**** Aexp **** :: Aexp = CONSTANT [] ----------------------- **Description / Usage** ----------------------- This card is used to specify the model for the Aexp parameter of the **CARREAU,BINGHAM, CARREAU_WLF** and **CARREAU_SUSPENSION** model options of the *Liquid Constitutive Equation* card. Definitions of the input parameters are as follows: +-----------------+---------------------------------------------------------------------------------------------------------+ |**CONSTANT** |Name of the model for Aexp. | | | | | | * - the value of the a exponent in the liquid constitutive models; also, a dimensionless | | | parameter that describes the transition between the low-rate and the power-law region for the Carreau | | | model (see Bird, et. al., 1987). | +-----------------+---------------------------------------------------------------------------------------------------------+ |**LEVEL_SET** |Name of the model for level-set dependent Aexp parameter. Allows for this parameter level to be a | | |function of the level-set field. Specifically used for changing the Aexp parameter from one constant | | |value on the negative side of the interface to another constant value on the positive side. The model | | |requires three floats: | | | | | | * - the value of Aexp parameter in the negative regions of the level set function. | | | * - the value of Aexp parramete in the positive regioons of the level-set function. | | | * 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. | +-----------------+---------------------------------------------------------------------------------------------------------+ ------------ **Examples** ------------ The following is a sample card that sets Aexp to 3.0: :: Aexp = CONSTANT 3.0 ------------------------- **Technical Discussion** ------------------------- See Description/Usage for *Liquid Constitutive Equation* card. -------------- **References** -------------- Bird, R. B., Armstrong, R. C., and Hassager, O. 1987. Dynamics of Polymeric Liquids, 2nd ed., Wiley, New York, Vol. 1.