Delayed Detached Eddy Simulation of the exhaust system of a LMP2 car

Talking about race cars' aerodynamics, effects that the exhaust system has on the latter can not be ignored. In the past years, engineers take advantage of these high-energy flows which have turned to be the key point in many car competitions. The purpose of this thesis is to identify a methodology for the fluid dynamic simulation of the exhaust gases, in cross-flow configuration, aimed to predict the effect on the car's aerodynamic load through the application of Delayed Detached Eddy Simulations (DDES). Furthermore, it wants to evaluate the differences, in terms of loads and fluid structures, between this model and the Reynolds-averaged Navier–Stokes Eddy Viscosity Model (RANS-EVM). The car considered for the study is the Dallara P217 built by Dallara to compete in the 2017 World Endurance Championship (WEC). The basic hypothesis in DDES modelling is the linearization of the vehicle-exhaust system. The flows inside the exhaust pipes (Sub-Model Simulation) and the external flows outside the car (Full-Model Simulation) were therefore independently simulated. The Full-Model simulation models the exhaust flows through the use of a velocity inlet condition; the data necessary for the definition of this boundary condition are the results coming from the Sub-Model simulation.