Analysis of chaotic properties of bluff body wake using a computer vision system
Novak, Matej, 1968- ...
ǂThe ǂanalysis was made of chaotic properties of the turbulent mixing flow in the wake of a prismatic bluff body in an open-return subsonic wind tunnel (Re[b] = 5100), using flow visualization and a ...digital image-processing technique. A high-speed camera was used to capture smoke visualization images of the turbulent mixing flow structures. A quantitative analysis was made on time series, obtained by simultaneous digitization of scalar properties in several small areas (windows) of the overall image. In order to evaluate the minimum number of effective degrees of freedom of the observed regions, a correlation dimension of the chaotic attractor was determined for respective window positions. As the recirculation region is entered, by decreasing the distance of the window from the wake, the correlation dimension rises. This is connected to increased flow complexity near the axis zone behind the bluff body. In power spectra this gives rise to the occurrence of higher harmonics. Phase portraits were derived for light intensity time series in different windows. An average local deformation was calculated for these trajectories. This deformation increases close to the wake axis, corresponding to a rise in correlation dimension. The results of extensive study of chaotic properties over the entire flow field around and behind bluff body were compared to power spectra of the respective light intensity signals.
It was not necessary to add the material to the shelf.
Bibliographic material was successfully added on shelf.
Adding bibliographical material on shelf was not successful.
Material is already on the shelf.
Permalink
URL:
Impact factor
Access to the JCR database is permitted only to users from Slovenia. Your current IP address is not on the list of IP addresses with access permission, and authentication with the relevant AAI accout is required.
Year
Impact factor
Edition
Category
Classification
JCR
SNIP
JCR
SNIP
JCR
SNIP
JCR
SNIP
Select the library membership card:
DRS,
in which the journal is indexed
Database name
Field
Year
Links to authors' personal bibliographies
Links to information on researchers in the SICRIS system
Subject headings in COBISS General List of Subject Headings
Select pickup location
The material from the parent unit is free. If the material is delivered to the pickup location from another unit, the library may charge you for this service.
