Unwanted merging of nodes 1

[WorcesterSorcerer]

When I mesh multiple surfaces at the same time, FEMAP automatically merges nodes that are close as shown in the image, which i do not want. If I mesh them individually, there is no problem and the surfaces mesh as expected. Does anyone have an explanation for this? Is there a setting/button I need to uncheck.

 

[SWComposites]

I vaguely recall there is a parameter setting that defines the distance over which nodes are merged.

 

[WorcesterSorcerer]

@SWComposites Thanks - i'm not actively merging the nodes (i.e. checking coincident elements) . FEMAP is doing it of its own accord....

 

[SWComposites]

Yes, I know that. There should be a setting to control the auto merging. I don't have a copy of FEMAP anymore so can't check it directly.

putting "femap auto merging nodes distance" into google comes up with a bunch of info.

 

[WorcesterSorcerer]

Ah ! Thank you @SWComposites - you are a legend.

My model has tiny parts that are 50m apart - I just googled what you suggested and the penny dropped!:

"Femap determines the default node merge tolerance based on overall model size. The number is 1/10000 of the model box diagonal (think of the model box being an invisible box that completely encapsulates every entity in the model)."

Thank you thank you - you've saved me a lot of graft lol