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dynamic viscosity for sand

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Old   November 8, 2010, 17:06
Default dynamic viscosity for sand
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sara
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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?
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Old   November 13, 2010, 06:10
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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.
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Old   November 13, 2010, 08:42
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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.
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