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xujinchao
ͳæ (СÓÐÃûÆø)
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/*************************************************************** UDF for customizing the Gidaspow drag law in Fluent ****************************************************************/ #include "udf.h" #include "sg_mphase.h" #define diam2 1.7e-5 DEFINE_EXCHANGE_PROPERTY(custom_drag_syam, cell, mix_thread, s_col, f_col) { Thread *thread_g, *thread_s; real x_vel_g, x_vel_s, y_vel_g, y_vel_s, abs_v, slip_x, slip_y, rho_g, rho_s, mu_g, reyp, afac, bfac, void_g, vfac, fdrgs, taup, k_g_s; thread_g = THREAD_SUB_THREAD(mix_thread, s_col); thread_s = THREAD_SUB_THREAD(mix_thread, f_col); x_vel_g = C_U(cell, thread_g); y_vel_g = C_V(cell, thread_g); x_vel_s = C_U(cell, thread_s); y_vel_s = C_V(cell, thread_s); slip_x = x_vel_g - x_vel_s; slip_y = y_vel_g - y_vel_s; rho_g = C_R(cell, thread_g); rho_s = C_R(cell, thread_s); mu_g = C_MU_L(cell, thread_g); /*compute slip*/ abs_v = sqrt(slip_x*slip_x + slip_y*slip_y); /*compute reynolds number*/ reyp = rho_g*abs_v*diam2/mu_g; /* compute particle relaxation time */ taup = rho_s*diam2*diam2/18./mu_g; void_g = C_VOF(cell, thread_g);/* gas vol frac*/ /*compute drag and return drag coeff, k_g_s*/ afac = pow(void_g,4.14); if(void_g<=0.85) bfac = 0.8*pow(void_g, 1.28); else bfac = pow(void_g, 2.65); vfac = 0.5*(afac-0.06*reyp+sqrt(0.0036*reyp*reyp+0.12*reyp*(2.*bfac- afac)+afac*afac)); fdrgs = void_g*(pow((0.63*sqrt(reyp)/vfac+4.8*sqrt(vfac)/vfac),2.))/24.0; k_g_s = (1.-void_g)*rho_s*fdrgs/taup; return k_g_s; } |
2Â¥2015-08-12 23:22:34
xujinchao
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3Â¥2015-08-13 14:48:13
aaaalu
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4Â¥2015-12-07 22:09:48














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