I have a heat transfer optimization problem. My heat transfer area is governed by a quadratic equation in two variables as follows which is to be supplied as a constraint:

-26.143+4.3229*l2^2+l1^2+4*l1*l2=0

where l1 and l2 are geometric parameters

My problem is that I don't know how to write equality constraints in COMSOL 5.2. Any suggestions would be appreciated.

Best,

Mahvash

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