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Lagrange multiplier in COMSOL 5.4

Posted 02.07.2020, 10:00 GMT-4 Fluid & Heat, Chemical Reaction Engineering, Electrochemistry Version 5.4 1 Reply

Imran Hossain
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Hello,

I want to use lagrange multiplier in my model , but I didn't get this variable in the transport of diluted species in COMSOL V5.4. That's why whenever I try to use this variable in later solving step in my model, it shows error.

Can anyone help me How I can solve this issue?

1 Reply Last Post 03.07.2020, 03:45 GMT-4
Alexis Prel
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Posted: 4 years ago 03.07.2020, 03:45 GMT-4

Hi Imran,

What have you tried so far?

Normally if you look up weak constraints in the COMSOL reference manual, it tells you how to compute fluxes using Lagrange multipliers. If the name of your variable is u, the Lagrange multiplier variable will be u_lm.

Hi Imran, What have you tried so far? Normally if you look up *weak constraints* in the COMSOL reference manual, it tells you how to compute fluxes using Lagrange multipliers. If the name of your variable is *u*, the Lagrange multiplier variable will be *u_lm*.

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