# who can help me about my udf on piston...

 User Name Remember Me Password
 Register Blogs Members List Search Today's Posts Mark Forums Read

 May 14, 2008, 11:34 who can help me about my udf on piston... #1 sweetcherry Guest   Posts: n/a hi,every one, i have to use udf on my research, i read many information about udf,but i still don't know what's the problem in my case. when i do iterate the case, it will shows the error.i think it is the udf problem. i hope someone can help me to tell me where the problem is ! here is my udf! #include #include "udf.h" # define UDF_FILENAME "piston.dat" # define PI 3.141592654 FILE *fp; //6 DEFINE_CG_MOTION(pistona, dt, cg_vel, cg_omega, time, dtime) { Thread *t=DT_THREAD (dt); face_t f; real force, loc; real velo, pressure; // real v1, v2, v3; fp= fopen("piston.dat","w"); NV_S(cg_vel,=,0.0); NV_S(cg_omega,=,0.0); if (!Data_Valid_P ()) return; force=0.0; begin_f_loop(f,t) { real *AA; AA = F_AREA_CACHE (f, t); force += F_P (f, t) * AA[0]; } end_f_loop (f, t) if (rp_axi) force *= 2.0 * M_PI; pressure = force / 0.0099*0.0099*M_PI; # define rp 0.0067 # define l1 0.079 # define rpm 500. / # define w 2.*PI*rpm/60. # define q w*dtime velo = rp*w*sin(PI/2.-q)+1./sqrt(2.*rp*cos(PI/2.-q)* 2.*rp*cos(PI/2.-q)-4.*(rp*rp-l1*l1))*(2.*rp*cos(PI/2.-q)) *rp*sin(PI/2.-q)*(w); loc = 0.01945+0.02+rp*cos(PI/2.-q)+0.5*sqrt ((2.*rp*cos(PI/2.-q))*(2.*rp*cos(PI/2.-q))-4.*(rp*rp-l1*l1)); fprintf (fp, "%e %e %e %e\n", time, loc, velo, dtime); cg_vel[0]=velo; fclose (fp); message ("\nUDF valve: time = %f, loc(m)= %f, velo = %f, dtime = %f\n", time, loc ,velo,dtime); }

 May 15, 2008, 01:48 Re: who can help me about my udf on piston... #2 mAx Guest   Posts: n/a what is exactly the error message? (while solving? while compiling?)

 Thread Tools Search this Thread Search this Thread: Advanced Search Display Modes Linear Mode

 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 OffTrackbacks are Off Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post venus FLUENT 1 May 28, 2014 10:37 Dante CFX 4 May 28, 2012 06:08 Amida Oluwole Main CFD Forum 0 June 12, 2007 06:12 A Student Siemens 0 April 18, 2006 11:36 Arpan Siemens 1 March 9, 2006 07:52

All times are GMT -4. The time now is 07:50.

 Contact Us - CFD Online - Privacy Statement - Top