Digital Twin Initiatives at Tohoku University

― Demonstration Test using Low-turbulence Heat Transfer Wind Tunnel, MSBS facility and Data Assimilation ―

Abstract

The Institute of Fluid Science, Tohoku University, is capable of conducting various thermal-fluid experiments, and has been operating a new supercomputer in the Next-Generation Fusion Research System (AFFINITY) since August 2024. The authors have been working on reducing drag by delaying the transition on the surface of the main wing of large passenger aircraft. In particular, they have succeeded in reproducing the attachment line and the traveling waves of cross-flow instability, and have obtained new knowledge that the generation of traveling waves should take into account not only the conventional turbulence intensity but also the frequency band. They have proposed several laminarization devices, and are conducting demonstration tests toward practical use using the low-turbulence heat transfer wind tunnel and magnetic suspension and balance system. In addition, I will introduce research on data assimilation of Schlieren images to predict the ignition delay phenomenon of spray combustion, which was published as an academic paper in 2024.