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Å·ÀË«Á÷ÌåÄ£ÐÍ×Ô¶¨ÒåÒ·Á¦ÏµÊý£¬ÏÖÔÚÒ·Á¦ÏµÊýÄ£ÐÍÊÇCD=CD0 *£¨-31.4565+32.4451void_g); £¨ÆäÖУ¬CDΪҷÁ¦ÏµÊý£¬CD0Ϊµ¥¿ÅÁ£Ò·Á¦ÏµÊý£¬void_gÊÇ¿Õ϶ÂÊ£¬ÇëÎÊÓÃudfÔõô±àд£© DEFINE_EXCHANGE_PROPERTY(custom_drag_syam, cell, mix_thread, s_col, f_col) ºê·µ»ØÖµµ½µ×ÊÇʲô¶«Î÷£¿£¿ÊÇÒ·Á¦£¬»¹ÊÇÒ·Á¦ÏµÊý£¬£¬»¹ÊÇʲô±ðµÄ¶«Î÷£¿£¿Çó½â Èç¹ûÎÒµÄÓÃDEFINE_EXCHANGE_PROPERTY(custom_drag_syam, cell, mix_thread, s_col, f_col)±àд£¬ÊÇÖ±½Óreturn CD=CD0 *£¨-31.4565+32.4451*void_g)Â𣿣¿ ÎÒ·ÔıðÈ˵ÄÈçÏ /* This is a routine for customizing default Syamlal drag law in Fluent 6. The default drag law uses 0.8 (for void<=0.85) and 2.65 (void>0.85) for bfac. This is for a min fluid vel of 25 cm/s. The current drag law has been tuned for a min fluid vel of 8 cm/s and uses 0.28 and 9.07 for these parameters. */ #include "udf.h" #include "sg_mphase.h" # define pi 4.*atan(1.) #define diam2 3.e-4 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; /* find the threads for the gas (primary) and solids (secondary phases). These phases appear in columns 2 and 1 in the Interphase panel respectively*/ thread_g = THREAD_SUB_THREAD(mix_thread, s_col);/*gas phase*/ thread_s = THREAD_SUB_THREAD(mix_thread, f_col);/* solid phase*/ /* find phase velocities and properties*/ 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 = 0.281632*pow(void_g, 1.28); else bfac = pow(void_g, 9.076960); 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; } Îҵĺ¯Êý·µ»ØÖµreturnÓ¦¸ÃÊÇÊ²Ã´ÄØ£¿ |
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