I am modelling layered burden in blast furnace for producing pig iron. I would like to know the effect of layer thickness in the heat transfer between ascending hot gas and descending alternating burden layers. According to User's and Theory Guide, I am using Eulerian Multiphase with k-epsilon tubulence model and enabled energy equation for the heat transfer calculation. I create the model as 2D axis-symmetry in steady state condition. After several trials like redefining the mesh, calculating all input values based on theory, I still find AMG solver divergence results mainly in mp x-momentum and pressure correction. When I change the pressure setting into selective and using CG stabilizer in AMG solver window, I will find AMG divergence in k calculation. All divergences happen in the first iteration.
Do I set the model wrong or is just the problem couldn't suit in Fluent? What should I do to get the convergent result? Thank you for reading this question and I am really looking forward to hearing your answers since I am literally confused what to do next.
Use this forum it can hep you. Good luck.
http://www.cfd-online.com/
I have similar problem on my project (modeling finned heat exchanger). At first I have divergence at begin of iterations (also k-epsilon model, RNG, enhanced wall treatment).
I make smaller elements in mesh, make 8 inflation's layers and now convergence is better but still very slow. Now I have problem with reversible flow on outlet.
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