CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > FLUENT

Liquid compressibility as a function of hydrostatic pressure

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   April 30, 2019, 13:07
Default Liquid compressibility as a function of hydrostatic pressure
  #1
New Member
 
sri krishna
Join Date: Jul 2018
Posts: 6
Rep Power: 7
sgopal1 is on a distinguished road
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.
sgopal1 is offline   Reply With Quote

Old   April 30, 2019, 13:59
Default
  #2
Senior Member
 
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,684
Rep Power: 66
LuckyTran has a spectacular aura aboutLuckyTran has a spectacular aura aboutLuckyTran has a spectacular aura about
Quote:
Originally Posted by sgopal1 View Post
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.
LuckyTran is offline   Reply With Quote

Old   April 30, 2019, 15:26
Default
  #3
New Member
 
sri krishna
Join Date: Jul 2018
Posts: 6
Rep Power: 7
sgopal1 is on a distinguished road
Please see the setup and the results. I do not think it is working.
Attached Images
File Type: png Density.PNG (40.3 KB, 10 views)
File Type: png Gravity.PNG (17.8 KB, 8 views)
File Type: png density_dist.PNG (15.7 KB, 9 views)
File Type: png pressure.PNG (16.6 KB, 8 views)
File Type: png sound.PNG (15.8 KB, 7 views)
sgopal1 is offline   Reply With Quote

Old   May 1, 2019, 11:32
Default
  #4
Senior Member
 
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,684
Rep Power: 66
LuckyTran has a spectacular aura aboutLuckyTran has a spectacular aura aboutLuckyTran has a spectacular aura about
There is high density on the right and low density on the left. What else do you want?
LuckyTran is offline   Reply With Quote

Old   May 1, 2019, 11:36
Default
  #5
New Member
 
sri krishna
Join Date: Jul 2018
Posts: 6
Rep Power: 7
sgopal1 is on a distinguished road
Quote:
Originally Posted by LuckyTran View Post
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.
sgopal1 is offline   Reply With Quote

Old   May 1, 2019, 12:37
Default
  #6
Senior Member
 
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,684
Rep Power: 66
LuckyTran has a spectacular aura aboutLuckyTran has a spectacular aura aboutLuckyTran has a spectacular aura about
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 = ???
LuckyTran is offline   Reply With Quote

Old   May 1, 2019, 12:39
Default
  #7
New Member
 
sri krishna
Join Date: Jul 2018
Posts: 6
Rep Power: 7
sgopal1 is on a distinguished road
Thank you and appreciate the input.
sgopal1 is offline   Reply With Quote

Old   May 1, 2019, 12:43
Default
  #8
Senior Member
 
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,684
Rep Power: 66
LuckyTran has a spectacular aura aboutLuckyTran has a spectacular aura aboutLuckyTran has a spectacular aura about
Also why did you set (or leave as default) the maximum density ratio to 1.1?
LuckyTran is offline   Reply With Quote

Old   May 1, 2019, 12:47
Default
  #9
New Member
 
sri krishna
Join Date: Jul 2018
Posts: 6
Rep Power: 7
sgopal1 is on a distinguished road
Yes, that was the default max density ratio and the density I expect falls within this range.
sgopal1 is offline   Reply With Quote

Reply

Tags
compressible liquid, hydrostatic pressure

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Wind tunnel Boundary Conditions in Fluent metmet FLUENT 6 October 30, 2019 12:23
[mesh manipulation] refineMesh Error mohsen.boojari OpenFOAM Meshing & Mesh Conversion 3 March 1, 2018 22:07
Calculation of the Governing Equations Mihail CFX 7 September 7, 2014 06:27
[blockMesh] BlockMesh FOAM warning gaottino OpenFOAM Meshing & Mesh Conversion 7 July 19, 2010 14:11
Hydrostatic pressure in 2-phase flow modeling (long) DS & HB Main CFD Forum 0 January 8, 2000 15:00


All times are GMT -4. The time now is 11:24.