instability due to meshing

[pics.munmun]

I meshed the floors and there was no incoherent edges generated. but while calculation, I realised that instability of type3 is generated at the node created by meshing. 

can that be ignored?

if not then how to solve it?

I tried deleting meshing and meshing the panel locally. But after doing so the instability warning came for another panel

[Stephane.kapetanovic]

hi @pics.munmun 

The instabilities can be generated by geometric irregularities not framed by the tolerances of the model.
For example in your case:

Junction of panels 1052 - 1057 (more than 2mm) node 3283

Panel 1062 have a small edge (6), 1077 edge (3), 1100 edge (3)

Beam 42 to 45 47 48  155 not perfectly X bar that may cause geometric analysis difficulties.

After checking the model if instabilities type 3 still exist you can ignore the message and check your results (large rotations, displacements, mesh nodes with concentration, etc.)

Best regards

[TienDat.NGUYEN.Engineer]

Dear @Stephane.kapetanovic ,

Could you please explain the core reason that we can normally ignore the type Instability Type 3 while we must pay attention/solve for Type 1 and 2 ?

Thanks in advanced.

[Stephane.kapetanovic]

HI @TienDat.NGUYEN.Engineer 

https://knowledge.autodesk.com/fr/support/robot-structural-analysis-professional/troubleshooting/caa...

Best regards