[Ananthakrishnan]

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 http://www.cfd-online.com/Forums/ope...let-fluid.html ]

[Ananthakrishnan]

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

[ssss]

Well setting alpha.oil to 1 will certainly blow the simulation. Try changing the U.oil and U.cement

[Ananthakrishnan]

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

[wyldckat]

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:

site:www.cfd-online.com/Forums uniformFixedValue

you'll find several examples.

Best regards,
Bruno

[Ananthakrishnan]

Hi bruno..

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

thanks
Ananth

[Ananthakrishnan]

Hi bruno,

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

Regard,
Ananth