Spectrum files

FELiCS exports spectral solution information using .csv files.

These files are produced only for:

• "Modal" analyses,

• "Resolvent" analyses,

chosen with Case.AnalysisMode.

Modal spectrum

Modal analyses export the eigenvalue spectrum to:

spectrum.csv

Typical columns include:

Column	Description
omega_direct_r	Real part of the direct eigenvalue
omega_direct_i	Imaginary part of the direct eigenvalue
omega_adjoint_r	Real part of the adjoint eigenvalue
omega_adjoint_i	Imaginary part of the adjoint eigenvalue

Adjoint columns are only present when Case.CalculateAdjoint is enabled.

Example

omega_direct_r,omega_direct_i,omega_adjoint_r,omega_adjoint_i
0.727343,0.001271,0.727343,-0.001271

Resolvent spectrum

Resolvent analyses export the computed gains to:

gains.csv

Typical columns include:

Column	Description
omega	Angular frequency
gain_0	Leading resolvent gain
gain_1	Second resolvent gain
…	Additional subleading gains

Example

omega,gain_0,gain_1
0.7,1.100880e+07,5057.819664
0.8,1.394340e+07,2557.409904