In addition to the specification of boundary conditions within Ansys Polydata, as described in the previous sections, you can also specify a velocity profile outside of Ansys Polydata (for example, using a spreadsheet such as Excel), and then read it in to define the conditions on a boundary section.

The format for the profile data must be a CSV (comma separated variables) file, which is a common format for tabulated data that can be read into spreadsheet programs such as Excel. The profile file should contain a list of data points (, , ) and a list of velocity vectors (, , ). For more information about setting up a file with the correct format, you can follow the instructions in Using the CSV File to Initialize Solution Variables for creating a template CSV file.

When Ansys Polyflow reads a CSV file, it will interpolate the data (if they do not correspond exactly to the nodes in the mesh) between the listed values; the node in the mesh that is located closest to a data point will be initialized to the specified value.

To define velocity conditions on a boundary section, follow these steps:

Note that boundary conditions imposed via a CSV file are evaluated only once. In other words, if the CSV file contains a velocity distribution in space, the evaluation will be based on the geometry that is known at the beginning of the calculation, even if the boundary is moving.