# [GAMBIT] Rotating Circle in a parrallel plate

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 October 23, 2012, 01:35 #21 Member   Mrinal K R Join Date: Sep 2011 Location: Chennai, India Posts: 45 Rep Power: 5 My geometry is like that. The clearance is very less

 October 23, 2012, 01:36 #22 Super Moderator     Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 2,973 Rep Power: 30 the circle represents your rotating solid? __________________ In memory of my friend Hervé: CFD engineer & freerider

 October 23, 2012, 01:37 #23 Member   Mrinal K R Join Date: Sep 2011 Location: Chennai, India Posts: 45 Rep Power: 5 Yes my circle is rotating and solid

 October 23, 2012, 01:51 #24 Super Moderator     Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 2,973 Rep Power: 30 This is typical reason why you need to post picture of your problem at the beginning. Ok then your annulus will be very thin. Let's say, the outer radius from annulus will split the gap between solid and rectangle into 2 parts __________________ In memory of my friend Hervé: CFD engineer & freerider

October 23, 2012, 02:13
#25
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Mrinal K R
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Sorry, next time I'll post the picture. But all your replies is useful for me.
Now you are telling to split the geometry into two at the annulus region right??

If i split geometry in gambit , is it possible to combine the geometry in fluent??
Attached Images
 Geometry1.jpg (24.3 KB, 13 views)

Last edited by MrinalKR; October 23, 2012 at 02:31.

 October 23, 2012, 02:20 #26 Super Moderator     Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 2,973 Rep Power: 30 no you create your second circle so that the gap between your solid-circle and rectangle-edge will be cutted in half __________________ In memory of my friend Hervé: CFD engineer & freerider

 October 23, 2012, 02:32 #27 Member   Mrinal K R Join Date: Sep 2011 Location: Chennai, India Posts: 45 Rep Power: 5 sorry can you pleas explain?

 October 23, 2012, 02:39 #28 Member   Mrinal K R Join Date: Sep 2011 Location: Chennai, India Posts: 45 Rep Power: 5 Now i just want to rotate the solid body (no sliding mesh) with this current geometry. Next step I'll make sliding mesh.

 October 23, 2012, 03:00 #29 Super Moderator     Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 2,973 Rep Power: 30 no sliding mesh = no rotation or you can use moving mesh or MRF (check points 10 and 11: http://aerojet.engr.ucdavis.edu/flue...g/main_pre.htm) Sans titre1.jpg Sans titre2.png MrinalKR likes this. __________________ In memory of my friend Hervé: CFD engineer & freerider

 October 23, 2012, 03:03 #30 Member   Mrinal K R Join Date: Sep 2011 Location: Chennai, India Posts: 45 Rep Power: 5 Thank you.. :-)

 October 23, 2012, 05:12 #31 Member   Mrinal K R Join Date: Sep 2011 Location: Chennai, India Posts: 45 Rep Power: 5 Do you have any simple tutorials for rotation or sliding meshing??

 October 23, 2012, 05:28 #32 Super Moderator     Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 2,973 Rep Power: 30 check on the web site I mentionned earlier, you can found the tutorials MrinalKR likes this. __________________ In memory of my friend Hervé: CFD engineer & freerider

 October 23, 2012, 05:46 #33 Member   Mrinal K R Join Date: Sep 2011 Location: Chennai, India Posts: 45 Rep Power: 5 I need meshing tutorial. The available tutorials are problems in Fluent solver. Any tutorial is available for meshing in gambit related to moving mesh/rotation?

 October 23, 2012, 06:12 #34 Super Moderator     Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 2,973 Rep Power: 30 MrinalKR likes this. __________________ In memory of my friend Hervé: CFD engineer & freerider

October 23, 2012, 06:16
#35
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Mrinal K R
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i meshed the geometry in gambit. Initially I'm doing MRF ( by giving angular velocity to Circle keeping circle as wall). Can you check the meshing is correct? I split the faces and did meshing.
Attached Images
 Meshing.jpg (93.2 KB, 15 views)

 October 23, 2012, 06:49 #36 Super Moderator     Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 2,973 Rep Power: 30 there is a tool for checking mesh quality in gambit: http://aerojet.engr.ucdavis.edu/gamb....htm#gc_exmesh __________________ In memory of my friend Hervé: CFD engineer & freerider

 October 23, 2012, 07:01 #37 Member   Mrinal K R Join Date: Sep 2011 Location: Chennai, India Posts: 45 Rep Power: 5 Thank you.. Actually there will be no persons for helping. That why asking doubts like this. I'm new to all the cfd modelings. Now i got some idea about (theory) SRF,MRF,sliding mesh and dynamics mesh. Once again thank you.. :-)

October 31, 2012, 02:43
#38
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Mrinal K R
Join Date: Sep 2011
Location: Chennai, India
Posts: 45
Rep Power: 5
Hi
I rotated circle inside the rectangle domain by giving circle as wall with a angular velocity. But I'm not getting required result. As you told earlier giving rotation to the annulus region (fluid) by considering concentric circle is also not possible because of less clearance between circle and rectangle. Is both the method obtain same result??

So can i consider a rectangular region around the circle and giving rotation to the region(shown in fig) between smaller rectangle and circle? Is it possible??
Attached Images
 Fig.jpg (26.9 KB, 6 views)

 October 31, 2012, 04:39 #39 Super Moderator     Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 2,973 Rep Power: 30 you need to set rotation speed on annulus domain, but no rotation to inner circle (solid), since it already belongs to the annulus domain (and consequently has rotation speed) your last method won't work. The easiest way would be to set only the inner circle with velocity (but without moving grid) __________________ In memory of my friend Hervé: CFD engineer & freerider

 October 31, 2012, 04:54 #40 Member   Mrinal K R Join Date: Sep 2011 Location: Chennai, India Posts: 45 Rep Power: 5 But the clearance is very less then how can i make annulus region and meshing it??

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