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Injecting a different fluid after certain time

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Old   July 27, 2015, 01:45
Default Injecting a different fluid after certain time
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Ananthakrishnan.A.S
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Hi..

Sorry to revive an old thread.

my doubt is somewhat similar.. My requirement is pipe is initially filled with fluid X. Q quantity of Fluid Y enters the pipe. After that Q quantity of Fluid Z has to enter through the same inlet (like flushing the pipe with fluids one after the other)

I have succeeded in flushing the pipe with Fluid Y. I dont know how to continue the simulation by changing the incoming fluid (Z).
I have defined the alpha.X alpha.Y alpha.Z.

Any hint will be greatly appreciated!!

thank you very much
Regards
Ananth

[ Moderator note: Moved from Inlet of fluid ]

Last edited by wyldckat; August 2, 2015 at 09:16. Reason: see "Moderator note"
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Old   July 29, 2015, 06:43
Default Injecting a different fluid after certain time
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Hi,

I am performing a multiphase simulation where pipe is initially filled with mud water. Cement enters through the inlet. After Q vol of cement has been pumped, oil has to be pumped through the same inlet.


I have simulated the first step of pumping cement through mud filled pipe(using multiPhaseInterFoam) by setting inlet value of alpha.cement as one and rest 0. but cant understand how to inject oil now. I tried changing the alpha.oil to 1 and alpha.cement as 0 in the latest time step but it doesnt work.


I have attached all the case files for reference.
It would be very grateful If someone can point out the mistake in my case set up and/or give directions about how to proceed with this simulation.

Thank you very much
Regards
Ananth
Attached Files
File Type: zip case.zip (35.8 KB, 1 views)
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Old   July 29, 2015, 11:50
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Well setting alpha.oil to 1 will certainly blow the simulation. Try changing the U.oil and U.cement
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Old   July 30, 2015, 00:09
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hi..

I tried that..what i found was U.* is not required for multiphaseInterFoam(may be i am wrong..!!)!!! MultiphaseEulerfoam needs those.

thanks a lot for the idea..
Ananth

Last edited by Ananthakrishnan; July 30, 2015 at 01:44.
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Old   August 2, 2015, 11:35
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Greetings to all!

@Ananth: There is a boundary condition named "uniformFixedValue" as of OpenFOAM 2.1.0: http://www.openfoam.org/version2.1.0...conditions.php - if you time things correctly, probably with an "inline table", you can get the U field to start/stop when you want and the same of the other alpha fields.

If you Google:
Code:
site:www.cfd-online.com/Forums uniformFixedValue
you'll find several examples.

Best regards,
Bruno
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Old   August 2, 2015, 11:53
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Hi bruno..

oh okie.. sounds perfect..thanks a lot for the info. will check it out..

thanks
Ananth
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Old   August 6, 2015, 02:27
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Hi bruno,

works perfectly with alpha.* as well.. !! thanks a lot

Regard,
Ananth
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