CFD Online Discussion Forums

CFD Online Discussion Forums (
-   FLUENT (
-   -   Dynamic Mesh, (Define_Geom) UDF (

ROOZBEH February 10, 2007 19:17

Dynamic Mesh, (Define_Geom) UDF
Dear FLUENT 6.2 user;

Can I use define_geom function to define a time dependent geometry?

I want to model the 2D flow field around a rigid plate (or line in 2D), oscillates (in a specific angular interval) around one of its edges.

with the best regards, ROOZBEH

soe February 27, 2007 03:16

Re: Dynamic Mesh, (Define_Geom) UDF

You're modelling a rigid plate so DEFINE_GEOM is a good macro for that. You can use it to prescribe angular velocity of the rotation, so yeah the orientation will be time dependent. I don't quite get what you mean by oscillation around the edges though, that sounds like it's a 3D problem. As far as I understand DEFINE_GEOM cannot provide relative movement between nodes(ie. non-rigid body), for that you use DEFINE_GRIDMOTION. In other words DEFINE_GEOM can only change the orientaion of a dynamic zone, and not the actual shape of it.

linch August 28, 2009 05:52


Originally Posted by soe
for that you use DEFINE_GRIDMOTION.

I can't find any Informations about DEFINE_GRIDMOTION neither in the Fluent manual nor in the internet. Could somebody please help me?

Thanks in advance!

linch August 28, 2009 08:28

Ok, it's already done.


All times are GMT -4. The time now is 16:11.