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September 29, 2017, 11:44 |
Mesh influence in convergence
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#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 |
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October 3, 2017, 10:13 |
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#2 |
Member
power
Join Date: Jun 2014
Posts: 86
Rep Power: 12 |
Did you check quality parameters of mesh?
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October 3, 2017, 10:26 |
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#3 |
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,882
Rep Power: 73 |
That could also depend on the type of RANS model you are using
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Tags |
boundary conditions, convergence, mesh, pipe, refine |
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