using energy relaxation method

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Title A computational study of inviscid hypersonic flows using energy relaxation method
 
Creator NAGDEWE, S
SHEVARE, GR
KIM, HD
 
Subject hyperbolic conservation-laws
stiff relaxation
numerical schemes
terms
systems
hypersonic flows
energy relaxation method
ausm
relaxation time
 
Description Reasonable analysis of hypersonic flows requires a thermodynamic non-equilibrium model to properly simulate strong shock waves or high pressure and temperature states in the flow field. The energy relaxation method (ERM) has been used to model such a non-equilibrium effect which is generally expressed as a hyperbolic system of equations with a stiff relaxation source term. Relaxation time that is multiplied with source terms is responsible for non-equilibrium in the system. In the present study, a numerical analysis has been carried out with varying values of relaxation time for several hypersonic flows with AUSM (advection upstream splitting method) as a numerical scheme. Vibration modes of thermodynamic nonequilibrium effects are considered. The results obtained showed that, as the relaxation time reduces to zero, the solution marches toward equilibrium, while it shows non-equilibrium effects, as the relaxation time increases. The present computations predicted the experiment results of hypersonic flows with good accuracy. The work carried out suggests that the present energy relaxation method can be robust for analysis of hypersonic flows.
 
Publisher KOREAN SOC MECHANICAL ENGINEERS
 
Date 2011-08-17T11:34:42Z
2011-12-26T12:55:31Z
2011-12-27T05:40:53Z
2011-08-17T11:34:42Z
2011-12-26T12:55:31Z
2011-12-27T05:40:53Z
2008
 
Type Article
 
Identifier JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY, 22(6), 1213-1221
1738-494X
http://dx.doi.org/10.1007/s12206-008-0208-0
http://dspace.library.iitb.ac.in/xmlui/handle/10054/9850
http://hdl.handle.net/10054/9850
 
Language en