Viscoelastic Flow: Poor Convergence, high Weissenberg number, Electroosmosis

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Has anyone else encountered the same problem?

I know other CFD tools, e.g., OpenFOAM (RheoTool), use log conformation to deal with high Weissenberg numbers. How does COMSOL handle high Weissenberg numbers?

I am trying to model electroosmosis using OB model. My model does not converge, even in a simple straight channel. I believe the issue is not related to the mesh or solver configuration.


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