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WIP: Enable BetaZero setting to be used with SingleMode Fourier expansion

Stanislaw Gepner requested to merge feature/BetaZero_Override into master

After more testing, I think this does not work.

Stability analysis with 1D homogeneous expansion allows for the beta parameter to be overridden to zero with

<I PROPERTY="BetaZero"          VALUE="False"               />

resulting in a 2D solution. This setting is only used if the Coupled solver is used, it is ignored with the VelocityCorrectionScheme.

This change enables BetaZero to be used with VelocityCorrectionScheme. I have tested it with the TransientGrowth, looking for the 2D (dominant) initial disturbance in a channel flow. The result seems consistent with my expectations.

Edited by Stanislaw Gepner

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