rotation

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 December 12, 2012, 17:36 rotation #1 New Member   kris pani Join Date: Mar 2012 Location: Greece Posts: 14 Rep Power: 5 Hello, I want your advice.. I am trying to simulate heat transfer in a natural convection problem. My cylinder can is on a rotating disc.. I don't get the results I want, so I am asking you: Do I have to use the Frame Motion option from Cell Zone Conditions in order to put the rotation speed and the Rotation-axis direction or I have to use the option Moving wall fron Boundary Conditions. Maybe both of them? Thank you.. K.P

 December 13, 2012, 10:50 #2 Senior Member     Daniele Join Date: Oct 2010 Location: Italy Posts: 918 Rep Power: 15 you can use moving wall only if you have a surface of revolution (a cylinder is a surface of revolution); you can't use moving wall for the other cases (ex: rushton impeller, which is not a surface of revolution). Daniele

 December 13, 2012, 12:14 #3 New Member   kris pani Join Date: Mar 2012 Location: Greece Posts: 14 Rep Power: 5 Thank you Daniele ! K.P

 December 14, 2012, 08:05 rotation #4 New Member   ali m Join Date: Oct 2012 Posts: 8 Rep Power: 4 I am modeling an air turbine in millimeter dimension. and have a problem with these rotation setting! what should i do? should i set a rotation velocity in cell zone condition for that region(the zone that is rotating)?or in wall rotation in boundary condition? or both of them? please answer me!! Thank u

 December 14, 2012, 08:18 #5 Senior Member     Daniele Join Date: Oct 2010 Location: Italy Posts: 918 Rep Power: 15 Set an absolute rotational velocity to cell zone adiacent to your rotating turbine, then set the walls inside this cell zone to rotate with 0 relative velocity. ali_mehrabi69 likes this.

 December 15, 2012, 03:34 hey #6 New Member   ali m Join Date: Oct 2012 Posts: 8 Rep Power: 4 yeah i think you are true but, how do i know (for design), how much of the cell zone, should be in rotating zone?maybe just near the turbine?or a bit far or ...? how much? tanx

December 15, 2012, 10:29
#7
Senior Member

Daniele
Join Date: Oct 2010
Location: Italy
Posts: 918
Rep Power: 15
Quote:
 Originally Posted by ali_mehrabi69 yeah i think you are true but, how do i know (for design), how much of the cell zone, should be in rotating zone?maybe just near the turbine?or a bit far or ...? how much? tanx
Theorically the results don't change in respect to the rotating zone size; your rotating zone must only include your rotating element.

Daniele

 Tags natural convection, rotation

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