Restitution coefficient wall
 

hello how i specify Restitution coefficient wall ??
thanks

hi. if you working on multiphase flow using Eulerian model you proceed like this:

define -> phases, select secondary phase, set and set Granular Temperature Model to Partial Differential Equation

now you can set coefficient of restitution under Boundary Conditions, wall (for second phase) under multiphase.

(source:http://www.cfd-online.com/Forums/flu...ase-model.html)

thank u!!!!
but now how can i define the granular temp?

hi. do you mean the value of granular temperature?
you can take the default value 0.0001 .

yea, but i have a value and i dont see were to put it...

hi.
like this : boundary condition -->inlet-->secondary phase--> momentum
you find granular temperature=0.0001
boundary condition -->outlet-->secondary phase-->multiphase
you find back flow granular temperature=0.0001
i hope this will help you.

i will try and let u know :)

thank u for the help and quick answers.

ok i tried it, but it strange i still cant se the difference.
i use an Eulerian model, and when i try to increased the volume fraction (B.C->velocity inlet-> volume fraction)

to 0.02, and make the initialized i get the next massage (before the running of the calc):
"turbulent viscosity limited to viscosity ratio of 1.00 e+5 in 27915 cells"

what it mean? do E model have a limit of volume fraction?