The significance of coherent flow structures for the turbulent mixing ...

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6 Investigation of the xz-plane the negative sign of the correlation, indicated by the dashed lines, that the ejection and sweeps must be the predominant processes and the different size, shape and intensity of the functions Ë ê0- 9 ; á ìÌí Ñ ê0- 9 ;?> ìÌí ½¤Ã Ñ ê.- 9 ; á ìÌí Ë ê.- 9 ;?> ìÌí ) imply the dominance of ejection at this wall locations. (Ã In addition it can be estimated from the location of the maximum in the upper left graph that the low momentum region appears as a shear layer in -direction while the strong positive side peaks in the same figure indicate that the outflow of low-momentum fluid is associated with a secondary motion. The centre row of figure 6.14 reveals the same functions but measured at ¿A¨ À and ® ¿ «¢À e.g. Ã Ë ê.-:9&;)B ìÌí Ñ ê.-:9
6.3 Spatio-temporal buffer layer statistics R + + R + + u(y =20) w(y =10) u(y =30) w(y =20) ∆ z + ∆ z + R + + R + + -u(y =20) w(y =10) +u(y =20) w(y =10) ∆x + ∆x + FIGURE 6.15: Top: Ð Ñ ê0-:9 ìÌí (left) and Ð Ñ ê0-:9&;)B ìÌíD ê0-=9 ìÌí (left) and Ð Ë ê0- 9 ;)B ìÌíE ê.- 9 ; á ìÌí (right). Bottom: Ð Ë ê0-=9
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The significance of coherent flow s
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Contents 1 Introduction 5 2 Particl
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1 Introduction One of the fascinati
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As order can be always observed whe
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were not considered in detail in th
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varying signal can be transformed i
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2 Particle Image Velocimetry The tr
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2.1 Principles It is of fundamental
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’ ’“ ” ”• Ž Ž Ž Ž
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¹ and 2.2 Generation of appropriat
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2.2 Generation of appropriate trace
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2.3 Registration of the particle im
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2.3 Registration of the particle im
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ë ë 2.3 Registration of the parti
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ýÿþ¡ û û ¢ ¢ £ôþ¡ î¥
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or = ö D Q ù ù ?xö ù Y[Z]\ & &
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ñ † † † † † † † †
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˜ E ˜ T ˜ T 2.4 Particle image
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3 Stereo-scopic Particle Image Velo
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› B › B › J ù ž & 3.1 Princ
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Æ e¼c’„ïG ù # #dc’e › B
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Ð È Ñ ù Ñ ù Ð È Ð È Ñ ù
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3.2 Evaluation of stereo-scopic ima
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ú ¦ 3.3 Calibration validation by
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4 Multiplane Stereo Particle Image
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£ è ¤ ó 4.2 Four-pulse-laser S
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£ ¤ £ £ 4.2 Four-pulse-laser Sy
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( ì ( æ ( ì è ð ( ( ( ( ( ( ì
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æ ( | | | | | | | ì æ õ æ õ
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4.5 Simplified recording system 4.5
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4.7 Monochromatic aberrations refle
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º¹ n 4.7 Monochromatic aberration
Page 65 and 66: 4.8 Feasibility study experiments i
Page 67 and 68: 4.8 Feasibility study 10 20 30 40 5
Page 69 and 70: é¥î ëÝïñð€òôó 5 Invest
Page 71 and 72: I L § § § : ? ; õ : I I I W
Page 73 and 74: 5.2 Experimental set-up α4 α3 α2
Page 75 and 76: { : { L Ø { 9 D { 9 D T W ð 9
Page 77 and 78: : T ž ž ò 5.3 Statistical pro
Page 79 and 80: ¾ ¾ 5.3.2 Spatial auto- and cross
Page 81 and 82: ½ Ë 5.3 Statistical properties of
Page 83 and 84: ½ Ë 5.3 Statistical properties of
Page 85 and 86: ô ó ñ ½ ñ ô ó 5.3 Statistica
Page 87 and 88: æ å ä ã ã ã ½ Ë ä æ å ½
Page 89 and 90: æ æ å ä À Â ½ 5.3 Statistica
Page 91 and 92: ½ 5.4 Properties of coherent veloc
Page 93 and 94: » % %QÄ ¾ Ó turbulent velocit
Page 95 and 96: * Ó , Ó * Á , Â 5.4 Properties
Page 97 and 98: ! 6 Investigation of the xz-plane O
Page 99 and 100: 6.1 Experimental set-up the (virtua
Page 101 and 102: ß ß 6.2 Statistical properties
Page 103 and 104: g ˆ g ˆ 6.2 Statistical propertie
Page 105 and 106: — ¯ 6.2 Statistical properties o
Page 107 and 108: å å ç æ æ ã ã ã å å è æ
Page 109 and 110: 6.2.3 Spatial cross-correlation fun
Page 111 and 112: 6.2 Statistical properties of the b
Page 113 and 114: 6.2 Statistical properties of the b
Page 115: performed at and the second at
Page 119 and 120: M M æ æ æ æ æ æ ã ã ã H M
Page 121 and 122: V W V 6.4 Properties of coherent ve
Page 123 and 124: 6.4 Properties of coherent velocity
Page 133 and 134: d d 6.4 Properties of coherent velo
Page 135 and 136: '§ 'Î ª ¿ ¦ '§ ')( 7 Investi
Page 137 and 138: % { s s s s 7.1 Experimental set-up
Page 139 and 140: ‘ — s 7.2 Statistical propertie
Page 141 and 142: 7.2 Statistical properties of the l
Page 143 and 144: ¿ 7.2.2 Spatial cross-correlations
Page 145 and 146: ¿ 7.2 Statistical properties of th
Page 147 and 148: ô ô 7.3 Spatio-temporal correlati
Page 149 and 150: 7.3 Spatio-temporal correlations wi
Page 151 and 152: ¨ ¨ ¨ 7.3 Spati
Page 153 and 154: £ 7.4 Spatio-temporal correlations
Page 161 and 162: ¿ 7.5 Properties of coherent veloc
Page 163 and 164: ¿ 8 Summary The first part of this
Page 165 and 166: aperture, it is shown how to elimin
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¡ ¿ tures keep their spatial orga
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Bibliography [1] ACARLAR MS, SMITH
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[30] HINSCH K (1995) Three-dimensio
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[60] KNEUBÜHL FK, SIGRIST MW (1995
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[93] SMITH CR, METZLER SP (1983) Th
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Z k l l l l l { l R q ‡ ˆ ’
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Ø á a Õ Œ v momentum thickness,
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Index Kolmogorov micro-scale . . .
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Acknowledgement First of all I woul
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Lebenslauf von Christian Joachim K
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