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Water Column, Static Pressure Study

11 REPLIES 11
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Message 1 of 12
pompeo79
430 Views, 11 Replies

Water Column, Static Pressure Study

Hi to all,

 

here a video i made  to describe it for you (static pressure in a 10 m water column)

 

http://www.youtube.com/watch?v=oTjWx3MnHsc

 

Where i wrong?

 

Thanks for suppport,

 

Pompeo

 

Pipe.jpg

11 REPLIES 11
Message 2 of 12
OmkarJ
in reply to: pompeo79

Video is not available!

OJ

Message 3 of 12
pompeo79
in reply to: pompeo79

The video works fine now. I think it was a youtube issue.

 

Tell me if it's ok for you guys too.

Message 4 of 12
pompeo79
in reply to: pompeo79

If the previous video won't work, try with this one, more stable:

 

http://www.youtube.com/watch?v=i8j3b3fOu-8

 

 

 

Message 5 of 12
pompeo79
in reply to: pompeo79

The pressure at the bottom of a 10 m water column would be 100 Kpa

 

With the simulation i obtain 164 Pa for the bottom of the column.

 

Any ideas?

 

For considering gravity force i have set : SOLVE > Physics>Heat Transfer>Gravity Direction 0,0,1

 

 

Message 6 of 12
mrnfs
in reply to: pompeo79

Try ... Gravity Direction 0,0,-1

Message 7 of 12
pompeo79
in reply to: pompeo79

same distribuition..but reversed...same maximum of 164 Pa.

Message 8 of 12
pompeo79
in reply to: pompeo79

No one?

 

In other word...is it possibile with cfd simulation do a hydrostatic study of pressures in a simple water column?!

 

 

 

Message 9 of 12
Royce_adsk
in reply to: pompeo79

The quick answer to that is that we aren't traditinally setup to do hydrostatics.  When we introduced the free surface modeling in 2014, that does include hydrostatics so you could try using that. 

 

Also, try turning on the total pressure result, I think that does give you the hydrostatic pressure result.

 

-Royce



Royce.Abel
Technical Support Manager

Message 10 of 12
OmkarJ
in reply to: pompeo79

I have a bad experience with hydrostatic flows, at least for SimCFD 2013. But for some reason, I believe that this dodgyness in results is our inability to set the right boundary condition for top surface of the water column. 

 

I hope that 2014, with the free surface BC, the top surface has now an adequate representation, and will come down in a more natural and realistic manner, as the water in the column is released from the bottom. This doesn't happen now with 2013 and perhaps solver struggles to find peace with the mass conservation.

 

OJ

Message 11 of 12
pompeo79
in reply to: pompeo79

Hy Royce, thank you.

I am testing the free surface (nice!).

 

I don't understand when you say "try turning on the total pressure result, I think that does give you the hydrostatic pressure result.",   where can i turn "the total pressure result"?  I see only static pressure.

Message 12 of 12
Royce_adsk
in reply to: pompeo79

Review the section in the help for 'Result Quantities'

http://wikihelp.autodesk.com/Simulation_CFD/enu/2014/Help/0532-User_s_G532/0698-Process698/0836-Solv...

 

-Royce



Royce.Abel
Technical Support Manager

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