Hi Vaios Papatheodorou

Surge & Stall are phenomenon associated with air turbulence in atmosphere and found commonly on aircraft wings, wind turbine blades , compressors etc. In engineering, turbulence analysis often deals with behavior of the fluid flow, its separation or control processes at different fluid velocities that change the local pressure and influence the systems operation.

One of the most important dimensionless number that is researched in engineering is Reynolds number which plays a critical role in determining the nature of turbulent flows that lead to these phenomena.

Turbulence analysis is a very detailed and actively researched topic in various fields and cannot be described comprehensively.

Please refer to https://en.wikipedia.org/wiki/Turbulence for more concise information related to turbulence

Regards