Learning Forum

[axt5488]

Hello everyone

I am trying to model a gaussian laser heat source as a moving volumetric heat source. When I tired to compile the UDF I received an error and a warning below:

Source5.c(19,1): warning: type specifier missing, defaults to 'int' [-Wimplicit-int]

DEFINE_SOURCE(heat_source, c, t, time, dS, eqn)

^

Source5.c(19,14): error: expected ';' after top level declarator

DEFINE_SOURCE(heat_source, c, t, time, dS, eqn)

       ^

       ;

2 warnings and 2 errors generated.

scons: *** [Source5.obj] Error 1

scons: building terminated because of errors.

/*Here is the UDF*/

#include "udf.h"

#include "math.h"

#include "metric.h"

#include "sg.h"

#include "sg_mphase.h"

#include "mem.h"

#include "sg_mem.h"

#include "flow.h"

#include "unsteady.h"

#define A 0.24  /*Absorption coefficient*/

#define P 400   /*Laser Power*/

#define re 0.1  /*radius on top*/

#define ri 0.2  /*radius on bottom*/

#define zi 0.05  /*cone length parameter lower z axis*/

#define ze 0.1  /*cone length parameter upper z axis*/

#define v1 1200  /*laser velocity*/

#define v2 1200  /*laser velocity*/

#define pi 3.1415;

DEFINE_SOURCE(heat_source, c, t, time, dS, eqn)

{

real coord[ND_ND];

real x, y, z;

C_CENTROID(coord, c, t);

real xC = 0, yC = 0, zC = 0; /*initial position of the heat flux*/

real t0 = 3;         /*the time that the heat flux is stationary*/

real time;

real H = zi - ze;

real r0;

r0 = re + ((ri - re) / H) * (z - ze);

real Q0;

Q0 = (6 * A * P) / (pi * -H * ((re*re) + (re * ri) + (ri*ri)));

real Q;

Q = Q0 * exp(-1 * (((x - v1 * time) ^ 2 + (y - (v2*time)) ^ 2) / r0 ^ 2);

if (time < t0)

{

x = xC;

y = yC;

z = zC;

dS[eqn] = 0.0;

}

else

{

time = time - t0;

x = xC + v1 * time;

y = yC + v2 * time;

z = zC;

dS[eqn] = 0.0;

}

return source

}

Is anyone can figure out how can I solve this error and warning?

[Rob]

The error is linked to
Source5.c(19,14): error: expected ';' after top level declarator
DEFINE_SOURCE(heat_source, c, t, time, dS, eqn)
and implies there's a ";" either missing or where it shouldn't be. Typically the error is triggered for the line after the code mistake. Whether that'll fix both errors is a different question.