INTRODUCTION

Aerodynamics is a key vehicle functionality to achieve the industry goals regarding emissions and vehicle efficiency. Aerodynamics rivals weight as energy consumer at low speed cycles (WLTP) and is the main energy consumer at highway cycles, thus the Cd targets are lowered year by year. To achieve best in class aerodynamic values (Cd & Cl), IDIADA provides deep knowledge of the contribution of all vehicle parts to the aerodynamic forces and an experienced CFD and wind tunnel testing team.

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DESCRIPTION

CFD Simulation:

The IDIADA CFD team has more than 25 years of experience in simulating various automotive fluid dynamics problems: aerodynamics, thermal & cooling, multi-phase, aero-acoustics, etc. We have in-house hardware premises and in order to be aligned with our customers, we are skilled in the most used software packages: STAR-CCM+, ANSYS, OpenFOAM, PowerFLOW, etc.

 

Road testing:

Aerodynamics testing in real driving conditions include steady and transient events.

Measurements on test track:

  • Coast down
  • Air drag as per VECTO
  • Cross wind

Measurements on open road:

  • Steady flow driving scenarios
  • Transient driving scenarios: Gusts and Driving maneuvers

 

Wind tunnel testing:

IDIADA provides turn-key wind tunnel testing support in many different commercial wind-tunnels worldwide. The IDIADA support includes: mock-up definition and construction, test scheduling and on-site support at the testing sessions.

 

Reduced  scale wind tunnel testing:

50% mock-up testing is a very attractive option at the initial stages of a project. IDIADA utilizes a former F1 wind tunnel facility to provide quick aerodynamic assessment at the concept phase. IDIADA designs and manufactures 50% mock-ups with sting fixation and single belt wheel rotation systems. Wind tunnel specifications:

General specifications:

  • Single return closed circuit
  • 46m long x 15m wide x 7m high
  • Speed nominal range from 30m/s to 50m/s

Test section:

  • Area 7.5m2
  • Dimensions: 2.23m x 3.35m x 8m
  • 27% slotted wall
  • Suitable for 50% - 60% automotive models

Moving ground:

  • Dimensions: 2m wide x 5.4m long
  • Upstream boundary layer suction
  • Boundary layer displacement thickness at model nose: 0.3mm

 

The Cronuz Project:

Get more information regarding the Cronuz Project presented at the Geneva Motor Show 2018 at our news section.

 

Research Activities:

In order to provide optimal solutions for airflow modelling, IDIADA develops proprietary software based on Vortex methods and Artificial Intelligence. Two differentiate strategies for high fidelity turbulence modelling are developed by IDIADA:

  • VORCAT: IDIADA co-develops together with VORCAT Inc. a CFD tool based in vortex methods that overcomes the main drawbacks of RANS & LES turbulence models and provides unprecedented flow accuracy. VORCAT simulates incompressible, turbulent flow in three-dimensions by a time-accurate and physically consistent numerical methodology.
  • Artificial intelligence: IDIADA participates in the EU funded UPSCALE project that aims to develop Artificial Intelligence enhanced CAE tools. One of the IDIADA objectives in the UPSCALE project is developing a Physics Informed Machine Learning model for correcting RANS modeled Reynolds Stress Anisotropy, this trained algorithm aims at enhancing the accuracy of the an-isotropic component of Reynolds Stress tensor (R) modeled by Reynolds Averaged Navier Stokes (RANS) based turbulence models using machine learning techniques, these modified RANS turbulence models will provide the accuracy of LES modelling while keeping the efficiency of steady state RANS simulations.