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-   -   dynamic viscosity for sand (https://www.cfd-online.com/Forums/cfx/81843-dynamic-viscosity-sand.html)

s_baghalian November 8, 2010 17:06

dynamic viscosity for sand
 
hi
i am modeling channel with 3 phases (air+water+sediment). when i select depressed solid for sediment, one error occurred. it want a dynamic viscosity for sand that is material of sediment.
i don't know what value i should use.
is there method for calculate it? or what is the value of it?

joey2007 November 13, 2010 06:10

Guess you have defined sand as a solid. For a solid it is not reasonable to define a dynamic viscosity. Subsequently CFX does not allow it.

To solve your problem you have to think about your physics and how to model it.

s_baghalian November 13, 2010 08:42

hi
sand is not defined in material, because of it i defined it. in definition of sand, it don't need dynamic viscosity but when i select depressed solid for sand, CFX need dynamic viscosity for it.

civil karthik November 15, 2016 09:35

Quote:

Originally Posted by s_baghalian (Post 283323)
hi
sand is not defined in material, because of it i defined it. in definition of sand, it don't need dynamic viscosity but when i select depressed solid for sand, CFX need dynamic viscosity for it.


I also need that viscosity of sand for creating new inert material for injection of eulerian multiphase flow but i don't know how to get it or measure it


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