vof model_finegrid_urgent plz help

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 May 14, 2008, 06:58 vof model_finegrid_urgent plz help #1 garima chaudhary Guest   Posts: n/a Dear all, I am facing a great issue regarding simulating a rotating cylinder using vof method. I did for 6 different grid sizes for a domain of size 8cm*2cm. THe different no of cells taken are 1600,2560,6400,10000,25600,40000 for this domain size . I observe that the last two finest grids give me very different velocity profiles as compared to other grids, also i think its not realistic , i am not able to make out wats the issue bcoz as we go on refining the grid size the solution shud converge which is not happening. i AM TAKING an axisymmetric swirl case . my geometry consistes of a axisymmetric cylinder 8cm*2cm. the height of the cylinder is 8 cm and the radius is 2 cm.the cylinder is filled with water till a ht of 3 cm , the rest is air. at the top of the cylinder i hav taken pressure outlet boundary condition and the wall is rotaing at speed of 50 rad/sec. i will be highly obliged if u kindly help me in resolving this issue , i need it urgently. regards garima

 May 14, 2008, 18:11 Re: vof model_finegrid_urgent plz help #2 m@rk@s Guest   Posts: n/a Dear Garima, there is one tutorial of VOF in fluent. i think this would solve your problem. Just GO through it. Even after this you are not getting answer of your problem, just drop your message.

 May 15, 2008, 00:30 Re: vof model_finegrid_urgent plz help #3 garima chaudhary Guest   Posts: n/a thank u sir for your guidance. I would like to tell u that i have already gone thru that tutorial but its not resolving my isssue. hope u may look into the problem n suggest me something.

 May 15, 2008, 10:20 Re: vof model_finegrid_urgent plz help #4 m@rk@s Guest   Posts: n/a Could you brief me about your problem? Also tell me about what output you want from this simulation. Please tell me in detail.

 May 16, 2008, 15:11 Re: vof model_finegrid_urgent plz help #5 m@rk@s Guest   Posts: n/a Dear Garima, Could you send case file in which you are facing problem of convergence. Please send it on my Personal Email address and also discribe your problem in detail. My personal email address is "chetanprashant@gmail.com".

 May 17, 2008, 08:27 Re: vof model_finegrid_urgent plz help #6 garima chaudhary Guest   Posts: n/a thanku sir i got the reason for my problem. i was working on fluent 6.2 version which is not giving me appropriate results so i moved to now 6.3 version which is giving me perfect results thanku sir for ur guidance

 May 20, 2008, 15:05 Re: vof model_finegrid_urgent plz help #7 m@rk@s Guest   Posts: n/a Garima, you have not consider any turbulance model in your simulation and you discussed that flow is swirl in your simulation. i feel turbulance should be included. Comment.

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