b'Automotive | Engineer InnovationSimcenter SimcenterSTAR-CCM+ FluxHX h conv,wall Star-CCM+on HPC T int,HX (x,y) Simcenter Amesim dmair,internalon HPCT extV vehVVeh> 2,5m/s HVAC blowerFan on/off position3D external T air,HX (x,y) 1D vehicle simulation drive cycle T wall 3D cabinow & V atr,HX (x,y) dm air ventunderhood dm recir Figure 2: Coupling strategy between Simcenter Amesim 1D & Simcenter STAR-CCM+ for FIAT 500edecades, especially in electronic,create a digital reproduction of the combustion or hydraulic systems. Suchoverall vehicle systems. It includes an approach is relevant for componentfunctional models of:design to enhance local behavior which cannot be properly modelled in 1D. The electric powertrain (battery, Compared to existing methods, thisinverter and electric motors),new approach uses smart coupling A 1D cabin model and between Simcenter Amesim andcomplementary 3D cabin model Simcenter STAR-CCM+ to integrate the(thermal walls are considered as well use of high fidelity models for highas average air volume temperature), performance computing (HPC) smartandcoupling. It is possible to connect A thermal management model several 3D models with a single one 1Dcomposed of battery cooling circuit, model used as a variable boundarypowertrain cooling circuit and AC condition supplier along a transientsystem.scenario by using the smarter coupling strategy. All parameters have been set according to existing data from the available FIAT Using the right models 500e vehicle. 1D system simulation modeling is used to simulate components andEven if a 1D model can connect all these subsystems of the electric vehiclesubsystems of the vehicle, it cannot (battery, inverter, electric motor, coolingeffectively account for some physical system, HVAC and others), replicatingphenomena. This is the case of airflow how they work and which inputs andand all its derivatives, where outputs are required or provided. Theycalculations need complex and are mutually linked to simulate theexpensive models. The only way to behavior of a whole vehicle in realobtain a high-fidelity simulation is to driving conditions. Focusing on theuse 3D models, in particular thermal management, such numericalcomputational fluid dynamics (CFD). simulations can provide informationFor this methodology, airflow is about the temperatures of eachcalculated in two different domains, component and therefore the influencewhich makes two 3D models: one of the air-conditioning (AC) system onvehicle model for the simulation of the vehicle range, through the electricexternal flow around vehicle and under consumption of the compressor.the hood, and one cabin model for the Simcenter Amesim provides all thesimulation of internal flow for required libraries and tools to rapidlypassenger comfort. 37'