porous media turbulent model P-dL, I get the different results? is the model wrong?

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 July 13, 2014, 05:57 porous media turbulent model P-dL, I get the different results? is the model wrong? #1 New Member   xue chen Join Date: Apr 2014 Posts: 7 Rep Power: 4 I use ANSYS Fluent to do some work on the turbulent flow in porous media with macroscopic model. I use UDF to add the additional source caused by porous media with p-dL model. Now I would like to validate my work using the flowing papers. Marcelo J.S. de Lemos.Turbulent kinetic energy in a moving porous bed” in International Communications in Heat and Mass Transfer 35 (2008) 1049–1052 Marcos H. J. Pedras, Marcelo J. S. de Lemos. On the Mathematical Description and Simulation of Turbulent Flow in a Porous Medium Formed by an Array of Elliptic Rods.Journal of Fluids Engineering 2001 Renato A. Silva, Marcelo J.S. de Lemos. Turbulentflow in a composite channel.International Communications in Heat and Mass Transfer 38 (2011) 1019–1023. etc.... I did not get the same resluts. I use physical velocity for all the simulations, and my UDF the additional terms with P-dL model are attached. please help me out, I have been doing the verification for two months, and found nothing to solve my problem. /************************************************** *********************/ /* P-dL(，2001) */ DEFINE_SOURCE(kpa_PdL,c,t,dS,eqn) { real source,ck,um; real fai,dp,k,con; ck=0.28; Properties(c, t, &fai, &dp, &k, &con); um=sqrt( C_U(c,t)*C_U(c,t)+C_V(c,t)*C_V(c,t) ); source =fai* ck*C_R(c,t)*C_K(c,t)*fai*um/sqrt(k); dS[eqn]=fai* ck*C_R(c,t)*fai*um/sqrt(k); return source; } DEFINE_SOURCE(ybsl_PdL,c,t,dS,eqn) { real source,ck,c2,um; real fai,dp,k,con; ck=0.28; c2=1.92; Properties(c, t, &fai, &dp, &k, &con); um=sqrt( C_U(c,t)*C_U(c,t)+C_V(c,t)*C_V(c,t) ); source =fai* ck*c2*C_R(c,t)*C_D(c,t)*fai*um/sqrt(k); dS[eqn]=fai* ck*c2*C_R(c,t)*fai*um/sqrt(k); return source; }

 Tags porous media, turbulent model p-dl

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