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Old   December 12, 2012, 17:36
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kris pani
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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
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Old   December 13, 2012, 10:50
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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).

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Old   December 13, 2012, 12:14
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Thank you Daniele !

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Old   December 14, 2012, 08:05
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ali m
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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
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Old   December 14, 2012, 08:18
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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.
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Old   December 15, 2012, 03:34
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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
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Old   December 15, 2012, 10:29
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Quote:
Originally Posted by ali_mehrabi69 View Post
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.

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