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-   -   use sliding mesh to simulate unsteady flow (http://www.cfd-online.com/Forums/fluent/35026-use-sliding-mesh-simulate-unsteady-flow.html)

annie November 8, 2004 14:01

use sliding mesh to simulate unsteady flow
 
hello, everyone. I use Fluent to simulate the unsteady flow. I have seperately produced the mesh for rotor and stator( I have assumed, dass they have the same blade numbers). And I merge the mesh for the rotor and stator.

But when i read the merged mesh in Fluent, and want to set the interface Boundary conditions. Error appear: Boundaries too far apart.

Who know, what is the problem? Thanks very much! Regards, Annie

Domi November 9, 2004 05:05

Re: use sliding mesh to simulate unsteady flow
 
Perhaps there is a tiny gap between the two domains that you don't see in the graphics window but that nevertheless is there . Are you sure you merged the meshes correctly?

annie November 9, 2004 07:03

Re: use sliding mesh to simulate unsteady flow
 
hello,Domi. Must the interface (outlet of rotor and inlet of stator) completely be the same( X,Y,Z value)? You know, the mesh of rotor and stator is produced seperately(using Turbo). How can you control the geometry of interface?

Domi November 9, 2004 08:48

Re: use sliding mesh to simulate unsteady flow
 
Both domains have got to have an interface and both interfaces must be coinciding. They must have the same coordinates, I think. You generate the grids separately in Gambit or other software and then you put them in the right position using the tmerge command (cfr. fluent manual). That is the way I do it. I hope it works for you to.


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