Second Level Set Viscosity#

Second Level Set Viscosity = {model_name} {float_list} {char_string} [M/Lt]

Description / Usage#

This card allows to the user to specify a second viscosity model that will be applied to one side of a level set interfacial curve:


The name of the viscosity model can only be CONSTANT at the current time.


This is a single float parameter which is the value of Newtonian viscosity applied to the second level set. phase fluid.


This string may take the values POSITIVE or NEGATIVE. It identifies which side of the interface the preceding viscosity model is applied to.

This card allows the user to apply one of the several complex viscosity models currently available in Goma to one side of the interface while the other side recieves the constant viscosity value listed on this card. The side of the interface that corresponds to char_string appearing on this card recieves the constant viscosity value. The opposite sides viscosity is determined from the other, more complex model. Transition between them is accomplished using smooth Heaviside functions whose width is given on the Level Set Length Scale card. Note that it is the prescence of the this card in the material file that actually activates this selection process.


The following is a usage example for this card:

Liquid Constitutive Equation = HERSCHEL_BULKLEY
Low Rate Viscosity = CONSTANT 10000
Power Law Exponent = CONSTANT 0.6
Yield Stress = CONSTANT 1.e6
Second Level Set Viscosity = CONSTANT. 1.0 POSITIVE

This setup will cause the negattive side of the interface to receive viscosity values obtained from the HERSCHEL_BULKLEY model with the parameters listed above . The positive side of the interface will show a constant viscosity of 1.0.

Technical Discussion#

No Discussion.


No References.