Tire Water Splash Dragos Moroianu Andreas Blixt Volvo Car - PowerPoint PPT Presentation

Tire Water Splash Dragos Moroianu Andreas Blixt Volvo Car Corporation FS Dynamics Global Marketing, Richard Monturo, RMONTURO, Issue Date: 26 June 2011 Page 1

Overview Background Current Approach New Approach Model description Results Conclusion Global Marketing, Richard Monturo, RMONTURO, Issue Date: 26 June 2011 Page 2

About us Volvo Car Corporation – Fluid Dynamics Center • 18 employees • support 5 attributes • start 1990 FS Dynamics • 150 employees • start 2004 (4 persons) • consultance in engineering applications with solutions based on CFD/FEM Global Marketing, Richard Monturo, RMONTURO, Issue Date: 26 June 2011 Page 3

Background What is splash? Why is splash a problem? Current splash CAE method description Global Marketing, Richard Monturo, RMONTURO, Issue Date: 26 June 2011 4 Thursday, November 15, 2012 Page 4

What is splash Speed between 30-65km/h Water depth 20-80mm Higher depth... Wading Even higher depth ... submarine Global Marketing, Richard Monturo, RMONTURO, Issue Date: 26 June 2011 5 Thursday, November 15, 2012 Page 5

What is really the problem with splash? • Engine bay water contamination • High water loads on critical components Global Marketing, Richard Monturo, RMONTURO, Issue Date: 26 June 2011 Page 6

Background – Current approach Experiments provide qualitative Numerical (LPT) - hard to estimate information Global Marketing, Richard Monturo, RMONTURO, Issue Date: 26 June 2011 trajectory after wall interaction Page 7

New Approach • 2 way coupling - transient • Continuum for both phases • Surface tracking w w b a Global Marketing, Richard Monturo, RMONTURO, Issue Date: 26 June 2011 Forward Splashing Side Splashing Page 8

Model Description • Incompressible flow • Multiphase (liquid/gas) - VOF • URANS (k-e, SST, Spalart-Almaras) • Large Eddy Simulation (Smagorinsky subgridscale model) • Polyhedral mesh Global Marketing, Richard Monturo, RMONTURO, Issue Date: 26 June 2011 Page 9

Model Description Pressure outlet 3D D w wheel = 25 rad/s symmetry mm 50 4D Global Marketing, Richard Monturo, RMONTURO, Issue Date: 26 June 2011 Page 10

Results monitoring point Global Marketing, Richard Monturo, RMONTURO, Issue Date: 26 June 2011 Page 11

Results Splash – front view Global Marketing, Richard Monturo, RMONTURO, Issue Date: 26 June 2011 Page 12

Results Splash – top view Global Marketing, Richard Monturo, RMONTURO, Issue Date: 26 June 2011 Page 13

Results Splash – side view Global Marketing, Richard Monturo, RMONTURO, Issue Date: 26 June 2011 Page 14

Results Splash - view from underneath Global Marketing, Richard Monturo, RMONTURO, Issue Date: 26 June 2011 Page 15

Conclusion - Method to predict the tire water splash - Important parameters: amount, direction, and load - Good frequency agreement with experiments - Good qualitative agreement with experiments - More work is needed for a robust procedure Global Marketing, Richard Monturo, RMONTURO, Issue Date: 26 June 2011 Page 16

Questions? Global Marketing, Richard Monturo, RMONTURO, Issue Date: 26 June 2011 Page 17