Abstract:
A computational study on the geometric and kinematic characteristics of the organized
structures in a turbulent boundary layer is presented in this thesis. It contains primarily
the explanations of various aspects of two-point space-time correlation measurements in
a turbulent boundary layer done by previous researchers in light of the attached eddy
model of turbulence. For a successful prediction of turbulence statistics using the
attached eddy model, the detailed knowledge of eddy geometry and their kinematic
behavior is very vital. Unfortunately, as off today very little is known about it.
The numerical results show, a good degree of qualitative agreement with those found by
experimental researchers. It appears that for a better quantitative agreement between the
two, additional structures, as well as further modifications of the representative eddy
geometry are necessary. This indicates a complicated eddy structure that needs rather
complicated mathematical treatment requiring time intensive computer simulation.
However, the effect of the change in the number of length scales in eddy hierarchy range
was found to be negligible when the number is over 128.
