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The usual equations solved in CFD calculations are for fluids known as Newtonian fluids, in which there is a simple linear relationship between the fluid stress and the velocity gradients in the fluid. However, many fluids used in the Process Industry, such as oils, paints and polymers, have more complex constitutive relations.
The ANSYS CFX software is especially good at calculating flows in non-Newtonian fluids in which the fluid stress is a complex function of the present velocity gradients. These fluids can be set up straightforwardly using the CFX Expression Language.
Metal extrusion through a die, using an inverse hyperbolic sine constitutive
relationship
coded through CEL - shear strain rate (above) and temperature (below).
