Physical testing of a vehicle wading through water is performed to gauge the capability of a vehicle to traverse through shallow to deep levels of water; wherein various vehicle performance parameters are observed, recorded and analysed. Jaguar Land Rover (JLR) has instigated and established a comprehensive CAE test procedure for the assessing the same, which makes use of overset mesh (in a CFD environment) for a non-traditional approach to vehicle motion. An extended simulation methodology, making use of the passive scalar model has been established to understand water impingement and splashing in a greater detail, which are the two critical performance parameters during vehicle wading. A passive scalar acts as a pseudo catalyst in the target fluid phase of the multiphase CFD simulation. Analysis carried out using this model gives the amount of water ingress from specific locations on the vehicle and also the amount of water subsequently splashing on the pre-set target locations or components in the engine bay. The assessment was performed on a simplified and scaled down vehicle model, so as to allow reiterative simulation setup with minimal computational cost. The methodology was later, implemented on a full scale JLR vehicle successfully. Investigations have been made into the standard wading physics, so as to inherently optimize the splashing and water jet simulations. Large Scale Interface model was implemented instead of default VOF-VOF fluid phase interaction model, and a comparison is made between the two. Wheel rotation approach implemented was scrutinized as well and appropriate inferences are drawn.