If you are using one of the density-based solvers, in order to calculate a spatially periodic flow field with a specified pressure jump, you must first create a grid with translationally periodic boundaries that are parallel to each other and equal in size. (If you need to create periodic boundaries, see Section 6.8.4.)
Then, follow the steps below:
Define Boundary Conditions...
After completing these inputs, you can solve the periodic velocity field to convergence.