some markups on the drawing would be helpful but hopefully this will answer your question. your options for perforated panels are:
1. model the holes
2. user a perforated panel
3. porous medium
option 1 has a long solve times and you need to make sure you capture the behavior
option 2 only works for internal analyses and putting the perf panels on inlets or outlets
option 3 is the best well rounded option. if you don't have the perf panel properties, you'll need to come up with them yourself. http://www.hawkridgesys.com/blog/flow-simulation-2013-parametric-studies/
Thank you Jared.
The 1st option already excluded. Even designing it solidworks will be very slow, meshing it, "impossible" to run.
The 2nd option, a good idea if only one perforated plate.
The 3rd option, I do agree, the best. But I do not have perforated panel properties needed to fill in Flow Simulation. To do that, can I just set, for example a small portion of the perforated plate? for example 20 cm x 20 cm of my perforated plate instead of a 900 cm x 900 cm (the real one)? To obtain the pressure drop vs flow rate. To simplify the mesh, with 900cm x 900 cm will be quite impossible.
you've got it