gas-liquid vertical separator
 

Hi everybody, it's 4 months I'm working hardly on my thesis without any significant results,
my problem is a vertical separator (that you can see in the picture), 2phase flow inters the separator via inlet holes, the gas should be separate from liquid due to gravitational and centrifugal forces, then the free gas exits the separator from top holes and liquid exits from the inner tube, which is not happen
to simulate this I tried all the options in fluent include: Mixture model both dispersed and sharp/dispersed, Eulerian and also interfacial area concentration option, different diameters for gas phase, different surface tension models
and k-e RNG with different wall functions
I used fluent meshing and the poly hex mesh is generated
Inlet condition is mass flow inlet and outlets are pressure outlet
the problem is that the magnitude of gas/liquid does not change in any method and no gas separates
I have to solve this using steady model because the transient longs for weeks.
I would appreciate your help

Hello Zahra,


If all of these methods fail, my guess would be something is wrong with the design or with the geometry set-up. If the design isn't proven, then your cfd result may be correct. If the design works in practice, you could check the basics such as gravity orientation, internal walls being actual boundaries etc.