- #1

member 428835

I'm looking at a sessile drop of water in ambient air. The drop is plucked lightly, inducing surface oscillations. The fundamental frequencies ##\lambda_i## can be computed from spectral theory, and output complex values, say ##\lambda_1 = 2+7i##.

Now, I simulate the experiment via CFD and find that the numerical frequency is ##\lambda_{N1} = |2+7i| = \sqrt {53}##. Can anyone explain why the numerics output the magnitude of the fundamentals (eigenvalues)?