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-   -   What causes the difference ?!!! (https://www.cfd-online.com/Forums/fluent-multiphase/230508-what-causes-difference.html)

o_mars_2010 September 26, 2020 10:29

What causes the difference ?!!!
 
2 Attachment(s)
I have a simulation of the toilet flushing process.
The simulation have been done on both ANSYS Fluent & COMSOL Multiphysics.


I captured a snapshot of the simulation at the same time from both programs.
On ANSYS the water is flowing down in layers, while in COMSOL the fluid exit like a Jet.


Could you please help me to find what is causing such a difference.
Fluent simulation is based on VOF, while COMSOL is based on Level of Set.


Both simulation are turbulent with realizable k-e model.

cae October 9, 2020 18:14

the contact angle on the wall? In Comsol, you set 90degrees. But in fluent, like 150?

Eshfor September 17, 2021 10:21

I consulted with my uncle James, he is a plumber, and he said that the difference is because different types of toilet bowls need different sanitary blocks. That is, for the first case, the place of flushing works differently, and in the second case, the design is less complex and therefore the drain is completely different. It also depends on the angle at which the toilet is installed. This is an important parameter, because it depends on how the toilet flush will work and whether water will be collected there. Once we were doing repairs and incorrectly installed the toilet. As a result, after a couple of days there was a flood and all the shit came out. It was a terrible sight! If you want to click site and read the information about it, I think you will understand everything yourself.


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