[lukelee94]

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

[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.

[lukelee94]

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.

Sorry for the bad description.
Here is a picture of what I was trying to convey.

[LuckyTran]

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.

[KaLium]

I would monitor the average pressure in those planes.

[lukelee94]

Originally Posted by KaLium

I would monitor the average pressure in those planes.

Can i know how? Sorry guys, im very new to CFD

[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.

[lukelee94]

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

[lukelee94]

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?

[KaLium]

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.

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