Discussion Forum

Hi Berry,

Expand the Results node, right click on "Derived Values". Choose "Maximum", and then select "Surface Maximum". That will allow you to select specific boundaries.

Under Results->right click Derived Values->Mouse over Maximum->Click Surface Maximum

Best,
David Hovsepian
COMSOL, Inc.
781-273-3322

Please see attached screenshot

Can I select half a surface? Or, how may I split a surface into two, an inside and outside, and then select the inside? (see alpha.jpg - of the selected surface, I want to select the innermost ring only)

For example, to display only a part of the geometry being evaluated, we can use a 'filter'. Can I do something similar for the surface maximum evaluation?

Hi

you might get around with a Boolean expression of the type

maxop1((x>0)*(y>0)*Max_variable*(x<1)*(y<2))

if Max_variable is always >0 but you need to tweak the constants and the rest to adapt to your case

Note though these Bolean maxop are very demanding on the processing and can take quite some time, it's always faster to partition the boundaries and select entire boundaries entities

--
Good luck
Ivar

For essentially the same reasons discussed here www.comsol.com/community/forums/general/thread/90392 we would not recommend using boolean operators for this. Partitioning at the geometry level is a better idea for accuracy.
Jeff

Thank you, David and Ivar. I proceeded with the masking suggested by Ivar after exporting the data - seemed quickest.
Thanks Jeff, for the note of caution.