************* Time Constant ************* :: Time Constant = CONSTANT [t] ----------------------- **Description / Usage** ----------------------- This card is used to specify the model for the time constant parameter of the **CARREAU, BINGHAM, CARREAU_WLF** and **CARREAU_SUSPENSION** fluid options of the *Liquid Constitutive Equation* card. Definitions of the input parameters are as follows: +-----------------+---------------------------------------------------------------------------------------------------------+ |**CONSTANT** |Name of the model for the time constant. | | | | | | * - the value of the time constant, λ. | +-----------------+---------------------------------------------------------------------------------------------------------+ |**LEVEL_SET** |Name of the model for level-set dependent time constant. Allows for this time constant level to be a | | |function of the level-set field. Specifically used for changing the time constant 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 time constant in the negative regions of the level set function. | | | * - the value of time constant 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 the time constant to 0.2. :: Time Constant = CONSTANT 0.2 ------------------------- **Technical Discussion** ------------------------- See Description/Usage for *Liquid Constitutive Equation* card.