[Fattening_soul]

Hi I am working on a 90 degree elbow erosion problem using UDF. The erosion model of E/CRC is used in it, and I wrote it using a simple program. as follows:
#include "udf.h"
#include "math.h"

DEFINE_DPM_EROSION(moshi, p, t, f, normal, alpha, Vmag, mdot)
{
real A[ND_ND];
int num_in_data;
Thread* t0;
cell_t c0;
t0 = THREAD_T0(t);
c0 = F_C0(f, t);

real erosion;
real a = alpha;
real v = Vmag;
real F_alpha;
real V;
real F;

V = pow(v, 2.41);
F = 5.3983 * pow(a, 1) - 10.1068 * pow(a, 2) + 10.9327 * pow(a, 3) - 6.3283* pow(a, 4) + 1.4234 * pow(a, 5);
erosion = 1 * 2.17 * pow(10, -7) * pow(160, -0.59) * V * F;

F_STORAGE_R_XV(f, t, SV_DPMS_EROSION, EROSION_UDF) = erosion;

}


But the erosion rate I get when verifying the experimental papers through FLUENT is always an order of magnitude higher, and I don't know what's wrong with the UDF. Thank you all so much for answering this question for me.