Bergische Universität Wuppertal - HD High Speed …...Bergische University of Wuppertal Fon: +49...

11. March 2010

A. Derichs, F. Hamacher, T. Motz, J. Müller, L. Hoppenheit

Dr. M. Oertel, Prof. Dr. A. Schlenkhoff

Hydraulic Engineering Section Civil Engineering Departement

Bergische University of Wuppertal GERMANY

HD High Speed Camera to investigate breaking waves

Breaking Waves 11. March 2010

Contents

• Introduction

• Lab / test set-up

• Test results / evaluation

• Summary

Contents

Introduction

The Laboratory

Test setup

HD High Speed Camera

Test run

PIV - Particle Image

Velocimetry

Summary


Introduction

The ambition:

• Generating a breaking wave in the wave flume

• Capturing the breaking wave with a highspeed camera

• Analysis of the intakes

• Visualisation of particle movement under the breaking wave (velocities and direction)

Contents

Introduction

The Laboratory

Test setup


Test run


Velocimetry

Summary


The Laboratory

• Wave channel

• 24 m length, 0.3 m width, 0.5 m heigth

• 0.3 m waterlevel

• wave generating paddle

• wave generation by own developed software

Contents

Introduction

The Laboratory

Test setup


Test run


Velocimetry

Summary


The Laboratory

Creating a breaking wave

• GUI wave flume

• superposition of particular waves

• forming a plunging breaker

Contents

Introduction

The Laboratory

Test setup


Test run


Velocimetry

Summary


Test setup

• High speed camera

• use of tracers

• similar density to water

• polyamide

• diameter < 1mm

• sheet of blackboard

• spotlights

Contents

Introduction

The Laboratory

Test setup


Test run


Velocimetry

Summary



Imaging Solution Motionscope M3

• Resolution 1280 x 1024

1,3 Megapixel

• Pixelsize 12 x 12 µm

• Recordingfrequency max: 1280 x 1024 @ 517 fps

1280 x 16 @ 33000 fps

used: 1280 x 512 @ 1000 fps

• Output: video (.avi, .mpeg, .mp4)

single picture ( .jpg, .tiff, .bmp, .png, …)

Contents

Introduction

The Laboratory

Test setup


Test run


Velocimetry

Summary


Test run

Contents

Introduction

The Laboratory

Test setup


Test run


Velocimetry

Summary


PIV - Particle Image Velocimetry - MatPIV (Sveen)

1) define a coordinate system (6 coordinates )

internal x- axis 0.3 m internal y- axis 0.2 m

2) blank out non relevant areas 3) start MatPIV analysis 4) filter & interpolate results 5) visualisation of results

Contents

Introduction

The Laboratory

Test setup


Test run


Velocimetry

Summary


PIV - Particle Image Velocimetry Source: LaVision

• method of velocity measurement

• tracers „mixed“ into water

• two frames

• measurement of distance during a certain time-increment

Contents

Introduction

The Laboratory

Test setup


Test run


Velocimetry

Summary

t

sv


Velocity Magnitude:

Contents

Introduction

The Laboratory

Test setup


Test run


Velocimetry

Summary


Velocity Vectors:

Contents

Introduction

The Laboratory

Test setup


Test run


Velocimetry

Summary


Streamlines:

Contents

Introduction

The Laboratory

Test setup


Test run


Velocimetry

Summary


Vorticity:

Contents

Introduction

The Laboratory

Test setup


Test run


Velocimetry

Summary


Thank you for your attention!

Hydraulic Engineering Section

Bergische University of Wuppertal

Fon: +49 202 439 4195

Fax: +49 202 439 4196

Summary

Contents

Introduction

The Laboratory

Test setup


Test run


Velocimetry

Summary

• generated a breaking wave • captured it with a high speed camera

• analysed intakes using MatPIV

• Visualisation of particle movement

Bergische Universität Wuppertal - HD High Speed …...Bergische University of Wuppertal Fon: +49...

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