Measurement of velocity and velocity derivatives based on pattern tracking in 3D LIF images |
| |
Authors: | S Deusch H Merava T Dracos P Rys |
| |
Institution: | (1) Department of Chemical Engineering, Swiss Federal Institute of Technology, 8092 Zurich, Switzerland, CH;(2) Swiss Federal Institute of Technology, Untergasse 14, 8126 Zumikon, Switzerland, CH |
| |
Abstract: | Pattern tracking in consecutive 3D LIF images based on least squares matching (LSM) of grey levels has been developed recently
for velocity and velocity gradient measurements. The shortcomings of this method are clearly shown. The present article presents
an improvement on this method by introducing a local multi-patch (LMP) technique through the LSM approach. The method is validated
using the flow field of a turbulent channel flow obtained by direct numerical simulation (DNS) and a synthetic image with
grey-level patterns. The results show that LMP matching allows the determination of the velocity and the velocity gradient
fields with high accuracy including the second derivatives. Measurements of a round non-buoyant jet are presented which demonstrate
the good performance of the method when applied under laboratory conditions. This method can also be applied on two-dimensional
images provided that the flow is strictly two-dimensional.
Received: 7 July 1999/Accepted: 13 November 1999 |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|