Different models have been proposed in the literature in order to simulate by Computational Fluid Dynamics (CFD) liquid films generated by spray impingement on vehicle surfaces. Generally, the discrete phase film model introduced by O'Rourke and Amsden (1996) and adapted by Kruse and Chen (2007) or the continuous phase film model as proposed by Anderson and Coughlan (2006) are applied when simulating vehicle soiling by CFD. Although several specific adaptations have been reported to increase model relevance and generality, it is still very difficult to capture all physical details of film flow dynamics, especially concerning the film break-up physics and the occurrence of splashing. The continuous phase film model approach of Anderson and Coughlan (2006), which is in the focus of the present paper, has been therefore improved with both objectives in mind. The modified model accounts for splashing of impacting droplets based on experimental results of Mundo, Sommerfeld and Tropea (1995), as well as for film break-up based on an adapted Weber number criterion. Test simulations have been performed on a simplified wind shield geometry. CFD predictions are compared with results from experimental investigations relying on Phase Doppler Anemometry (PDA) and Shadowgraphy measurements in a two-phase wind tunnel.
Improved Eulerian model for liquid films
2010
9 Seiten, 10 Bilder, 2 Tabellen, 15 Quellen
Conference paper
Storage medium
English
Eulerian Model Predicting the Behaviour of Liquid Sprays
British Library Conference Proceedings | 2002
|Eulerian model predicting the behavior of liquid sprays
Automotive engineering | 2002
|