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January 19, 2013, 14:10 |
geometry and griding a stirred tank
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#1 |
New Member
Meen
Join Date: Jan 2013
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I am trying to create a geometry of a stirred tank with rushton turbine in gambit to simulate in fluent, i have created the geometry through create volume option then i have united the volumes of the shaft, disc and blades to one volume and this volume is subtracted from the tank + baffle volume. I donot know what i have done is correct or incorrect i need to apply sliding mesh method in fluent but do not know how to grid the stirred tank.
this is my first post please somebody helpme. is there a tutorial available for geomerty, griding, mesh for stirred tank in gambit or elsewhere pls guide me. |
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January 22, 2013, 10:58 |
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#2 | |
Senior Member
Rick
Join Date: Oct 2010
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Quote:
Zone1 will rotate, zone2 will remain static: proper sliding is ensured by interfaces. Daniele |
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January 22, 2013, 11:54 |
[Gambit] geometry and griding a stirred tank
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#3 |
New Member
Meen
Join Date: Jan 2013
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Hi Daniele,
thank you for your reply. When i create a volume near the impeller the volume of the tank get divide in two part while meshing the outer portion do i need to create more volumes such that the outer part is covered cant i mesh it directly. Also since i have united the volumes of the Blade and disc. i am not able to mesh the common faces between the blade and the disc. The sliding and the stationary zones and the interfaces have to define in Gambit or in Fluent once again i thank you for your reply. Pls let me know if i am going wrong somewhere. regards meen |
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January 22, 2013, 12:36 |
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#4 | |
Senior Member
Rick
Join Date: Oct 2010
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Quote:
I don't understand very well your questions. I'm attaching a sketch of what you have to do. Interfaces are defined in gambit in boundary conditions, then in fluent you have to couple interface1 with interface4, interface2 with interface5 and interface3 with interface6. You can split more the volumes to control the mesh, but in zones definition, in gambit you have to set only 2 different zones, as represented in the picture. Daniele |
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January 23, 2013, 02:52 |
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#5 |
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Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
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In complement to Daniele's advices, I add that your both volumes have to be disconnected.
copy and move trick always helped me (copy rotor volume anywhere, delete original volume . Enjoy this exotic rotor's placement for setting rotor interfaces (and also stator's ones). And finally move back. Now volumes are disconnected and interfaces are properly defined)
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In memory of my friend Hervé: CFD engineer & freerider |
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February 10, 2013, 03:03 |
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#6 |
Senior Member
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Q1: Is this necessary to create the sliding mesh interface (I do believe so). What will happen if we model this as single rotating reference frame similar to rotor with stationary casing?
Q2: Will there be any difference in results from both approaches? Q3: How far interfaces should be placed? |
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February 10, 2013, 10:53 |
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#8 | |
Senior Member
Rick
Join Date: Oct 2010
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Quote:
It depends: in general, sliding mesh approach will give the best approximation; as said before, if you have a simple tank with a central shaft/impeller, results should be similar. This is the first question I tell to myself when approaching for the first time this type of problem: however, there's not a rule: simply your volume must contain the impeller. Results should not change too much in respect of the size of the volume surrounding the impeller. Yes, it seems correct to me. Daniele |
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October 15, 2013, 03:20 |
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#9 |
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tarang
Join Date: Jul 2012
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Can anyone please mail me the tutorials for drawing the geometry of stirred tank with baffles???
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October 16, 2013, 04:44 |
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#10 |
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Rick
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October 16, 2013, 05:18 |
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#11 |
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tarang
Join Date: Jul 2012
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Thanks Daniel for your reply.
Can you just let me know the steps if you have worked on it... Regards Tarang |
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October 16, 2013, 05:57 |
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#12 |
Senior Member
Rick
Join Date: Oct 2010
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I usually work on autocad to build my geometries and then import them in gambit.
Just draw the vessel, (cylinder, cylinder+cone or whatever), then draw the impeller. It's simpler to use some tools such as sweep, extrude, etc. (these are available in gambit too). It's not simple to explain "how to draw" your geometry Daniele |
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May 22, 2014, 13:46 |
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#13 | |
New Member
Vivekananda Bal
Join Date: May 2014
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Quote:
Will i have to use moving mesh for stirrer as well as zone 1? |
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