# continuity diverging problem

 Register Blogs Members List Search Today's Posts Mark Forums Read

 October 31, 2009, 09:28 continuity diverging problem #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,,, presidentmamun likes this.

 Tags carreau, diverge, non-newtonian, udf, viscosity

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post skabilan OpenFOAM Running, Solving & CFD 12 September 17, 2007 17:48 Cdx FLUENT 0 March 13, 2007 06:15 dario FLUENT 1 October 1, 2006 07:23 liugx212 OpenFOAM Running, Solving & CFD 3 January 4, 2006 19:07 Jack Main CFD Forum 0 December 15, 2002 01:15

All times are GMT -4. The time now is 02:31.