Once you have specified the type of fluid model you want to fit (as described in Selecting the Type of Fluid Model), follow the steps below to set the initial values for the material parameters. See Material Data Parameters for details about the material parameters for different viscosity models.
Click Material Data in the top-level Ansys Polymat menu.
Material Data
Click the menu item for the material property you want to specify (for example, Shear-rate dependence of viscosity).
Choose the desired law (for example, Bird-Carreau law).
Click the parameter to be set (for example, Modify fac), and enter the initial value.
Click Upper level menu.
Repeat the previous two steps to define initial values for the other parameters.
When you have set initial values for all of the relevant material parameters, click Upper level menu twice to return to the Material Data menu.
If relevant, click the menu item for the next material property you want to specify (for example, Temperature dependence of viscosity), and follow the same procedure for selecting the desired law and setting the related initial values.
(optional) Specify values for any other relevant properties (for example, Density or Thermal conductivity). Note that these values will have no effect on the fitting procedure, but setting them will allow you to save a material data file containing a full description of the fluid model.
Click Upper level menu to return to the top-level Ansys Polymat menu.