Material Calibration: Curve Fitting Non-Newtonian Model Parameters

This tutorial illustrates the workflow for calibrating rheological model parameters from experimental rheological data through curve-fitting.

Experimentally, the rheological response of non-Newtonian fluids is characterized by a set of linear tests such as Small Amplitude Oscillatory Shear (SAOS) G and G" vs. angular frequency, and non-linear tests, such as shear viscosity vs. shear rate. In Simcenter STAR-CCM+, non-Newtonian fluids are numerically modeled by either generalized Newtonian fluid models or viscoelastic fluid models.

You supply the experimental data as tables to the Fitting Tool option of the Material Calibration model. You then direct a curve-fitting process for the data. At the end of the process, the results specify material properties for the selective constitutive equation for the viscous flow.

This tutorial has three sections:
  • In the first section, you calibrate for a Generalized Newtonian model, using the Power Law model.
  • In the second section, you calibrate for a curing application using the Chemorheology model.
  • In the third section, you calibrate the single- and multi-mode eXtended Pom-Pom model parameters using the experimental rheological data.