Hi,
I am a student who is fairly new to CFD so forgive my ignorance on the subject at hand.
I have designed a duct with many slots that will be used to provide cooling in a cabinet. Essentially, I feel this is a perforated plate and I would like to know the pressure drop over it to be able to select a fan.
I've set up a 'virtual wind tunnel' in Solidworks as discussed in this thread https://forum.solidworks.com/thread/21433?q=Pressure%20drop%20throu . I've made the wind tunnel 1m long with a volumetric flow rate of 0.2m3/s at one end and environmental pressure at the other. I then set up surface pressure goals at each end and then found the difference between them to determine pressure drop. Here is a diagram:
Here is the 'perforated plate': It is 1320 x 1360 mm and the slots are 200x10mm and the thickness is 1mm. Free area is 8.5
I've set up a local initial mesh for the plate with a mesh size of 1mm.
My problem is that I am only getting a pressure drop of about 2 Pa. I initially set up the study with one quarter of the plate (and one quarter flow rate) and got similar results as expected.
I feel this is quite small and wondering if there is an issue in my model.
Are there any suggestions?
Thanks
how do you know it is too small? do you have something with known results that you can check?
second, do you know your part is getting meshed properly? if not, it could just be that things are being skipped.
what is the pressure drop without any plate at all? that is a good gauge