[Pallav]

Hello,

I am trying to follow the free surface tutorial by Hassan Hemida which can be found at http://www.tfd.chalmers.se/~hani/kurser/OS_CFD_2007/HassanHemida/Hassan_Hemida_VOF.pdf

I am not able to get the right outputs which should be like the attachment that I have uploaded.

I have tried creating contours for the same but I do not get similar outputs as shown in the tutorial.

In the tutorial it is mentioned that these outputs are taken at a particular time step. How can this be done using paraFoam?

Please advise.

Thank you.

Regards,
Pallav

[flowris]

All tutorials on multiphase can be found in OpenFOAM/OpenFOAM-1.7.x/tutorials/multiphase.

[gwierink]

Hi Pallav,

The pic you uploaded is taken at 0.4 s, at least that is what the tutorial says. The field you see is gamma, the phase fraction field. In the latest version of OpenFOAM this field is called alpha. In paraFoam, select field "alpha1" and go to timestep 0.4 s with the forward button.

Originally Posted by flowris

All tutorials on multiphase can be found in OpenFOAM/OpenFOAM-1.7.x/tutorials/multiphase.

No, not this one.

[Pallav]

Thanks Gijsbert and Joris for your replies.

I am running OF-1.7-x and made modifications to the dambreak tutorial as per the instructions mentioned in the pdf.

I did not get any output for gamma as shown in the pdf. When I choose 'Set color by' to gamma, I get output as the attachment, 'choose gamma in display tab'. This looks as it should. However, when I hit the play button I get the output as the second attachment, 'hit play button', for all time steps.

So, I tried to download and run the actual case file posted at http://www.tfd.chalmers.se/~hani/kurser/OS_CFD_2008/
However, I ran into a lot of errors (eg: could not find cAlpha in PISO)


Joris,
I still refer to pdf files as tutorials. Sorry, my bad.
I wanted to know if there are some more pdf files with instructions which will help me learn how to set up cases for studying phase fractions using VOF.

[gwierink]

Hi Pallav,

Originally Posted by Pallav

could not find cAlpha in PISO

Have you looked in system/fvSolution, line 59 (if the file is still original)?
If you're looking for something and really cannot find it, it may be handy to use e.g.:

[gijsbert@orava fillingBottle]$ grep -irn calpha .
./system/fvSolution:59:    cAlpha          1;

where option "i" means ignore case, "r" means recursive, and "n" means display line number.

When following the tutorial "1.7.x style", I do get output, although slightly different. But I must say that I did not go through every detailed setting. Just running the case with laminar interFoam I get the pic attached. Let me know if you need the case file.

[Pallav]

Thank you Gijs.

I managed to run the case and obtain similar outputs. I had to make some more changes to the damBreak tutorial which were not mentioned in the pdf.

However, I would like to compare your case file with mine for better understanding. So, please send it to me.

Regards,
Pallav

[gwierink]

Hi Pallav,

No problem, here is the case I used.

[Pallav]

Thanks a lot, Gijs.