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Defining friction between wall and fluid

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Old   June 6, 2018, 12:43
Default Defining friction between wall and fluid
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Hi guys,

my simulation contains walls which move in an environment which is filled with two different phases.

When I edit the properties of the wall "shear condition", the default setting is always "no slip". However, I would like to define a certain amount of friction between the wall and the surrounding fluids. So how do I do that?

Has the function "specifying shear stress" anything to do with it?

Ansys manuel says the following:

"In addition to the no-slip wall that is the default for viscous flows, you can model a slip wall by specifying zero or non-zero shear. For non-zero shear, the shear to be specified is the shear at the wall by the fluid."

So what I do with this function, is basically defining a certain value of shear stress which is present between the wall and the surrounding fluid?

I am a little bit confused at this point..

Thanks in advance for any insights on this!
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Old   June 6, 2018, 15:33
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Yes you specify the shear. What is the confusion? The benefit of having things written down in text is that you can always go back to reread it.
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Old   June 7, 2018, 15:48
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Hi LuckyTran,

my simulation has two different phases in it. So wouldn´t I have to define two different shear stresses for the phases in order to define the frictional interaction between fluid 1 and fluid 2 and my wall?

Or is the kind of the fluid which is surrounding the wall completely irrelevant, as the chosen shear stress would be used for any wall/fluid interaction, no matter which fluid is in contact with the wall?
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