CFD Modeling of Pressure Variation in a Road Cavity with Volume Variation
* Presenting author
This paper deals with the variation of air volume at the contact interface between a rolling tyre and a roadsurface leading to aerodynamic phenomena such as air-pumping. A numerical model was developed (in 2Dand 3D) based on Computational Fluid Dynamics, using the Fluent solver, coupled with a displacementfunction of the bottom of the cavity representing its volume variation. Results showed that the maximumpressure reached at the bottom of the cavity during its complete closure increased as its volume decreased.The pressure variation was related to the volume variation by a relationship close to Laplace law for perfectgases. In addition, pressure oscillations after the opening of the cavity increased in amplitude and frequencyas its volume decreased. Moreover, in the case of INRETS (1990) experimental setup, introducing the volumevariation estimated by Laplace Law in the 3D model has shown better agreement between the calculatedpressure and the measured pressure in comparison with the model neglecting this volume variation. Futurework would therefore be to obtain the actual volume variation caused by the penetration of the tyre treadinside the cavity. This could be done either experimentally or numerically using a tyre/road contact model.