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-   -   why axisymmetric model space="grid check failed"? (https://www.cfd-online.com/Forums/fluent/41516-why-axisymmetric-model-space-grid-check-failed.html)

 anwar June 26, 2006 04:01

why axisymmetric model space="grid check failed"?

hi all.i'm fluent new user.i have task to analized a 2D model with a TEE form using space model solver axisymmetric.the problem is when i checking the grid it's written "grid check failed".anyone can help me?

 Jason June 26, 2006 07:36

Re: why axisymmetric model space="grid check faile

Most common reason is that you have mesh below the X axis (X Axis MUST be the axis of rotation).

Hope this helps, and good luck, Jason

 Cyril June 26, 2006 09:09

Re: why axisymmetric model space="grid check faile

...or you didn't set your axis as an "axis" in the boundary conditions form (gambit)... (It hapened to me...)

 anwar June 26, 2006 22:10

Re: why axisymmetric model space="grid check faile

how to defined X axis as the axis of rotation?is it in Gambit or fluent?thanks a lot before Anwar

 Jason June 27, 2006 07:55

Re: why axisymmetric model space="grid check faile

In the 2D axisymmetric model, the X axis is the axis of rotation no matter what. You don't have to set it, but you can't change it either. So in Gambit (or whatever program you used to create your mesh) you have to make sure that you model your geometry so that the X axis is coincident with your axis of rotation. What Cyril was talking about is for like the centerline of a pipe (where Fluid touches the axis of rotation). You need to define this as an "axis" boundary condition. You should do this in Gambit when you're defining your other BCs. Also, your geometry has to all lie above the X axis (so your geometry must like where y>=0).

Hope this helps, and good luck, Jason

 chris June 27, 2006 10:38

Re: why axisymmetric model space="grid check faile

You could define it in Gambit, or change the boudary conditon in FLuent. All should work. Hope it helps.

 shashikant June 27, 2006 17:50

okay what about axis of annulus

what if the geometry is annulus and in 2D it is a rectangle placed at a distance away from x-axis there is no real or virtual edge ant y=0 line to be labled as axis .. hope you got my problem.. how do we define the axis now ???

shashikant

 Getachew July 8, 2006 08:30

Re: why axisymmetric model space="grid check faile

-make the axis is parallel to the x-axis. -check the skewness of your grid. Try by changing meshing tyes.

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