Nowdays I am learing about dynamic mesh ,but I can not find some information about it,especially about the udf in dynamic mesh ,can someone help me ?Give me some example about dynamic mesh ,my E-Mail:windman09@126.com Thank you

I use dynamic meshing extensively and am learning the hard way. I am happy to share my experience of udfs if it helps, but what is the specific problem - have you read the users guide?

hi, i am traying to move a piston in a closed cylinder. i wrote a udf, but i do not know the problem. the udf is: #include "udf.h" DEFINE_CG_MOTION(PISTON,dt,vel,omega,time,dtime) { vel[0]=0.1; vel[1]=0; omega[0]=0; omega[1]=0; }

please if u know whre the problem tell me

Hi Nour,

No idea about your udf sorry, however you could try my lazy technique: make a copy of the udf from the poppet valve dynamic mesh tutorial. Change the input values, fiddle with the equations and hey presto, a stress-free udf.

Shuto.

If the poppet valve example is not quite what you are after there are loads of examples in Fluents udf archives:

http://www.fluentusers.com/udf_archi...ples/index.htm

hi, thank u very much for your advice...but the problem is that i searched in the documentation, i found the tutrial of poppet valve but not the valve.c....it is not copied in the surver in the uni. can u please send me i example of this udf... thank u nour