Merge branch 'fix/velocity-output' into 'master'

Fix/velocity output

Closes #1161

See merge request !3134

(cherry picked from commit 2b68068f)

9d4dd3e5 [pmFlow] correct area in velocity
6c2c9fda [examples]add velocity in 1protationsymmetry
5 jobs for !3140 with cherry-pick-2b68068f
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