rotating fan

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 November 24, 2020, 10:38 rotating fan #1 New Member   Anthony Join Date: Nov 2020 Location: Korea Posts: 5 Rep Power: 3 Hi, I am a total beginner of using star ccm+ and I would like to get some help. I followed the tutorial that is posted online/youtube that shows how to run the simulation, and I want to know the pressure difference between the inlet and outlet. So far, I got the area averaged inlet pressure, but my area averaged outlet pressure is constant 0. Thanks in advance. Attaching the youtube site for reference. https://www.youtube.com/watch?v=KvQc..._channel=Howto

 November 24, 2020, 12:38 #2 Senior Member   Matt Join Date: Aug 2014 Posts: 877 Rep Power: 15 First of all, I don't think that tutorial has a report for average outlet pressure. However, it makes sense for a report placed on a boundary condition to return the target value/setting. The outlet is a pressure outlet, with 0 gauge pressure (unless you changed it). You are telling the solver that the pressure at this plane is always 0 so that it can bound the problem and find a solution. At the velocity inlet, you are specifying velocity rather than pressure and would get a similar result for area averaged inlet velocity.

 November 24, 2020, 13:23 #3 Senior Member   Chaotic Water Join Date: Jul 2012 Location: Elgrin Fau Posts: 264 Rep Power: 14 Reports -> Pressure Drop.

November 26, 2020, 08:20
#4
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Anthony
Join Date: Nov 2020
Location: Korea
Posts: 5
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Quote:
 Originally Posted by fluid23 First of all, I don't think that tutorial has a report for average outlet pressure. However, it makes sense for a report placed on a boundary condition to return the target value/setting. The outlet is a pressure outlet, with 0 gauge pressure (unless you changed it). You are telling the solver that the pressure at this plane is always 0 so that it can bound the problem and find a solution. At the velocity inlet, you are specifying velocity rather than pressure and would get a similar result for area averaged inlet velocity.
Thanks for the reply. So in order to find the outlet pressure, do i have to change the gauge pressure which is 0? From the region - fluid-boundaries-pressure-physical values-pressure is at a constant 0 Pa, do i have to change the physics condition?

November 26, 2020, 08:22
#5
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Chaotic Water
Join Date: Jul 2012
Location: Elgrin Fau
Posts: 264
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Quote:
 Originally Posted by won0726 So in order to find the outlet pressure, do i have to change the gauge pressure which is 0? From the region - fluid-boundaries-pressure-physical values-pressure is at a constant 0 Pa, do i have to change the physics condition?
I'm afraid - you have to read a bit about what pressure first.

November 26, 2020, 08:24
#6
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Anthony
Join Date: Nov 2020
Location: Korea
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Quote:
 Originally Posted by cwl Reports -> Pressure Drop.
Thanks for the reply. I tried using the pressure drop. So the high pressure would the 2 interfaces from the fluid:inlet and the low pressure would the fluidressure which is the boundary?

 November 26, 2020, 08:29 #7 New Member   Anthony Join Date: Nov 2020 Location: Korea Posts: 5 Rep Power: 3 Sorry but can you be a bit more specific?

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