For generalized Newtonian flow, Ansys Polyflow can calculate the extra-stress tensor
on the part of the domain where the velocity field has been
calculated. Three components of the inelastic stress tensor will be calculated for 2D
planar cases, four components for 2D axisymmetric cases, and six components for all
other cases.
The procedure for specifying the calculation of the inelastic stress tensor is as follows:
Create a new sub-task.
Create a sub-task
Select Postprocessor as the sub-task type.
Postprocessor
When prompted, enter a name for the postprocessor sub-task.
In the F.E.M. Task Postprocessor menu, select Inelastic stress tensor.
Inelastic stress tensor
Ansys Polydata will tell you where the calculation will be performed. You can click to continue.
Specify any additional outputs that you want for the inelastic stress tensor. Ansys Polyflow calculates all of the tensor components by default. To specify the calculation of the tensor eigenvalues, the tensor component along velocity, and/or the generalized first normal stress difference, select the appropriate Enable menu item(s).
To disable any of the currently enabled components, select the corresponding Disable menu item(s). See Stress Eigenvalues and Components for details about the evaluation of the eigenvalues, the extra-stress component along the direction of the velocity, and the generalized first normal stress difference.
No additional parameters or boundary conditions are required, since the viscosity law is the same as that for the flow problem (which must be of the generalized Newtonian type).