Learning Forum

[ophshore]

All,

Good Day. I have a problem that i am trying to solve and i would really appreciate some ideas.

 

I am new to Ansys Fluent(few months old). I have the problem attached picture. This is a vertical 15m column with two separate vertical sections meshed together with a wall in between as shown

 

1) Water and Air are injected into the domain at known mass rates. Here i have used "Mass" Inflow as my boundary inlet conditions

 

2). Water and air leaks into another column which transports vertically to outlet at 4

 

3) Gas is removed from a Gas cap or gas filled domain section which according to our experiment stays almost constant . This gas section we have been measuring moves 1 or 2mtr at maximum during the experiment. For (3), i have used the "Degassing" boundary outlet

 

4) This section, we are collecting both water and air into another tank(tank not modelled here), here in my domain i have used a "Pressure" boundary outlet

 

My problem:

I have created a flow domain, describing the below, the air volume from (3) is nothing compared with our experiments.

 

According to our experiments, we are injecting about 50,000scf/d of air at (1) and are measuring about 30,000scf/d of air at (3) while the rest goes with the water to (4).

 

Please does anyone have any ideas on a better method of modelling this ?

[DrAmine]

Please insert the image if you want us to look into it.

[ophshore]

Thanks Abenhadj

I thought i inserted the image. see insert again with this reply

 

Regards

[Rob]

Why won't water pass up the right hand column too?

[ophshore]

Pressure in the RH Column is slightly higher than pressure on the LH Column(LHC), achieved by a choke valve which from what we see its easier for liquid and air to go via the LHC

[DrAmine]

And how would you enforce that in the model. I would not use degassing boundary condition for this kind of continuous pocket of air. Rather to enforce the pressure via pressure boundary.