I am a German aerospace engineer in Berlin and worked 40 years for the German Aerospace Center and now for a small enterprise applying computational fluid Dynamics for Aerodynamics and Aeroacoustics. I consider myself an expert in fluid dynamics, aerodynamics, turbulence, acoustics, aeroacoustics, turbo-machinery and acoustic beamforming using phased arrays of microphones. I gave lectures on aeroacoustics at the Brandenburg Technical University of Cottbus, Brandenburg, Germany and on Turbomachinery Noise at the Technical University of Berlin.
In Wikipedia, I try to correct errors, whenever I run over them or make articles scientifically more correct. My edits in the English version of Wikipedia are rather rare, so far.