Ansys Polymat offers two types of fitting for material data: a non-automatic method and an automatic method. The non-automatic method allows you to perform an in-depth analysis of the properties of a fluid material. If you use the non-automatic method, you can easily perform a sensitivity analysis of the basic viscometric and elongational properties with respect to several parameters. The automatic method is useful for cases where you are primarily interested in directly obtaining the material parameters for a given fluid. Both methods are available for almost all types of models: generalized Newtonian, differential viscoelastic, integral viscoelastic, and simplified viscoelastic.
There are, however, the following limitations:
For the simplified viscoelastic model, only the Newtonian part of the model can be fitted (the rheometric curves evaluated by Ansys Polymat are not recognized by the additional viscoelastic term of the model).
For the new differential viscoelastic Leonov model, the fitting is not allowed because the computation of the rheometric curves are not yet implemented.
The procedures you need to follow to use the non-automatic and automatic methods are presented in Non-Automatic Fitting and Automatic Fitting, respectively. Details about the inputs for individual fluid models (for example, Bird-Carreau law) are provided in Material Data Parameters, descriptions of the rheological properties for which you can perform fitting are provided in Rheological Properties, and information about controlling the graphical display of the data curves is provided in Defining and Plotting Curves.