Fix missing phase angle in calculation of grid velocity for rigid pitching motion

[HL-ZHI]

Proposed Changes

For RIGID_PITCHING movement, add PHASE parameter to angular velocities.

Pitching angle: angle=Ampl * sin(Omega * Time + Phase)
Original augular velocity: AlphaDot = Omega * Ampl * cos(Omega *Time)
Updated angular velocity: AlphaDot = Omega * Ampl * cos(Omega *Time + Phase)

PR Checklist

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[pcarruscag]

Thanks for the fix 👍

[pcarruscag]

I forgot, please add yourself (either name or GitHub handle) to the AUTHORS.md file (alphabetical order).

[HL-ZHI]

I forgot, please add yourself (either name or GitHub handle) to the AUTHORS.md file (alphabetical order).

Done. #1657