Wide Field of View Boundary Layer Images and Data


Here planar velocity data and selected velocity vector maps are available for viewing and/or download. Data are available for a zero-pressure gradient flat plate turbulent boundary layer at two Reynolds numbers: Req = 1015 and 7705. 2-dimensional velocity vectors are obtained in the streamwise/wall-normal plane, with field of view approximately 3d in x and over d in y. Relevant flow parameters are available for viewing or download in pdf format below. Approximately 50 realizations are taken at each Reynolds number.

Analysis and interpretation of the data is presented in the following references. These also provide further details of the flow facility, image acquisition, and interrogation procedure. The labels (in bold) attached to each reference are used below to identify images which are presented as figures in the papers.

AMT00
Adrian, R. J., Meinhart, C. D., and Tomkins, C. D., “Vortex Organization in the Outer Region of a Turbulent Boundary Layer”, J. Fluid Mech., in press.
TAB98
Tomkins, C. D., Adrian, R. J., and Balachandar, S., “The Structure of Vortex Packets in Wall Turbulence”, AIAA Paper No. 98-2962, 1998.
CT97
Tomkins, C. D., “A particle image velocimetry study of coherent structures in a turbulent boundary layer”, M.S. Thesis, University of Illinois at Urbana-Champaign, Urbana, IL, 1997.

View or download (pdf format) a table of relevant flow parameters here.

Images

For several realizations of particular interest at each Reynolds number velocity vector fields are available for viewing as “gif” images. Galilean decomposition is used in visualizing the velocity fields as discussed in AMT00; each field is plotted using 2 convection velocities (Uc). Some velocities are selected to reveal outer-region structures, and others near-wall structures, in addition to log-layer structures. Each image is plotted with two different magnifications. One is chosen so the viewed image will approximately fit on a single screen or page (“Page view”). The other is chosen to create an image roughly twice as large, so the viewer may scan the details of the flow more carefully (“Wide view”).

The realizations are selected to provide examples of a variety of structures observed in the data, including the vortex packets/ramp-like structures discussed in the above references, although common elements appear in each realization (hairpin vortex signatures, packets). It is also interesting to observe the range of scales within each realization, and the viewer will find examples of the “hierarchical” character of the structure. The page view images may also be downloaded in postscript format for printing.

High Reynolds Number

High Reynolds number (Req = 7705)
Realization Velocity vectors, Uc1
Page view
Velocity vectors, Uc1
Wide view
Velocity vectors, Uc2
Page view
Velocity vectors, Uc2
Wide view
High01 High01Uc1
View --- Download
High01Uc1wide
View
High01Uc2
View --- Download
High01Uc2wide
View
High02 High02Uc1
View --- Download
High02Uc1wide
View
High02Uc2
View --- Download
High02Uc2wide
View
High04 High04Uc1
View --- Download
High04Uc1wide
View
High04Uc2
View --- Download
High04Uc2wide
View
High05 High05Uc1
View --- Download
High05Uc1wide
View
High05Uc2
View --- Download
High05Uc2wide
View
High09
(AMT00 Fig. 19)
High09Uc1
View --- Download
High09Uc1wide
View
High09Uc2
View --- Download
High09Uc2wide
View
High13 High13Uc1
View --- Download
High13Uc1wide
View
High13Uc2
View --- Download
High13Uc2wide
View
High16
(AMT00 Fig. 20)
High16Uc1
View --- Download
High16Uc1wide
View
High16Uc2
View --- Download
High16Uc2wide
View
High19 High19Uc1
View --- Download
High19Uc1wide
View
High19Uc2
View --- Download
High19Uc2wide
View
High20
(AMT00 Fig. 23)
High20Uc1
View --- Download
High20Uc1wide
View
High20Uc2
View --- Download
High20Uc2wide
View
High31
(TAB98 Fig. 5)
High31Uc1
View --- Download
High31Uc1wide
View
High31Uc2
View --- Download
High31Uc2wide
View
High43 High43Uc1
View --- Download
High43Uc1wide
View
High43Uc2
View --- Download
High43Uc2wide
View

Low Reynolds Number

Low Reynolds number (Req = 1015)
Realization Velocity vectors, Uc1
Page view
Velocity vectors, Uc1
Wide view
Velocity vectors, Uc2
Page view
Velocity vectors, Uc2
Wide view
Low04 Low04Uc1
View --- Download
Low04Uc1wide
View
Low04Uc2
View --- Download
Low04Uc2wide
View
Low09 Low09Uc1
View --- Download
Low09Uc1wide
View
Low09Uc2
View --- Download
Low09Uc2wide
View
Low11
(TAB98 Fig. 6)
Low11Uc1
View --- Download
Low11Uc1wide
View
Low11Uc2
View --- Download
Low11Uc2wide
View
Low23 Low23Uc1
View --- Download
Low23Uc1wide
View
Low23Uc2
View --- Download
Low23Uc2wide
View
Low24 Low24Uc1
View --- Download
Low24Uc1wide
View
Low24Uc2
View --- Download
Low24Uc2wide
View
Low28 Low28Uc1
View --- Download
Low28Uc1wide
View
Low28Uc2
View --- Download
Low28Uc2wide
View
Low32 Low32Uc1
View --- Download
Low32Uc1wide
View
Low32Uc2
View --- Download
Low32Uc2wide
View
Low39 Low39Uc1
View --- Download
Low39Uc1wide
View
Low39Uc2
View --- Download
Low39Uc2wide
View
Low40 Low40Uc1
View --- Download
Low40Uc1wide
View
Low40Uc2
View --- Download
Low40Uc2wide
View
Low52 Low52Uc1
View --- Download
Low52Uc1wide
View
Low52Uc2
View --- Download
Low52Uc2wide
View

Data

The data are provided in a simple four-column ascii format. Each row of the data represents one velocity vector. The first two columns correspond to streamwise position x and wall-normal position y respectively, in physical units (mm). The third and fourth columns correspond to streamwise and wall-normal velocity u and v respectively, again in physical units (m/s). The units may be made dimensionless using the flow parameters file available above. The data files also include a one-line header so they can be immediately read into Tecplot. A few images interrogated poorly and were not included in the dataset.

Individual high Reynolds number realizations may be downloaded from the table below, or the entire dataset may be downloaded in a zipped package here.

High Reynolds Number

High Reynolds number (Req = 7705)
High01 High02 High03 High04 High05
High06 High07 High08 High09 1 High10
High11 High12 High13 High14 High15
High16 2 High17 High18 High19 High20 3
High21 High22 High23 High24 High25
High26 High27 High28 High29 High30
High31 4 High32 High33 High34 High35
High36 High37 High38 High39 High41
High42 High43 High44 High45 High46
High47 High48 High49 High50 High51

Low Reynolds Number

Individual low Reynolds number realizations may be downloaded from the table below, or the entire dataset may be downloaded in a zipped package here.

Low Reynolds number (Req = 1015)
Low01 Low02 Low03 Low04 Low05
Low06 Low07 5 Low08 Low09 Low10
Low11 6 Low12 Low13 Low14 Low15
Low21 Low22 Low23 Low24 Low25
Low26 Low28 Low29 Low30 Low32
Low33 Low34 Low35 Low36 Low37
Low38 Low39 Low40 Low41 Low42
Low43 Low45 Low46 Low47 Low48
Low49 Low50 Low51 Low52

Please direct any questions, comments, or suggestions to Professor Ronald Adrian (r-adrian@uiuc.edu) or Chris Tomkins (tomkins@uiuc.edu). This work was supported by the Office of Naval Research under Grant No. N0001-97-1-01091.