Liquid compressibility as a function of hydrostatic pressure

sgopal1 · April 30, 2019, 13:07

I am trying to model depressurization of an oil well. The well is ~5000m deep and is filled with water at high pressure. There is a huge hydrostatic pressure at the bottom of the well because of the vertical depth. Is there a way to account for compressiblity of water with hydrostatic pressure. Seems like the compressible liquid option only takes into account the static pressure and not the hydrostatic head.

Really appreciate the help. Thanks in advance.

LuckyTran · April 30, 2019, 13:59

Quote:

Originally Posted by sgopal1

Seems like the compressible liquid option only takes into account the static pressure and not the hydrostatic head.

Are you sure? If so, that's a bug and you should tell Fluent so they can fix it.

sgopal1 · April 30, 2019, 15:26

Please see the setup and the results. I do not think it is working.

LuckyTran · May 1, 2019, 11:32

There is high density on the right and low density on the left. What else do you want?

sgopal1 · May 1, 2019, 11:36

Quote:

Originally Posted by LuckyTran

There is high density on the right and low density on the left. What else do you want?

In a deep well the hydrostatic head can be as high as 5,000 psi, so there is huge change in absolute pressure.

I am able to get the correct hydrostatic head by setting the reference density to 0.

LuckyTran · May 1, 2019, 12:37

If you want to see the hydrostatic pressure in the static pressure plot, then you need to set the operating pressure to 0. Yes that is correct.

I don't get what result you expect to see that is not shown here.

Also, boundary conditions = ???

sgopal1 · May 1, 2019, 12:39

Thank you and appreciate the input.

LuckyTran · May 1, 2019, 12:43

Also why did you set (or leave as default) the maximum density ratio to 1.1?

sgopal1 · May 1, 2019, 12:47

Yes, that was the default max density ratio and the density I expect falls within this range.

April 30, 2019, 13:07	Liquid compressibility as a function of hydrostatic pressure	#1
sgopal1 New Member sri krishna Join Date: Jul 2018 Posts: 6 Rep Power: 7	I am trying to model depressurization of an oil well. The well is ~5000m deep and is filled with water at high pressure. There is a huge hydrostatic pressure at the bottom of the well because of the vertical depth. Is there a way to account for compressiblity of water with hydrostatic pressure. Seems like the compressible liquid option only takes into account the static pressure and not the hydrostatic head. Really appreciate the help. Thanks in advance.

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May 1, 2019, 11:32		#4
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,674 Rep Power: 65	There is high density on the right and low density on the left. What else do you want?

May 1, 2019, 12:37		#6
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,674 Rep Power: 65	If you want to see the hydrostatic pressure in the static pressure plot, then you need to set the operating pressure to 0. Yes that is correct. I don't get what result you expect to see that is not shown here. Also, boundary conditions = ???

May 1, 2019, 12:39		#7
sgopal1 New Member sri krishna Join Date: Jul 2018 Posts: 6 Rep Power: 7	Thank you and appreciate the input.

May 1, 2019, 12:43		#8
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,674 Rep Power: 65	Also why did you set (or leave as default) the maximum density ratio to 1.1?

May 1, 2019, 12:47		#9
sgopal1 New Member sri krishna Join Date: Jul 2018 Posts: 6 Rep Power: 7	Yes, that was the default max density ratio and the density I expect falls within this range.