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CFX fan modelling: Issue in pressure drop measurement |
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December 27, 2023, 02:42
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CFX fan modelling: Issue in pressure drop measurement
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#1 |
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New Member
Join Date: Nov 2013
Posts: 3
Rep Power: 12  |
Hello experts,
I have a technical query related to the pressure drop measurement in an enclosure. When we use a smaller axial fan (e.g., an exhaust fan) in an enclosure, will it cause an additional pressure drop? See below image from a CFX simulation. Towards the fan entry, there is a sudden drop in pressure. Is this due to a sudden contraction of the flow path? Is this behavior expected if we use a cooling fan on any device? Initially, I have simulated using MRF/Frozen rotor approach; A similar behavior is observed. The attached image is a simplified case, where conditions are: Inlet: Static Pressure 0Pa Outlet (After the fan): Mass flow rate is specified |
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December 27, 2023, 05:38
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#2 |
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Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,854
Rep Power: 144 |
The pressure drop as you approach the fan inlet is just Bernoulli's equation - as the fluid speeds up its pressure will reduce.
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Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum. |
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| Tags |
| cfx, fan as momentum source, fan boundry conditions, momentum sources, mrf |
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