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simpleFoam: Verification of a laminar 3D Pipe flow with water

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Old   March 23, 2017, 06:54
Question simpleFoam: Verification of a laminar 3D Pipe flow with water
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Hi,

i am new to OpenFOAM, but i have done my first simulations with simpleFoam.
To verificate my studies i want to do a classic example.
I have a Pipe with 1m length, 0,01m diameter. Through that pipe i have a flow with water at 20 C with 0,1 m/s. I made a 3D model of the pipe with Solidworks, exported it to STEP and meshed it with SALOME, being carefully about the units, because it has to be converted in meters. Now when i run the study at the end i do a "postProcess -func 'patchAverage(name=inlet, p)'" i get a pressure that i have to multiply with rho. The result of that is 56 Pa. The analytical result of my calculation with the Law of Hagen-Poiseulle is 32.064 Pa. Now my first question is, why is there so much difference between the analytical result and the simulation?

My second question is: I did a "postProcess -func "totalPressureIncompressible(p,U)"", but the result is 0.006 Pa. Why is that?

The whole case is around 44 MB including the STEP file and the UNV Mesh, so where to upload? I don't have an own webspace.

Regards, fanta
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Old   March 24, 2017, 01:32
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Hi,
i uploaded the case to google drive:

https://drive.google.com/file/d/0BwY...ew?usp=sharing

Regards, fanta
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