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January 25, 2008, 04:43 |
Wall boundary condition – UDF
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Dear All,
I have gas-solid flow in 2D domain and would like to specify a wall boundary condition for solid phase. Radial velocity of particles should be zero at wall and for axial velocity there is a correlation; ----------------------------------------------------------- Up=(dp/Ep**0.333)*d(Up)/dr @ r=R dp=solid diameter Ep=solid holdup d(Up)/dr= partial derivation with respect to r ----------------------------------------------------------- I know that I should do it by UDF - coupled at specified shear panel. Parameters will be; Visco = C_Mu(cell,thread_g) y_vel_s = C_V (cell,thread_s) ->tangential velocity-to-wall diam = C_Phase_Diameter (cell, thread_s) void_g = C_VOF (cell, thread_g) ******************************* Shear = -Mu*dV/dr Shear stress y component; Shear_y = Visco*pow((1-void_g),(1/3))/diam*y_vel_s I don't know how to define shear stress x component? And also I am not sure if I can use the above shear definition at wall? Does anyone have an experience with this type of bc and UDF?? Regards, Ssn |
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