[Jalil786]

Hello all,


I am using compressibleInterFoam solver in OpenFoam to simulate the effects of entrapped air in a water pipeline. But I have problem with generating the Mesh for the simulation.



The apparatus is composed of a large tank at the upstream, a 10 m long horizontal pipe with 0.1 m diameter, and a vertical ventilation tower (Diameter=5 cm) that releases the air, the ventilation hole at the top of the tower has an area of 5% of the ventilation tower area (Diameter = 1.135 cm).



In order to make a mesh that has all the apparatus, I need to make very fine cells around the ventilation tower and courser mesh (larger cells) everywhere else. Whenever, I run the snappyHexMesh, I get the mesh generated, but the number of bad cells are huge.



Therefore, the simulation always crashes. I have attached a screenshot of the final step of running snappyHexMesh.



When I set the case and run it, it always crushes. I guess the main reason is the bad cells. I also think that I cannot set the boundary condition properly. Therefore, I have attached a zip folder of the case. Here is the link to the case folder.



https://www.dropbox.com/s/9fxvjcsgnezq7h7/Off_campus_Nov.zip?dl=0



I shall be very grateful if someone can help me overcome this issue or introduce any other way of the creating mesh that can work.


Thank you all in advance!

[hwangpo]

Hi Jalil,

If you are looking for CFD modeling of storm geysers, a book chapter may be helpful.
https://doi.org/10.1061/9780784415313.ch23. (Chapter 23: Geysering in Computational Fluid Dynamics: Applications in Water, Wastewater, and Stormwater Treatment)
Both ANSYS CFX and OpenFOAM were used. The tutorial files can be found in https://doi.org/10.4211/hs.344350caa...a9eb33cbed3f78.

Cheers.
Biao