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Buckling optimization

Im tyring to do a buckling free-sizing optimization - I have constraints of buckling and stress with an objective to minimize massfrac. I went throught the tutorial on free sizing (OS-4050), but I'm a little confused which modes are considered for the optimization. I have 1 buckling response (with mode number: 1). When I created the load collector, ND = 10. I also selected 'MAXBUCK' under opticontrol. The tutorial suggested this consideres the lowest 10 modes, is this correct?

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Altair Forum User

Hi davewalker348

MAXBUCK Controls maximum number of buckling eigenvalues to be considered for each buckling subcase in the optimization problem. If ND=15 is given in EIGRL, then only 10 buckling modes are considered for the optimization provided MAX_BUCK is set to 10.

Altair Forum User

Ok, so even if I have only one response, which has a 'buckling mode' entry, I consider the number of modes ND is set to (as long as its less than or equal to MAX_BUCK)?