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[求助] 预混燃烧模型的UDF的解释

在UDF的帮助文件中,预混燃烧模型中的源项的udf代码为:
#include "udf.h"
#include "sg_pdf.h" /*not included in udf.h so includr here */   

DEFINE_TURB_PREMIXED_SOURCE(tur_premixed_src,c,t,tur_flame_speed,source)
{
   real up = TUR_VEL_SCAL(c,t);
   real ut, ul, grad_c, rho_u, X1, DV[ND_ND];
   ul = C_LAM_FLAME_SPEED(c,t);
   Calculate_unburnt_rho_and_X1(t, &rho_u, &X1);
   if(NNULLP(THREAD_STORAGE(t,SV_PREMIXC_G)))
   {
       NV_V(DV, =, C_STORAGE_R_NV(c,t,SV_PREMIXC_G));
       grad_c = sqrt(NV_DOT(DV,DV));
   }
   ut = ul*sqrt( 1. + SQR(up/ul));
   *turb_flame_speed = ut;
   *source = rho_u*ut*grad_c;
}
其中,Calculate_unburnt_rho_and_X1(t, &rho_u, &X1);
   if(NNULLP(THREAD_STORAGE(t,SV_PREMIXC_G)))
   {
       NV_V(DV, =, C_STORAGE_R_NV(c,t,SV_PREMIXC_G));
       grad_c = sqrt(NV_DOT(DV,DV));
   }可以详细解释一下吗?
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