Disable Viscosity Sensitivities

Disable Viscosity Sensitivities = {yes | no}

Description / Usage

This optional card permits the analyst to omit the sensitivities of a shear-thinning viscosity model with respect to shear rate from the Jacobian.Valid options for this card are

yes

Omit the sensitivities of a shear-thinning viscosity model with respect to shear rate from the Jacobian

no

Form the complete Jacobian.

Currently, this card will have an effect only when using the following viscosity models: POWER_LAW, CARREAU, BINGHAM (see the Liquid Constitutive Equation card).

The default value is no.

Examples

The following is a sample card:

Disable Viscosity Sensitivities = yes

Technical Discussion

It has been observed that when these terms are included for very highly shear-thinning models the result can be non-convergence. In such situations, disabling these terms can often result in a convergent answer but at a convergence rate far less than the usual quadratic.