Tutorial 6: Periodic Boundaries

This tutorial demonstrates how to set up a grid on a periodic structure.

The geometry which will be gridded is shown, the grid will be periodic in the y axis, so no surfaces are created for the top and bottom of the grid.

Create and assign topology as shown. Assign these corners to the blade

Assign these corners to the left boundary.

Assign these corners to the right boundary.

Create a wrap topology around the blade.

Insert corners on the outer topology, and create links to the inner topology as shown.

To set up the periodic boundary, first select GridPro2D > Periodic Boundaries > Set up periodic boundaries from the menu. Answer yes to enable periodic boundaries.

Set the angle for periodicity. This is the angle counter-clockwise from the +X-axis. To create a grid periodic in the Y-axis enter "90" (or "270").

Set the period of the grid. An easy (if unscientific) way to determine a period for your grid is to use the rulers in Tecplot.

Next, assign corners to the periodic boundary by selecting GridPro2D > Periodic Boundaries > Assign corner pairs to periodic boundary. Corners must be assigned in pairs, selecting one corner, then its corresponding corner on the opposite boundary. The order is not important, as long as corners are assigned in pairs. You can click on the corners in the order shown to assign them.

Once the corners are assigned, topology is complete. Densities can be adjusted as shown to improve grid quality.

The completed grid after grid generation is complete.

The completed grid exported to Fluent format