Die balancing is a major challenge for the die designer. To help address this challenge, Ansys Polyflow can compute a measure of the die balancing based on the deviation of the normal velocity with respect to the average velocity along the die exit:
 | (30–22) |
where 
is the velocity, 
is the flow rate across the boundary set, 
is the surface of the boundary set, and 
is the outward normal along the boundary set.
A perfectly balanced die with a uniform velocity at the exit leads to a measure of the
die balancing equal to zero. This measure is not absolute; you have to compare the die
balancing measure for different die geometries to determine which is the best one (that
is, the one with the smallest value for the die balancing measure). Results are
displayed as numerical values in the Ansys Polyflow listing file (search for the words
Flow balance to find them).
The procedure for specifying the calculation of the die balancing measure 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 Flow Rate and Balance.
Flow Rate and Balance
Ansys Polydata will tell you where the calculation will be performed. You can click to continue.
Specify the boundary sets for which you want to compute the die balancing measure. By default, Ansys Polyflow will compute only the flow rate (described in Flow Rate) on all boundary sets.
Select a boundary set where you want to perform the quantification of die balancing and click Modify.
Select Flow rate and balance calculated.
Repeat for any other boundary sets (if required) and click Upper level menu.