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October 31, 2009, 09:28 |
continuity diverging problem
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#1 |
New Member
Mijin Kim
Join Date: Sep 2009
Posts: 2
Rep Power: 0 |
Hi, guys
I am solving non-newtonian blood flow with carreau model. Because I couldn't understand what the "Activation Energy" in ""property panel >> viscousity >> carreau "" I made my UDF code for carreau model , which is below #define mu_inf 0.00345 #define rho 1050 #define mu0 0.056 #define n 0.3568 #define K 3.133 DEFINE_PROPERTY(carreau_viscosity,c,t){ real mu_carr, gamma; real n1 =(n-1)/2; gamma = C_STRAIN_RATE_MAG(c,t); mu_carr = mu_inf +(mu0 - mu_inf)*pow((1+pow(K,2)*pow(gamma,2)), n1 ); return mu_carr; } First, I solved the case with constant viscosity, mu_inf=0.003465 and then, only changed fluid viscosity by udf carreau model and reiterated the case. Here, I got some problems. all of the residuals , espcially the continuity, diverge. I cannot notice what the problem is, And i need ur help!! Is there anyone who can let me know How can i get the right solution? Please help me,,, |
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Tags |
carreau, diverge, non-newtonian, udf, viscosity |
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