I'm solving an eigenvalue problem in COMSOL. In the coefficient-form PDE interface, the coefficients of my partial differential equation contain eigenvalue terms (λ). However, if I enter "lambda" as the eigenvalue in the coefficient field as described in the COMSOL tutorial (https://doc.comsol.com/5.5/doc/com.comsol.help.comsol/comsol_ref_equationbased.23.011.html), the software will show it as an undefined variable. Then I can't solve the problem.
So, What is the expression for the eigenvalues in coefficient form PDE interface (eigenvalue study) in COMSOL? How can I enter the coefficients with eigenvalue terms (for example, as shown in the picture)? Thanks very much for your help.
1) use coefficient form PDE (c)
2) Study -> Step 1: Eigenvalue
You should be able to see in the equation form (show equation assuming Study 1, Eigenvalue) the equation containing lambda. There is absolutely no need to define a "lambda" as a variable or as a parameter.
Regards,
LC
Luigi Candido
But in the equation I am solving, the coefficients do contain eigenvalue terms (λ).
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