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VSS in a 2D Orifice Plate Model
Posted 19 dic 2017, 05:07 GMT-5 Fluid & Heat, Computational Fluid Dynamics (CFD), Results & Visualization Version 5.3 0 Replies
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Hello,
I’m validating a 2D orifice plate model with COMSOL. The resulting velocity field components of the time dependent laminar flow COMSOL-model correspond quite accurate to the given results of the FD-approach (relative error less than 3%), especially for the finest quadrilateral mesh.
By calculating the viscous shear stress with spf.mu(d(u,y)+d(v,x)) or similar with spf.K_stress_tensorxy the maximum and minimum valves rises extremely, when they are calculated in COMSOL directly. Those extreme high VSS-values are located at the edge of the gap inlet and rises with the mesh fineness.
How does COMSOL calculate the partial derivatives of the VSS?
Do I consider singularities? How to read out the “true” shear stress level?
Thanks, Patrice
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Hello Patrice Seifriz
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