Exporting shear stress data

January 16, 2004, 13:14

I want to obtain the values for shear stress. I´ve tried all available options of exporting data in the CFX Solver, with no success. There is another way to get this?

Thanks everybody.

January 18, 2004, 17:20

Hi Severo,

I you are looking for the wall shear stress there is a variable for that. Exporting wall shear stress should be easy. I have just noticed (to my surprise) that there is no preset variable for the full 3D shear stress field. It looks like in this case you will have to create the variable. Create an expression in Post to evaluate it from the velocity gradient.

Glenn

February 4, 2004, 07:11

Is velocity gradient availabe as a solved variable? Under what name?

Thanks

February 4, 2004, 19:54

Hi Drona,

It is accessible in CFX-Post. Press the "..." button next to the variable selector.

Glenn

February 5, 2004, 10:47

Glenn,

Thanks. So the shear stress for a turbulent flow is:

Tau (x,y,z) = Turbulent/effective viscosity * Velocity gradient(x,y,z) ????

Drona

January 16, 2004, 13:14	Exporting shear stress data	#1
Severo Neto Guest Posts: n/a	I want to obtain the values for shear stress. I´ve tried all available options of exporting data in the CFX Solver, with no success. There is another way to get this? Thanks everybody.

January 18, 2004, 17:20	Re: Exporting shear stress data	#2
Glenn Horrocks Guest Posts: n/a	Hi Severo, I you are looking for the wall shear stress there is a variable for that. Exporting wall shear stress should be easy. I have just noticed (to my surprise) that there is no preset variable for the full 3D shear stress field. It looks like in this case you will have to create the variable. Create an expression in Post to evaluate it from the velocity gradient. Glenn

February 4, 2004, 07:11	Re: Exporting shear stress data	#3
Drona Guest Posts: n/a	Is velocity gradient availabe as a solved variable? Under what name? Thanks

February 4, 2004, 19:54	Re: Exporting shear stress data	#4
Glenn Horrocks Guest Posts: n/a	Hi Drona, It is accessible in CFX-Post. Press the "..." button next to the variable selector. Glenn

February 5, 2004, 10:47	Re: Exporting shear stress data	#5
Drona Guest Posts: n/a	Glenn, Thanks. So the shear stress for a turbulent flow is: Tau (x,y,z) = Turbulent/effective viscosity * Velocity gradient(x,y,z) ???? Drona

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