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How to capture static pressure along any section of a pipe?

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Old   June 2, 2017, 09:44
Default How to capture static pressure along any section of a pipe?
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I am modelling a 3D 90 degree bend so that I can estimate the friction loss coefficient for the pipe fitting (excluding the major friction caused by straight pipe). In order to do so, I need the static pressure values at the ends of the straight pipe section. Can guide me on how to get the values please? Thanks
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Old   June 3, 2017, 12:10
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Can you post a graphic describing your problem? What you call "the ends of the straight pipe section" might mean the inlet and outlet of the geometry, or it could mean the point where the pipe switches from straight to starting to bend.

The good news is that it might be simple to help you, regardless of where the ends of the straight pipe are located.
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Old   June 4, 2017, 00:55
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Quote:
Originally Posted by RaiderDoctor View Post
Can you post a graphic describing your problem? What you call "the ends of the straight pipe section" might mean the inlet and outlet of the geometry, or it could mean the point where the pipe switches from straight to starting to bend.

The good news is that it might be simple to help you, regardless of where the ends of the straight pipe are located.
Sorry for the bad description.
Here is a picture of what I was trying to convey.
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Old   June 4, 2017, 22:02
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You need to clarify what you mean by static pressure at the two points, do you actually mean points or a general region at the axial location?

For points, create a surface monitor (a point monitor). Then there are many ways grab the value of the static pressure there. You can simple select the surface in a plot, select the point, and infer what the pressure is from te ranges. You could also setup monitors or reports.

Usually, since you are doing 3D simulations anyway, you like to use more than just point data and get the average static pressure at plane slicing through that axial location.

Note however, that it might be better to calculate the total pressure drop rather than the static pressure drop depending on you problem setup.

Last edited by LuckyTran; June 5, 2017 at 18:09.
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Old   June 5, 2017, 01:36
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I would monitor the average pressure in those planes.
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Old   June 5, 2017, 04:51
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I would monitor the average pressure in those planes.
Can i know how? Sorry guys, im very new to CFD
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Old   June 5, 2017, 05:08
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Create planes:
https://www.sharcnet.ca/Software/Flu...g/node1120.htm

Monitor average pressure on those planes:
http://www.afs.enea.it/project/neptu...ug/node815.htm

As LuckyTran said, total pressure might be better than static pressure.
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Old   June 5, 2017, 11:45
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Quote:
Originally Posted by KaLium View Post
Create planes:
https://www.sharcnet.ca/Software/Flu...g/node1120.htm

Monitor average pressure on those planes:
http://www.afs.enea.it/project/neptu...ug/node815.htm

As LuckyTran said, total pressure might be better than static pressure.
thanks! this is exactly what i need
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Old   June 7, 2017, 03:59
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Quote:
Originally Posted by KaLium View Post
Create planes:
https://www.sharcnet.ca/Software/Flu...g/node1120.htm

Monitor average pressure on those planes:
http://www.afs.enea.it/project/neptu...ug/node815.htm

As LuckyTran said, total pressure might be better than static pressure.
Sorry for double posting.

As for the 'Report Type', which one do I choose? Mass Weighted Average or Area Weighted Average?

After I run the calculation, I just have to go to Reports>Surface Integrals to compute the average pressure, right?
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Old   June 7, 2017, 04:10
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Quote:
Originally Posted by lukelee94 View Post
As for the 'Report Type', which one do I choose? Mass Weighted Average or Area Weighted Average?
I personally use mass weighted average for all fluid properties.

Quote:
Originally Posted by lukelee94 View Post
After I run the calculation, I just have to go to Reports>Surface Integrals to compute the average pressure, right?
With that method, you will get single value for pressure. If you use fluent-monitors, you will know pressure on different iterations. -> information about fluctuation and convergence.

https://www.sharcnet.ca/Software/Flu...g/node1050.htm
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