Analysis of unsteady fluid flow inside fluid power components – a challenge to CFD-simulation

Abstract

Hydraulic and pneumatic valves and hydrostatic pumps are key-components of fluid power drive and control systems. Due to their inherent transient operating conditions and the moving devices included they are posing challenges for numerical simulation. Unsteady fluid flow, moving and deforming flow domain and strong nonlinearities caused by physical phenomenon like aeration and cavitation in hydraulics and shock waves in pneumatics are some of them. Another aspect of increasing importance in design of fluid power components is the need of reduced pulsation and noise emission...