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I have problem of UDF with turbulent premx source. |
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February 16, 2005, 04:34 |
I have problem of UDF with turbulent premx source.
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Hi, I want to know if somebosy has used this UDF before. Since I have problems in activating this in my new simulation. The UDF is provided in www.fluentusers.com website.
/************************************************** *****************/ /* UDF that specifies a custom turbulent flame speed and source */ /* for the premixed combustion model */ /************************************************** *****************/ #include "udf.h" #include "sg_pdf.h" /* not included in udf.h so must include here */ DEFINE_TURB_PREMIX_SOURCE(turb_flame_src, c, t, turb_flame_speed, source) { real up = TRB_VEL_SCAL(c,t); real ut, ul, grad_c, rho_u, DV[ND_ND]; ul = Ul_par_premix(C_FMEAN(c,t)); rho_u = rho_par_premix(C_FMEAN(c,t)); 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; } Activating a Turbulent Premixed Source UDF in FLUENT Once you have compiled and linked the source code for a custom turbulent premixed source UDF, you can activate it in the User-Defined Function Hooks panel in FLUENT. See Section 8.2.5 for more details. |
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