Ansys Employee
You need to assume the units in APDL. If you are using command snippets make sure that you use the same units in the snippet that you selected in workbench. For example if you are using Metric (um, kg, uN, s, V, mA) specify the porous media properties in the same units. You could use this - https://simutechgroup.com/detecting-units-with-an-apdl-commands-object-in-ansys-mechanical-workbench/-to avoid mismatch.
Regards Ishan.