Water management is an important product development aspect in various industries. In the automotive industry it needs to be considered in early development stage. Many components need to be protected from rain and splashing water. Tracking water (or other liquids) in complex enclosures for any kind of usage condition, such as inclined vehicle, cornering, braking and acceleration maneuvers, is critical. Extreme climate conditions like flooding and heavy rain require special attention. Furthermore there are potential problems with water leakage and drainage from locations where the water accumulates. Nowadays the aforementioned problems are most commonly solved using standard finite volume based Computational Fluid Dynamics (CFD) techniques, which commonly struggle for high complexity configurations in terms of efficiency. Present work describes a meshless Smoothed Particle Hydrodynamics (SPH) simulation approach to solve liquid dominated flows for configurations of highest complexity. The paper demonstrates the simulation methodology for rain and water wading conditions. Full complexity physical problems can be solved in a matter of hours, decreasing the turnaround times from weeks to less than a day, bringing great benefit in terms of virtual prototyping with minimum pre-processing effort. Virtual wetting sensors are used to extract current and total wetting in compartments of highest complexity. Moving parts such as rotating wheels and working windshield wipers can easily be considered. The applied simulation method can be used in automotive and aerospace industries as well as in many civil engineering applications related to flooding or heavy rain.