6 Replies Latest reply on Sep 30, 2014 8:14 PM by Jared Conway

    Pressure drop over a perforated plate

    Dom Enico
    Dom Enico Sep 23, 2014 7:02 AM

      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:

      1.JPG

       

      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.

      2-1.JPG

      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