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[GAMBIT] Rotate and revolute possible ?

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Old   January 4, 2012, 05:38
Default Rotate and revolute possible ?
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How do i make the part rotate and revolute abt an axis? My problem statement is tool (smaller cylindrical part)needs to rotate by itself as well as rotate around (0,0,0) axis inside another cylinder containing water.I need to see the pressure and velocity variation as the tool moves itself as well as around the axis. Please suggest me how to do it step by step. Also do additional surfaces need to be drawn in gambit so that I can get better display of result in 3d as I need to see the pressure variation of water in the tank at various heights..
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Old   January 4, 2012, 06:01
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can you post a sketch of what you want to build?
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Old   January 4, 2012, 06:31
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It is similiar to the slotted cylinder problem but I need the cylindrical tool in my case to rotate and revolute. Please help me step by step. Also had a doubt in the meshing...I have multiple corner points when I use the fixed or proximity size function i am not able to concentrate the meshing at the gaps/corners..My fig is as folllows
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File Type: jpg kk1.jpg (28.3 KB, 25 views)
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Old   January 4, 2012, 06:35
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First the design: what do you want exactly?
I don't understand the rotate and volute construction.
Do you mean like a spring?
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Old   January 4, 2012, 06:41
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No not like a spring..
I used the sliding mesh shown in figure to only rotate my tool (cylinder with slots) but now I have to make the tool also revolute around the centre axis..(0,0,0). The tool is placed eccentrically at position (0,-1.5,0.8). I hope i make my doubt clear to you..
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Old   January 4, 2012, 07:51
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so you don't need to construct any geometry.
It is only the motion you want to describe?
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Old   January 4, 2012, 09:13
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yes..can we do it in fluent itself or there needs to be some changes in geometry in gambit?
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Old   January 4, 2012, 09:18
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Basically you don't to do something in Gambit, except if you want to work with layering
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Old   January 4, 2012, 09:34
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So could you tell an easy method to perform the motion because I give motion to the rotor domain in sliding mesh formulation which to rotate about its own axis. Then for revolution what can be done. Since I wanted both motions simulatneously..is it a tedious process?
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Old   January 4, 2012, 09:40
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what is exactly your motion?
a cylinder is rotating around its axis, and the axis is also rotating?
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Old   January 4, 2012, 11:09
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yes sir..the axis rotates abt (0,0,0) /
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Old   January 4, 2012, 11:19
Default Embedded Reference Frames
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This problem can be classified as Embedded Reference Frames and can be solved by two methods:

1. Steady State Multiple Reference Frame (MRF) Modeling
2. Sliding Mesh ---> However for this method you need UDF (I shall share this along with sample mesh files, boundary conditions, sample solution and other helping material)

First you must decide which method you would prefer. If I were you I would have choose the first method and later on move to later method if needed.
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Old   January 4, 2012, 11:31
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your problem looks like this one?

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Old   January 4, 2012, 14:59
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thks for your time...yes sir it is similiar to the picture you provided.. i am doing a 3d geometry with submerged cylinder ..ill use steady mrf...can u suggest the methodology ...

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Old   January 5, 2012, 16:35
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far...can you give more info on how to embedded ref
frame motion?
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Old   January 13, 2012, 13:57
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here is the solution. This problem can also be solved using the sliding mesh, but you need UDF (I have it)





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Old   January 20, 2012, 05:12
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I did as you said and made my slotted cylinder walls as interfaces but there are some problems..there are more than 18 faces which I need to make as interfaces...is that right? My geometry is attached herewith
http://www.mediafire.com/?7uho78575kbfap8

The flow is not observed near the slots...could you help me with the meshing of the volume meshing please..the tool is of r=0.285m and ht 0.4m and slots r=0.02m placed in a tank of r=2.6m,h=3.2. The tool is placed at z=0.8m from top of tank and y=-1.5

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Old   January 24, 2012, 20:54
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Please help me in solving the meshing near the slots because flow near the slots is not differentiated with respect to the other cylindrical surfaces. Kindly help.
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Old   January 25, 2012, 10:07
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Ok, I shall check it today
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Old   January 27, 2012, 00:36
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Thanks...i am eagerly waiting for your reply..
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