[zhihuawan]

Originally Posted by ghorrocks

You are running a free surface simulation with surface tension. You will find that to get this to converge you will need amazingly small time steps. Surface tension modelling increases the simulation's sensitivity to time step size. So try smaller time steps. Even better, use the adaptive time steps I recommended before (adaptive time steps works very well for this class of simulations).

long time no see you,I now meet a problem about udf,can you help me?when I interpret it to the fluent,it gives errors "error:E:fluent/volume.c;line 28arse error." The udf are as follows:

/************************************************** *********************
udfexample.c
UDF for specifying volume profile boundary condition
************************************************** **********************/

#include "udf.h"

DEFINE_PROFILE(inlet_volume, thread, position)
{
real x[ND_ND]; /* this will hold the position vector */
real y, h;
face_t f;
h = -0.0009; /* inlet height in m */
begin_f_loop(f,thread)
{
F_CENTROID(x, f, thread);
y = x[1];
if (y<h)
{
F_PROFILE(f, thread, position) =1;
}
else {
F_PROFILE(f, thread, position) =0;
}
end_f_loop(f, thread)

}

[ghorrocks]

Try the fluent forum.