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-   -   Natural convection in vertical tube (http://www.cfd-online.com/Forums/fluent/38494-natural-convection-vertical-tube.html)

Ravi November 4, 2005 05:49

Natural convection in vertical tube
 
why do we get the message "non-positive area exists" when we do grid check in fluent. I've created an uniform mesh of 1 cm spacing in a rectangular area of 0.2 by 1 m. what to do when this message comes? anyone please help me.

Jeremy November 4, 2005 10:22

Re: Natural convection in vertical tube
 
Did you use Gambit to create the mesh? Is this a 2D or 3D case?


Ravi November 5, 2005 04:41

Re: Natural convection in vertical tube
 
Yes i used GAMBIT for meshing. it is 2D case.

Jeremy November 7, 2005 11:28

Re: Natural convection in vertical tube
 
Ok, there is not a lot of info to go by here. Did you check the grid quality as well in Gambit?

The "non-positive area" can occur during meshing when the meshing scheme ends up causing cell boundaries to cross. I have seen this happen in highly curved surfaces when using a boundary layer. But you seem to have a very simple case.

Is this an axisymmetrical domain?


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