tire water splash - thermohani/ofgbg12/slides/dragosmoroianu.pdf · 2012. 11. 28. · tire water...

Global Marketing, Richard Monturo, RMONTURO, Issue Date: 26 June 2011

Page 1

Tire Water Splash

Dragos Moroianu

Volvo Car Corporation

Andreas Blixt

FS Dynamics

Global Marketing, Richard Monturo, RMONTURO, Issue Date: 26 June 2011

Page 2

Overview

Background

Current Approach

New Approach

Model description

Results

Conclusion

Global Marketing, Richard Monturo, RMONTURO, Issue Date: 26 June 2011

Page 3

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 4

Background

What is splash?

Why is splash a problem?

Current splash CAE method description

4 Thursday, November 15, 2012

Global Marketing, Richard Monturo, RMONTURO, Issue Date: 26 June 2011

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Speed between 30-65km/h

Water depth 20-80mm

Higher depth... Wading

Even higher depth ... submarine

What is splash

5 Thursday, November 15, 2012

Global Marketing, Richard Monturo, RMONTURO, Issue Date: 26 June 2011

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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

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Numerical (LPT) - hard to estimate

trajectory after wall interaction

Background – Current approach

Experiments provide qualitative

information

Global Marketing, Richard Monturo, RMONTURO, Issue Date: 26 June 2011

Page 8

• 2 way coupling - transient

• Continuum for both phases

• Surface tracking

Side Splashing

a

w

New Approach

Forward Splashing

b

w

Global Marketing, Richard Monturo, RMONTURO, Issue Date: 26 June 2011

Page 9

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

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Model Description

D

4D

3D

50

mm

symmetry

Pressure outlet

wwheel = 25 rad/s

Global Marketing, Richard Monturo, RMONTURO, Issue Date: 26 June 2011

Page 11

Results

monitoring point

Global Marketing, Richard Monturo, RMONTURO, Issue Date: 26 June 2011

Page 12

Splash – front view

Results

Global Marketing, Richard Monturo, RMONTURO, Issue Date: 26 June 2011

Page 13

Splash – top view

Results

Global Marketing, Richard Monturo, RMONTURO, Issue Date: 26 June 2011

Page 14

Splash – side view

Results

Global Marketing, Richard Monturo, RMONTURO, Issue Date: 26 June 2011

Page 15

Splash - view from underneath

Results

Global Marketing, Richard Monturo, RMONTURO, Issue Date: 26 June 2011

Page 16

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 17

Questions?