# Mesh influence in convergence

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 September 29, 2017, 11:44 Mesh influence in convergence #1 New Member   oswaldo borjas Join Date: Sep 2017 Posts: 1 Rep Power: 0 Hi there, Im a beginner in CFD simulations. For a final project, i am modeling a turbulent flow across a pipe (CS). In the middle of pipe, exist a heat flux I need to find the output values of temperature across the pipe. In the beginning, i started with a 3D model. Then in order to make simple the model, i change the 3D model to 2D model. The problem is when i apply a fine mesh (refining the most important study areas) the solution never converge, eventhough if i set to 10000 the iteration number). In the other hand, if i set a coarse mesh the solution converge (around 500 iterations) I dont know if the problems is because of Boundary conditions or the course of mesh BC The inner diameter of pipe is 58.8 mm Velocity inlet : 25.78 m/s Pressure outlet: 1 bar Heat Flux:4200 W/m2 I am using a K-Epsilon standard model and the fluid is AIR (ambient conditions). I reviewed all the input parameters to be sure if i am making a mistake but it seems everything Ok. The main questions is: Is the refine of mesh an important value for the model convergence? I think the most important values are the BC parameters Thanks in advance! Coarse mesh https://www.dropbox.com/s/oiwepa06z3...0mesh.jpg?dl=0 Fine mesh https://www.dropbox.com/s/i4ixtw6kny...203mm.jpg?dl=0 No convergence https://www.dropbox.com/s/agm9jxz0q5...encia.jpg?dl=0

 October 3, 2017, 10:13 #2 Member   power Join Date: Jun 2014 Posts: 86 Rep Power: 10 Did you check quality parameters of mesh?

 October 3, 2017, 10:26 #3 Senior Member   Filippo Maria Denaro Join Date: Jul 2010 Posts: 6,197 Rep Power: 66 That could also depend on the type of RANS model you are using

 Tags boundary conditions, convergence, mesh, pipe, refine

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