[vishnu123]

Hallo Everyone,
I am trying to plot a Integral length scale contour of an LES simulation in Ansys fluent. I have tried to plot I just just find Sub grid scale length for LES but nothing for RANS, but I am looking for integral scale using k and epsilon.

I have written an UDF function as follows:

#include "udf.h"

DEFINE_ON_DEMAND(integral_length_scale)
{
Domain *domain;
real k, epsilon, L;
Thread *t;
cell_t c;

domain = Get_Domain(1);

/* Loop through all cells in all threads */
thread_loop_c(t, domain)
{
begin_c_loop(c, t)

k = C_K_L(c, t);
epsilon = C_R_G(c, t)[1];
L = pow(k, 1.5) / epsilon;

/* Store the calculated value of L in C_LENGTH_SCALE */
C_LENGTH_SCALE(c, t) = L;

end_c_loop(c, t)
}

Message("Integral length scale calculated successfully!\n");
}


But I am getting an error as C_LENGTH_SCALE: undefined variable.