specularity coefficient shear boundary in Fluent

February 16, 2009, 22:51

There are two coefficients in johnoson and jackson boundary condition for the simulation of particle velocity at wall: restitution for particle-wall collisions and specularity factor. but only the specularity factor could be found in Fluent, why?

meangreen · February 12, 2010, 10:19

This is because you only defined the particle-wall coefficient of restitution in fluent when the full partial differential equation for the granular temperature (GT) is applied. No boundary conditions are needed for the algebraic GT equations is used. However, the specularity coefficient is needed for the momentum boundary condition so it will always be asked for.

coolgame2004 · March 25, 2014, 20:59

Quote:

Originally Posted by meangreen

This is because you only defined the particle-wall coefficient of restitution in fluent when the full partial differential equation for the granular temperature (GT) is applied. No boundary conditions are needed for the algebraic GT equations is used. However, the specularity coefficient is needed for the momentum boundary condition so it will always be asked for.

thanks a lot~

February 16, 2009, 22:51	specularity coefficient shear boundary in Fluent	#1
sdp Guest Posts: n/a	There are two coefficients in johnoson and jackson boundary condition for the simulation of particle velocity at wall: restitution for particle-wall collisions and specularity factor. but only the specularity factor could be found in Fluent, why?

February 12, 2010, 10:19		#2
meangreen Member Casey Join Date: Jun 2009 Posts: 98 Rep Power: 18	This is because you only defined the particle-wall coefficient of restitution in fluent when the full partial differential equation for the granular temperature (GT) is applied. No boundary conditions are needed for the algebraic GT equations is used. However, the specularity coefficient is needed for the momentum boundary condition so it will always be asked for. RaminM likes this.

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