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-   -   negative volume with sphere (http://www.cfd-online.com/Forums/fluent/64618-negative-volume-sphere.html)

jafarizade May 17, 2009 05:13

negative volume with sphere
 
hi
i want to model a natural convection over a sphere using fluent. u can see part of my mesh.
http://s2.largeimagehost.com/img/unt...tled1.JPG.html
the problem is that when the fluent is in 2d solve mode the grid check is ok and i have no problem but when fluent is in axisymmetric, the grid check sends negative volume error, i dont know waht is the problem i uses many kindes of mesh types even tri elememts but i cant solve the problem.

Ralf Schmidt May 17, 2009 09:23

Hi!

in 2D axis symmetric, the axis has to be identical with the x-coordinate (so flow from left to right or from right to left).
All points have to be on positive y.

Ralf

Philipov May 21, 2009 03:28

remesh the boundary of the sphere with more nods


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