problem convergence heat exchanger

[house831]

Hello, everyone. .
I am simulating for my thesis, a heat exchanger water exhaust gas, but despite having made millions of mesh, the calculation does not go to convergence, so I am sure of the doubts, on the fact of wrong avr to use the model of turbulence, or however to wrong the settings for the calculation of the solution.


thank you in advance.....for advice

 

[paolina]

according to what criterion do you say that does not come to convergence? ... I better explain if you wait for fluent to automatically stop iterations with message "solution is converged" then you have to tell us how you set the residues, then if you see that the solution grows without any oscillation ... then the problem is not mesh!