Restitution coefficient wall

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 November 29, 2011, 13:47 Restitution coefficient wall #1 New Member   naor Join Date: Oct 2010 Posts: 18 Rep Power: 7 hello how i specify Restitution coefficient wall ?? thanks

 November 30, 2011, 00:42 #2 Member   Join Date: Oct 2011 Posts: 37 Rep Power: 6 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:How to define particle-wall restitution coefficient in Eulerian multiphase model ?)

 November 30, 2011, 15:18 #3 New Member   naor Join Date: Oct 2010 Posts: 18 Rep Power: 7 thank u!!!! but now how can i define the granular temp?

 December 1, 2011, 20:36 #4 Member   Join Date: Oct 2011 Posts: 37 Rep Power: 6 hi. do you mean the value of granular temperature? you can take the default value 0.0001 .

 December 2, 2011, 03:07 #5 New Member   naor Join Date: Oct 2010 Posts: 18 Rep Power: 7 yea, but i have a value and i dont see were to put it...

 December 2, 2011, 05:29 #6 Member   Join Date: Oct 2011 Posts: 37 Rep Power: 6 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.

 December 2, 2011, 09:11 #7 New Member   naor Join Date: Oct 2010 Posts: 18 Rep Power: 7 i will try and let u know thank u for the help and quick answers.

 December 18, 2011, 12:54 #8 New Member   naor Join Date: Oct 2010 Posts: 18 Rep Power: 7 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?

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