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

 Register Blogs Members List Search Today's Posts Mark Forums Read

 June 2, 2017, 09:44 How to capture static pressure along any section of a pipe? #1 New Member   Join Date: May 2017 Posts: 8 Rep Power: 2 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

 June 3, 2017, 12:10 #2 New Member   Jason Join Date: Dec 2016 Posts: 19 Rep Power: 3 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.

June 4, 2017, 00:55
#3
New Member

Join Date: May 2017
Posts: 8
Rep Power: 2
Quote:
 Originally Posted by RaiderDoctor 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.
Here is a picture of what I was trying to convey.
Attached Images
 w.jpg (36.0 KB, 15 views)

 June 4, 2017, 22:02 #4 Senior Member   Lucky Tran Join Date: Apr 2011 Location: Orlando, FL USA Posts: 1,982 Rep Power: 26 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.

 June 5, 2017, 01:36 #5 Senior Member     Kal-El Join Date: Apr 2017 Location: Finland Posts: 150 Rep Power: 2 I would monitor the average pressure in those planes.

June 5, 2017, 04:51
#6
New Member

Join Date: May 2017
Posts: 8
Rep Power: 2
Quote:
 Originally Posted by KaLium I would monitor the average pressure in those planes.
Can i know how? Sorry guys, im very new to CFD

 June 5, 2017, 05:08 #7 Senior Member     Kal-El Join Date: Apr 2017 Location: Finland Posts: 150 Rep Power: 2 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.

June 5, 2017, 11:45
#8
New Member

Join Date: May 2017
Posts: 8
Rep Power: 2
Quote:
 Originally Posted by KaLium 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

June 7, 2017, 03:59
#9
New Member

Join Date: May 2017
Posts: 8
Rep Power: 2
Quote:
 Originally Posted by KaLium 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?

June 7, 2017, 04:10
#10
Senior Member

Kal-El
Join Date: Apr 2017
Location: Finland
Posts: 150
Rep Power: 2
Quote:
 Originally Posted by lukelee94 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 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

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post archymedes OpenFOAM Pre-Processing 94 July 15, 2016 16:14 Mohsin FLUENT 36 April 29, 2016 17:16 asder CFX 3 March 2, 2008 18:18 Abhi Main CFD Forum 12 July 8, 2002 09:11 DS & HB Main CFD Forum 0 January 8, 2000 16:00

All times are GMT -4. The time now is 08:20.