I'm simulation maxing of jets problem in ANSYS (Fluent solver) for Mach 1.86 jets where jets are issuing from convergent-divergent nozzle into free atmosphere. The main highlights of simulation are
1. Density based solver (air is compressible): steady, axisymmetric
2. Ideal gas, Sutherland Viscosity
3. k-e realizable turbulence model
4. Solution method formulation : explicit
5. Default courant number = 5
6. Checked solution initialization for : Std., hybrid, fmg
But I'm getting Divergence in AMG solver with following error messege
# Divergence detected in AMG solver: Coupled -> Decreasing coarsening group size!
# Divergence detected in AMG solver: Coupled -> Increasing relaxation sweeps!
# You may try the enhanced divergence recovery with (rpsetvar 'amg/protective-enhanced? #t)
Divergence detected - temporarily reducing Courant number to 0.5
and trying again...
Divergence detected - temporarily reducing Courant number to 0.05
and trying again...
Divergence detected - temporarily reducing Courant number to 0.005
and trying again...
Divergence detected - temporarily reducing Courant number to 0.0005
and trying again...
Divergence detected - temporarily reducing Courant number to 5e-05
and trying again...
Internal error at line 1603 in file 'dbns\rp_mstage.c' on Node 0.
I've attached the image of CAD and Mesh File. Please help me.
sir, check mesh interface and make it coupled wall. it might help you
Dear Sanjeev Sir,
I think mesh doesn't have any interfacing but I've did face splitting for better mesh quality but don't know whether it causing divergence. And and I dono how to couple it. Could you please give me some material to do it.
Try out blocked mesh . u just need to do is go for ansys help there in mesh u can check how to mesh in the wright way . and to solve amg solver problem u can also ; first off the energy model then run 10-20 iterations then again continue it with on energy model. if this solved ur problem u shouldnot concern much with mesh. and also ucan go to solve-solution-controls and change the relaxation value and skweness of mesh. which might also solve ur problem.
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