Lagrangian visualization of turbulent field by using correlation technique

Autor:	Ryozo Echigo, Hideo Yoshida, Kenichi P. Kobayashi, Kazuyuki Morishita
Rok vydání:	1996
Předmět:	Physics Jet (fluid) Field (physics) business.industry Turbulence Acoustics Visualization Physics::Fluid Dynamics Optics Flow (mathematics) Position (vector) Personal computer Mean flow business
Zdroj:	Journal of the Visualization Society of Japan. 16:195-198
ISSN:	1884-037X 0916-4731
DOI:	10.3154/jvs.16.1supplement_195
Popis:	To investigate the evolving process of the large structures in turbulence, imageprocessing technique for traversing camera at mean flow velocity along the axis of the flow was developed by using cross-correlation technique and applied to the axisymmetric jet. In order to obtain a complete velocity profiles, a traversing unit for CCD was controlled by a personal computer to synchronize its traversing rate with the mean flow. Video signals from the CCD were recorded continuously on VTR with two binary barcode; one for identify the video field, the other for specify the camera position and the traversing rate. From recorded images, the cross-correlation technique was employed to obtain two-dimensional velocity distributions. From successive maps of instantaneous velocity and vorticity distribution, the motion of large eddies (vortex pairing, entrainment) can be dynamically revealed which was unable to measure by fixed camera measuring techniques.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::841b7666871d98a3e1c5e3b1279fb4f1 https://doi.org/10.3154/jvs.16.1supplement_195 Zobrazit plný text záznamu