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Sliding mesh setup for a mixing tank in Gambit

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Old   December 19, 2008, 07:20
Default Sliding mesh setup for a mixing tank in Gambit
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nycera
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Hi, i'm a student and I need to approach the problem of a mixing reactor with the sliding mesh.

I've got several problems modelling the impeller and generating the grid with Gambit, because I didn't find tutorials and manuals quite explicative on this particular matter.

I just would like to know if anyone knows some literature, links, anything, about how to model a mixing tank and create the sliding grid with Gambit.

Thanks.
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Old   December 20, 2008, 11:33
Default Re: Sliding mesh setup for a mixing tank in Gambit
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zongtwi
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The easiest way of setting up a sliding mesh case is to convert an MRF case to a sliding mesh case inside FLUENT. Preparing an MRF case is much easier.

In GAMBIT, create two domains, one for the stationary part, and one for the rotating part. you can create a bounding cylinder around the impellers, and split the tank into two volumes. Specify the contiinuums separately, and specify your other boundary conditions accordingly. Exportt to FLUENT. In FLUENT, in the boundary condition panel, choose the rotating domain, go the the motion tab, and specify a moving reference frame motion. Specify the angular velocity and rotating centre. Specify all other boundary conditions as required. Then using the text user interface, TUI, go to Grid>Modify Zones>MRF-to-sliding-mesh. Enter the ID number for the rotating zone and press enter. This will setup your case to become a sliding mesh case.

Hope that helps
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Old   December 22, 2008, 04:50
Default Re: Sliding mesh setup for a mixing tank in Gambit
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nycera
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Thanks, I'll try that way.

Anyway, I've got some problem meshing the impeller zone and getting the mesh read by fluent too. I get some errors. I wish there could be some documentation on the internet about this particular phisical setup.

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Old   December 22, 2008, 04:53
Default Re: Sliding mesh setup for a mixing tank in Gambit
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zongtwi
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you can try emailling me your GAMBIT .dbs file...I can see if I can help you out.

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Old   December 22, 2008, 05:14
Default Re: Sliding mesh setup for a mixing tank in Gambit
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nycera
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I don't know... I thank you very much, but I'm a student and I'm doing my graduation thesis, hence I'm sort of a beginner with this softwares, maybe spending some time reading better the manuals and practicing I can figure it out by myself, I wouldn't bother you. My model in gambit is kind of a mess, if I'm honest, here it it is why I've been just searching some internet documentation about examples of stirred tank modeling.

Anyway, I've got your email, if I'm in trouble I'll eventually send you my .dbs file for help.

Thanks a lot.
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Old   December 22, 2008, 21:17
Default Re: Sliding mesh setup for a mixing tank in Gambit
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zongtwi
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OK...Good Luck!
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Old   January 12, 2009, 05:56
Default Re: Sliding mesh setup for a mixing tank in Gambit
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nycera
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Thanks to your suggestion, it looks like I sort of made it.

Mrf-to-sliding-mesh is actually the easiest way to set up a sliding mesh problem.

Now I might have some problems setting up some options on the solver, because I'm using the LES turbulence modeling. Can I email you for a bit of help?

Thanks nycera
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Old   February 19, 2011, 05:09
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ziq
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hi. i'm a student too. i have a problem with MRF. but i am trying to mesh a fan blade instead of mixing tank. i tried to split outer volume with inner volume. but then after i export the mesh and read it in fluent. the inner volume has become interior instead of the sliding volume enclosed the blade. it makes me wonder if my split setting is wrong. is anybody can help?
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Old   February 27, 2011, 17:48
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hello zongtwi,

are you still checking the CFD forum ?
if yes, then i need some help from you for converting my MRF case to Sliding mesh of stirred tank reactor
if you can send me your email adress (to my inbox, if you feel more comfortable) then I can send you the file and the short description that i have with me about it.

hoping for your email
r. roy
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Old   February 21, 2012, 06:11
Default sliding mesh , plz help
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i am using sliding mesh in my work , i am not getting out . i am working on train moving in tunnel . can any body help me. my email is sheikhnasir39@gmail.com
thanks
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Old   January 28, 2013, 05:51
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Hello,

This message has been deleted now.

Last edited by Garima Singh Chauhan; January 28, 2013 at 07:05.
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Old   January 28, 2013, 06:47
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hi,
i am using transient sliding mesh to simulate a fan rotating. The question is: can I see the fan rotating after the simulation?

thanx for your reply
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Old   January 28, 2013, 13:43
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Quote:
Originally Posted by tongnan View Post
hi,
i am using transient sliding mesh to simulate a fan rotating. The question is: can I see the fan rotating after the simulation?

thanx for your reply
Hi,
I don't know if this can be done in fluent post processing, but for sure you can see your fan rotating in tecplot; you have to save at each timestep .cas and .dat files and open them in tecplot.
I simulated in the past a vibromix and it moved up and down.

Daniele
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