Development of an optimal design framework for inducing pseudo laminar flow

Reference No.	2026a017
Type/Category	Grant for General Research-Short-term Joint Research
Title of Research Project	Development of an optimal design framework for inducing pseudo laminar flow
Principal Investigator	Kenji Shirota（Department of Information and Technology, Aichi Prefectural University・Professor）
Research Period
Keyword(s) of Research Fields	Inverse problem, Numerical analysis, Shape optimization problem, Topology optimization problem, Unsteady Navier-Stokes equations
Abstract for Research Report	This study aims to extract the latent orderly structures embedded in nonlinear fluid phenomena in natural rivers and to establish a theoretical framework that links these structures to flow design and control. We focus on developing a unified understanding—via the acceleration parameter K—of pseudo laminar flow, which forms a stable rectified field even under turbulence, and the expansion–contraction method, which induces order through geometric manipulation. This enables internal flow structures to be treated as design variables, improving predictability and supporting applications to river flow management. Our approach integrates bifurcation and dynamical systems analysis with high resolution radar observations, component separation data processing, structural extraction using DMD and PINNs, and a multi stage framework combining reinforcement learning with shape optimization. Through this integration, we construct a flexible mathematical foundation that connects theory, observation, and design. Expected outcomes include implementing optimized expansion–contraction structures in real rivers, numerically verifying pseudo laminar flow formation, and validating results through laboratory experiments. This ensures consistency between model based design and real world behavior, contributing to river control technologies that leverage natural order. Ultimately, the study proposes sustainable flood management strategies that utilize the self organizing capacity of natural systems, offering new directions for environmental and disaster prevention design under climate and urbanization pressures.
Organizing Committee Members (Workshop) Participants (Short-term Joint Usage)	Kenji Shirota（Department of Information Science and Technology, Aichi Prefectural University・Professor） Takashi Nakazawa（Emerging Media Initiative, Kanazawa University・Associate professor） Takeshi Takaishi（Department of Mathematical Engineering, Musashino University・Professor） Shinya Uchiumi（Laboratory of Mathematical Modeling, Research Institute for Electronic Science, Hokkaido University・Specially appointed associate professor） Yukinori Kametani（Department of Mechanical Engineering Informatics, Meiji University・Lecturer） Takashi Nakagawa（(Department of Integrated Science and Technology, Tsuyama National College of Technology・Specially-appointed professor） Kazunori Matsui（Department of Logistics and Information Engineering, Tokyo University of Marine Science and Technology・Assistant professor）