Numerical Investigation of a High-Capacity Vertical Submersible Two-Stage Pump and Realization of an Experimental Test Bench for Determining the Strains and the Stresses on a Pump Shaft Topics: Domain-Specific Tools; Fluid Dynamics; Hydraulic and Pneumatic Systems; Non-Linear Systems; Verification and Validation In Proceedings of the 13th International Conference on Simulation and Modeling Methodologies, Technologies and Applications SIMULTECH - Volume 1, 393-400, 2023 , Rome, Italy