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Unusual Jump in Scaled Residual

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Old   March 25, 2019, 10:32
Default Unusual Jump in Scaled Residual
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Jay Vora
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Hi,
I am currently doing a 3D simulation for an aircraft.
model- k-w sst
steady-state pressure based solution
Mesh Quality:

Minimum Orthogonal Quality = 1.17479e-04 cell 796080 on zone 2 (ID: 1405101 on partition: 1) at location (-1.39139e+01 2.22699e+00 8.14461e+01)

Boundary conditions
velocity inlet
pressure outlet

Solution method
Coupled and second order for the rest.

During the solution phase, I get huge spikes in the calculation for both lift and drag force.
also, a message is posted " Stabilizing pressure coupled to enhance linear solver robustness." - don't know what it means.

I have attached images.
Any help would be appreciated.
Attached Images
File Type: jpg Mesh1.jpg (198.8 KB, 22 views)
File Type: jpg Lift Force.jpg (68.3 KB, 27 views)
File Type: jpg Residuals.jpg (152.7 KB, 28 views)
File Type: jpg Mesh2.jpg (195.0 KB, 21 views)
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Tags
pressure boundary, spikes


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