有没有了解fluent udf编程中dpm erosion 的，能不能辅导我一下，有偿

部分代码
include "udf.h"
#include "dpm.h"
#include "mem.h"
#include <stdio.h>
#include <stdlib.h>

#define p_Ela_mol 3.6e11
#define p_sur_vos 0.15
#define p_den 1550
#define angle_cri 1.27
#define p_po 0.23
#define vn_y 7.5
Domain *domain;
enum
{
NUM_OF_HITS,
AVG_DIAMETER,
AVG_RADI_VELO,
PARV,
PART,
ACCMELT,
ACCIMP,
NUM_OF_USED_UDM
};

int UDM_checked=0;

void reset_UDM_s(void);

int
check_for_UDM(void)
{
Thread *t;
if(UDM_checked)
return UDM_checked;