Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : November 07, 2019 - November 08, 2019
We have investigated the condition developing a small disturbance introduced in boundary layer. From result obtained, it had cleared that the wavenumber of velocity fluctuation in undeveloped spot converged near upper branch of the linear stability theory, and that of developing spot converged near lower branch. It indicates that the development of spot related to spacing of the hairpin vortex in the spot. Since its result was obtained for a specific Reynolds number, we need to investigate widely for various Reynolds number. Therefore, the purpose of this study was to clarify the relationship between development of spot and wavenumber of velocity fluctuation in spot for various Reynolds number. From result obtained, it was cleared that the development of spot can be arranged by the wavenumber evaluated from first spacing between hairpin vortices. However, it is necessary to consider that which part of spot should evaluate the wavenumber.
