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Custom shear stress function from active force

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Old   April 21, 2022, 09:01
Question Custom shear stress function from active force
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Dan Woods
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Hi,

I'm trying to model a 2D coaxial cylinder rheometer. This involves a rotating outer cylinder and stationary inner cylinder.
I want to record shear stress on the inner cylinder surface but the viscous flow model I'm using does not support the wall shear stress function. There is, however, the ActiveForce function which seems to give the force exerted on the boundary by the fluid.

How would I go about converting this into shear stress in a custom function? Is it possible to dot product ActiveForce with the inner cylinder tangent vector? If so why wouldn't STAR-CCM+ provide a wall shear stress function in the viscous flow model?

Any help appreciated, thanks.
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field function, shear stress, viscous flow

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