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[FAQ]

The shear rates are clipped using the minimum and maximum shear rate parameters. The solver then calculates a viscosity based on these clipped values. This ensures the viscosity does not become infinite at zero shear rate; it will just approach the limiting value at the minimum shear rate. The same thing will happen at the high end of the range. In practice, most polymers approach Newtonian behavior at low and high shear rates, which this implementation should model properly. The yield stress will be used as the equations indicate. Since the shear rate is clipped to a minimum value, no testing is required to see if the shear stress lies above a certain value for deformation, and a minimum shear rate will always be used in the calculation.