[lehoanganh07]

Hi,
I have simple UDF to modify the turbulence viscosity as the program below. I want to know the code is work or not. So I put an message to print on the screen. But the message did not print out.

#include "udf.h"
#include "math.h"
#include "mem.h"

DEFINE_TURBULENT_VISCOSITY(reboud_mut,cell,thread)
{
#if PARALLEL
real mut;
real rhol=995.7;
real rhov=0.03009;
real cmu = 0.0845;
real damp;
real a1;
real k =C_K(cell,thread);
real d =C_D(cell,thread);
a1=(C_R(cell,thread)-rhov)/(rhol-rhov);
damp=rhov+(rhol-rhov)*pow(a1,10);
mut=damp*cmu*k*k/d;
return mut;
Message("update turbulence vis %g\n",mut);
#endif
}

Please help me how to print the message !
Thank you !

[Sun]

wouldn't it be better to store "mut" in an UDMI and monitor it via GUI rather than printing it out?
Cheers!

[lehoanganh07]

Originally Posted by Sun

wouldn't it be better to store "mut" in an UDMI and monitor it via GUI rather than printing it out?
Cheers!

Thank you for your quick answer!

I try like this: C_UDMI(c,t,0)=mut

but I dont know how to monitor via GUI

[Sun]

you can do it like any other solution variables such as pressure, velocity etc. Imagine you are monitoring the velocity over time on a surface, line or the entire domain, instead of velocity select UDMI0. Have a look at Step3 of this tutorial:

http://www.arc.vt.edu/ansys_help/flu_tg/x1-210002.13.html


in "Field Variable" drop down menu select UDMI0.
cheers!

[lehoanganh07]

Thank you very much!
This is really helpful for me.

[upeksa]

"Return" it is used for exiting the function, so when your code reach the line "Message", your code skips that line.

If you print the message and the you use "return", it will work.