Read txt file with udf
 

I need write a udf or open a file with velocity values... (like a the file created when I do Fille-->write-->profile) , asociated to boundary that I choose, and that these values will be the "conditions" in the boundary at the start of the each time step. Any idea?
Thanks in advance !


Laura

Hi Laura!
About writing an output UDF u have to use the function hook "execut-at-and" and in the body of ur UDF u would includ a file for postprossecing as 'txt ro dat' format, then u will a have a file contain a postprocessing of the parameters that u need at each time step.

Hi all!

I'm facing the same problem. I have a .txt file (with coordinates and variables (velocity) values) wich is changing every time step, so It's so frustrating to use GUI 'define profile' in each tstep.

I have thought of creating a UDF for that, but I have not found nor fluent manual either UDF manual how to do that... Do anyone know if it is really feasible??

Thank you in advance!!

Hi dahmen! Thanks for your reply.
I use an UDF with "execut-at-end" for save data of a boundary that I choose. But I need "read" these saved data, in other boundary. I think that I may do with DEFINE_ADJUST, but I don't have more ideas...

This is the part to write data, I need do something like that to read data into other id boundary. :confused:

DEFINE_EXECUTE_AT_END(name)
{
Domain *domain;
domain = Get_Domain(1);
file = fopen("2D_IZQUIERDA.PROF", "w");
name_void(domain, 10);
fclose(file);
}

rayolau,

Did you found out how to read the velocity data file and use as a BC to the case?
I am trying to do the same thing, but I'm having problems with that. I'm not new using UDF.
I have a file with a list of velocity values. Each velocity for one specific time and I need to read this file and set the velocity as the BC at that specific time.
If you could help me..
Thank you..

Look at DEFINE_PROFILE macros for BC

Best regards