Why nodes at boundary don't match?

The blue SAR are meshed by “SNGQ” (Mesh as single quad), while the yellow SAR are meshed by “AUTO”.
Neither of them turned on “XFLG”.
You can see that at common boundary, more nodes are generated in yellow SAR than those in blue SAR.

How to avoid this issue?

Hello

The program does what you have defined. As you said “the blue SARs are meshed by “SNGQ” (Mesh as single quad)”. So the element is meshed as one element and the yellow areas are meshed according to the automatic mesh generation algorithm with multiple elements. As you can see, you should choose the property wisely. So please use ‘auto’ for both structural areas or decrease the mesh size. Why do you want to use the option ‘SNGQ’? in the first place?

Best regards
Frederik Höller
Your SOFiSTiK Support Team

Why do you want to use the option ‘SNGQ’? in the first place?

I want to control the height of the blue SAR 1 mesh to be 1.3m in the height direction, so I can use “EXTR” in SofimshA to get volume mesh with 1.3m in height direction

+PROG SofimshA
HEAD
SYST REST
GRP 31
BRIC PROP MNO 12
EXTR TYPE FROM TO PATH V1 V2 V3 DIV
SAR SAR 1 DIR 0 0 5.2 4

5.2/4=1.3m

If I use Auto for SAR1, then the mesh of the SAR1 won’t match the volume mesh in the extrude direction.