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Segregated solver diverge but coupled solver converge

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Old   October 20, 2021, 04:14
Question Segregated solver diverge but coupled solver converge
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Hi everyone,

It's my first post on this forum. I'm new to cfd and starccm+.

My problem is, I am simulating a flying engin which fly at Mach number M=0.16. When I want to run the simulation with the segregated solver I got an error around the 20th iterations which say " A non-finite residual was added by star.segregatedenergy.SegregatedEnergySolver. Typical causes are overflow, underflow or a division by zero."
I tried to refine/coarse the mesh, change the boundary layer or reduce the URF but nothing seems to make it better.

But when I run the simulation with the coupled solver I have no problem and the simulation run fine.
I have 5.6M cells and it's a fine mesh.

I have read that the coupled solver is a density based one and he is more used for compressible simulation where shock are observed but it is not my case here.

So if someone can help me
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cfd, coupled model, segregated model, solver convergence

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