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First of all, if non-linearities are involved, such as shear-rate dependence viscosity, it is always a good idea to check the convergence.
Next, when the mini-element with linear pressure interpolation is used, a stabilization term is needed for preventing the development of pressure modes. This additional term is weighted by a coefficient whose default value is 0.01. It can be changed via the item "Advanced options" in the Interpolation menu; a value of 0.001 can be selected. It is advised to consider a non-zero value.
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