|December 19, 2010, 18:36||
help debugging Beam deflection UDF
Join Date: Nov 2009
Location: New York
Posts: 4Rep Power: 7
To all those that can help,
I am currently working on a project to use dynamic meshing. the project involves the wake of a cylinder (Karman vortex street) and having a cantilever beam bending in the wake. below is the UDF I have written
I have used the UDF manual and combined info from the CG motion example and the dynamic mesh example. the idea is to use the pressures on the beam to move the beam.
I have attempted multiple options to calculate the force whether by applying a weight/shape function as suggested by a PhD student or by changing the cantilever equation from a point force at the tip to a point force in the center.
every time I run the simulation there is either no bending of the beam or no Karman vortex street. with no dynamic mesh I do get a Karman vortex street.
the fluent setup is laminar, bc's are velocity inlet, pressure outlet - set to 0, outside enclosure wall set to 0 shear, cylinder and beam set to wall with no slip. it is a transient solution based on Strouhal number to get frequency, which correlates to time step. (same way done in the cylinder example.
please note that when i use dynamic mesh preview and a predefined force (cos function) the beam bends as it should.
any help in debugging would be appreciated
Last edited by josik_1982; January 6, 2011 at 02:32.
|Thread||Thread Starter||Forum||Replies||Last Post|
|On debugging a Womersley Profile UDF||david||FLUENT||1||December 2, 2011 05:56|
|UDF - Debugging techniques||PK||FLUENT||2||February 6, 2007 17:44|
|FSI problem with topology of 3D beam via UDF||greg||FLUENT||7||July 17, 2006 06:32|
|UDF debugging||david||FLUENT||1||August 11, 2005 13:43|
|Debugging 3d parabolic udf||david||FLUENT||4||June 13, 2005 15:20|