dynamic viscosity for sand

s_baghalian · November 8, 2010, 17:06

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

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

November 8, 2010, 17:06	dynamic viscosity for sand	#1
s_baghalian Member sara Join Date: Sep 2010 Posts: 33 Rep Power: 16	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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November 13, 2010, 06:10		#2
joey2007 Senior Member Join Date: Mar 2009 Location: Europe Posts: 169 Rep Power: 17	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.

November 13, 2010, 08:42		#3
s_baghalian Member sara Join Date: Sep 2010 Posts: 33 Rep Power: 16	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.