CFD Online URL
[Sponsors]
Home > Forums > FLUENT

Writing the area-weighted average value in file

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

Reply
 
LinkBack Thread Tools Display Modes
Old   November 1, 2006, 07:42
Default Writing the area-weighted average value in file
  #1
Shamsi
Guest
 
Posts: n/a
Hi, I am solving a unsteady scalar equation. After each time step, I want to write area-weighted average value of scalar at outlet surface in a file. Thanks in advance. Regards, Shamsi

  Reply With Quote

Old   November 2, 2006, 05:27
Default Re: Writing the area-weighted average value in fil
  #2
kenischi
Guest
 
Posts: n/a
no problem

easiest-way:

go surface-table, choose your size (area-weighted average value) and your related surface,switch to time-step and choose "write" option...edit your file post solution with an editor

others

sure shemes and udfs

kenischi
  Reply With Quote

Old   November 2, 2006, 21:47
Default Re: Writing the area-weighted average value in fil
  #3
Shamsi
Guest
 
Posts: n/a
Thanks Kenischi I am solving a concentration transport equation. Velocities are known. Presently, I am solving the equation for one time step. Then I go to report, then I select surface integrals after that in the Report type I select Mass Weighted Average, in the filed variable I selct User defined scalar (User Scalar 0) and for the surface I select outlet, and then press button for compute. Right Now I am able to get the values for one time step. Is there is any way this value can be written in a file for several time steps?. Thanks in advance.

Regards, Shamsi
  Reply With Quote

Old   November 6, 2006, 04:52
Default Re: Writing the area-weighted average value in fil
  #4
Shamsi
Guest
 
Posts: n/a
Hi, I have found the solution. I click on solve, then on monitor, then on surface, and then define the rest and file name. Thanks, Regards, Shamsi
  Reply With Quote

Old   November 8, 2006, 06:08
Default Re: Writing the area-weighted average value in fil
  #5
Shamsi
Guest
 
Posts: n/a
Hi, If we write the area-weighted average value in a monitor file, it size is becoming bulky, because its write the value for each and every iterations per step. It is better to write UDF. Any help. Regards, Shamsi
  Reply With Quote

Old   November 12, 2006, 23:49
Default Re: Writing the area-weighted average value in fil
  #6
Shamsi
Guest
 
Posts: n/a
Hi, Everybody, Following UDF writes the values of final current time without writing the values of iteration per time step. This is unlike the writing in the monitor files, where it writes iteration per step also. Regards, Shamsi

#include "udf.h" int kount = 0; /* define global variable kount */ int kkk,min,max; real ss[200],ss1; DEFINE_ADJUST(demo_calc,d) { cell_t c;

Thread *t; kkk=1; if (kount > 1 ) {

ss1=ss[kount];

printf("Cuurent_Time = %f %f\n",ss[kount],ss1);

if(CURRENT_TIME > ss1) kount++;

ss[kount]=CURRENT_TIME;

max=kount;

printf("kount = %d\n",kount); } else if (kount > 0) {

if(CURRENT_TIME >ss1)

{

kount=kount+1;

ss[kount]=CURRENT_TIME;

ss1=ss[kount];

printf("kounmid = %d\n",kount);

}

else

{

ss1=ss[kount];

printf("Cuurent_Time = %f %f\n",ss[kount],ss1);

if(CURRENT_TIME > ss1) kount++;

ss[kount]=CURRENT_TIME;

printf("kountmidins = %d\n",kount);

}

}

else {

kount=kount+1; ss[kount]=CURRENT_TIME;

kkk=0;

ss1=CURRENT_TIME;

printf("kountinside = %d\n",kount);

printf("timetinside = %f\n",ss1);

min=kount;

} } DEFINE_RW_FILE(writer,fp)

{

FILE *fd;

Thread *t;

face_t f;

real sss,A[ND_ND];

fd=fopen("data.txt","w"); /* begin_f_loop(f,t)

{

sss=F_U(f,t);

} */

for ( kkk=min ; kkk <=max; kkk++)

{

sss=F_AREA(A,f,t);

printf("Writing UDF data to data file...\n");

printf("%f %f",ss[kkk],sss); /* write out kount to data file */

fprintf(fd,"%f\n",ss[kkk]); /* write out kount to data file */

} } DEFINE_DIFFUSIVITY(udsdiffusivity, c, t, i) { return C_MU_T(c,t)+.006482; }

  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
Area weighted or mass weighted average SAM Main CFD Forum 23 March 4, 2014 13:37
pisoFoam compiling error with OF 1.7.1 on MAC OSX Greg Givogue OpenFOAM Programming & Development 3 March 4, 2011 18:18
OpenFOAM 1.7.1 installation problem on OpenSUSE 11.3 flakid OpenFOAM Installation 16 December 28, 2010 09:48
1.7.x Environment Variables on Linux 10.04 rasma OpenFOAM Installation 9 July 30, 2010 05:43
DxFoam reader update hjasak OpenFOAM Post-Processing 69 April 24, 2008 02:24


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