A new measure using Kolmogorov complexity and its application for fluid mixing and turbulent transition

2015 Fiscal Year Final Research Report

• Project/Area Number: 25420124
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Fluid engineering
• Research Institution: The University of Tokushima
• Principal Investigator: ICHIMIYA Masashi 徳島大学, ソシオテクノサイエンス研究部, 准教授 (50193454)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 乱流 / 境界層 / 混合層 / 複雑さ

Outline of Final Research Achievements

For the fluid mixing and turbulence transition process, the complexity of time sequence of fluid velocity signal was obtained. It was applied into three flow fields: a mixing layer between jet and surrounding fluid, a boundary layer in which the velocity of the fluid decreased due to the friction, and pipe flow.
In the mixing layer, the complexity was able to show the progress of the mixing and turbulence transition processes quantitatively. In the flat-plate boundary layer and pipe flow an objective judgment based on the complexity mostly supported the subjective conventional criterion. Additionally, with the aid of the complexity we could distinguish the complexity within the turbulent region, but with the conventional way, we could not.

Free Research Field

工学