PINSFV convergence issue #30183
Unanswered
lucuo
asked this question in
Q&A Modules: Navier-Stokes
Replies: 1 comment
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Hello I recommend you set the preconditioning parameters only once in the Preconditioning block, and you should start with a direct solve to get a solution first. You can also explore using the SIMPLENonLinearAssembly executioner rather than the Newton solver Guillaume |
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Question
Dear MOOSE team, I'm using the porous media flow module in the NS module to simulate a 3D heat exchanger. I currently have two issues:
① When using the Darcy drag coefficient, it requires extremely large values to converge. I suspect small coefficients might cause turbulent flow instability, and though I've added the Mixlength turbulence model, what other methods can improve convergence?
② When using the Forchheimer drag coefficient, it not converge - what causes this? and What can I do to improve convergence
Attached are my input file,
mesh file,


Desktop.zip
mesh schematic."
Additional information
Mesh size and type:
Reynolds number: 1.9e3~3e5
Discretization (finite element CG/DG, finite volume, etc):finite volume
Models (turbulence, porous media, etc): porous media and mixinglength
Solver method (fully coupled, segregated, multiapps, etc): newton
Base input you started from:
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