CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > FLUENT

Dynamic mesh udf example

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Display Modes
Old   September 15, 2005, 15:08
Default Dynamic mesh udf example
  #1
avant
Guest
 
Posts: n/a
Hi,

Can anyone please post or direct me towards an example udf for dynamic mesh motion Thanks, Avant
  Reply With Quote

Old   September 16, 2005, 01:17
Default Re: Dynamic mesh udf example
  #2
Manoj Kumar
Guest
 
Posts: n/a
Hi

There is an example in fluent tutorial, which uses dynamic mesh. Go through its udf.

Regards,

Manoj
  Reply With Quote

Old   September 16, 2005, 01:24
Default Re: Dynamic mesh udf example
  #3
Manoj Kumar
Guest
 
Posts: n/a
Following udf calculates force acting on a regid body and sets its x-component of velocity. At the end of every time step, the udf is used and the mesh is updated.

#include "udf.h"

static real v_prev = 0.0;

DEFINE_CG_MOTION(block,dt,vel,omega,time,dtime)

{ Thread *t;

face_t f;

real NV_VEC(A);

real force, dv;

/* reset velocities */

NV_S(vel, =, 0.0);

NV_S(omega, =, 0.0);

if (!Data_Valid_P())

return;

/* get the thread pointer for which this motion is defined */

t = DT_THREAD(dt);

/* compute pressure force on body by looping through all faces */

force = 0.0;

begin_f_loop(f,t)

{

F_AREA(A,f,t);

force += F_P(f,t) * NV_MAG(A);

}

end_f_loop(f,t)

/* compute change in velocity, i.e., dv = F * dt / mass

velocity update using explicit Euler formula */

dv = dtime * force / 50.0;

v_prev += dv;

Message ("time = %f, x_vel = %f, force = %f\n", time, v_prev, force);

/* set x-component of velocity */

vel[0] = v_prev;

}

  Reply With Quote

Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Moving mesh Niklas Wikstrom (Wikstrom) OpenFOAM Running, Solving & CFD 122 June 15, 2014 06:20
Dynamic mesh UDF problem Peter FLUENT 2 November 12, 2007 03:10
writing a dynamic mesh udf ALPER ALBAYRAQ FLUENT 0 October 24, 2005 08:41
Problem related with UDF for dynamic mesh Ryan FLUENT 6 April 29, 2004 09:29
UDF problem for dynamic mesh??? lyf FLUENT 1 April 19, 2004 06:43


All times are GMT -4. The time now is 06:56.