Low Rate Viscosity#

Low Rate Viscosity = CONSTANT <float> [M/Lt]

Description / Usage#

This card is used to specify the model for the low-rate viscosity parameter for the POWER_LAW, CARREAU, CARREAU_WLF, BINGHAM, SUSPENSION, THERMAL, CURE, EPOXY, FILLED_EPOXY, POWERLAW_SUSPENSION and CARREAU_SUSPENSION model options of the Liquid Constitutive Equation card. This is also the reference viscosity value in the HERSCHEL_BULKLEY constitutive equation.

Definitions of the input parameters are as follows:


Name of the model for the low-rate viscosity.

  • <float> - the value of the low-rate viscosity. This value is also called the zero strain-rate limit of the viscosity and in models is normally called μ0.


Name of the model for level-set dependent low-rate viscosity. Allows for this viscosity level to be a function of the level-set field. Specifically used for changing the low-rate viscosity from one constant value on the negative side of the interface to another constant value on the positive side. The model requires three floats:

  • <float1> - the value of viscosity in the negative regions of the level set function.

  • <float2> - the value of viscosity in the positive regioons of the level-set function.

  • <float3> Length scale over which the transition occurs. If this parameter is set to zero, it will default to one-half the Level-Set Length Scale value specified.


The following is a sample card that sets the low rate viscosity to 10:

Low Rate Viscosity = CONSTANT 10.

Technical Discussion#

See Description/Usage for Liquid Constitutive Equation card.


No References.