6 papers
Low-dimensional structure and online tracking of POD subspaces on the Grassmann manifold: application to flow around an airfoil
Shintaro Sato, Yoshitsugu Naka, Rei Sasaki +2
Representing flow states over a wide range of flow parameters and control inputs in a low-dimensional state space is a central challenge in fluid mechanics. Rather than representin…
Improvement of reduced-order model for two-dimensional cylinder flow based on global proper orthogonal decomposition in terms of robustness and computational speed
Yuto Nakamura, Shintaro Sato, Naofumi Ohnishi
Reduced-order models (ROMs) are widely used in fluid engineering to enable rapid prediction of flow fields for parametric analysis, design optimization, and control applications. P…
On the conservation of physical properties in operator interpolation of parameterized hydrodynamic systems
Yuto Nakamura, Shintaro Sato, Naofumi Ohnishi
Reduced-order models (ROMs) that capture changes in fluid systems due to variations in parameters, such as the Reynolds number or the shape of a stationary body placed in the flow,…
Energy transfer and budget analysis for transient process with phase-averaged reduced-order model
Yuto Nakamura, Yuma Kuroda, Shintaro Sato +1
We derive a phase-averaged representation of transient flows based on the eigenmodes of a data-driven linear operator that approximates the Navier-Stokes dynamics. In performing ph…
Uncovering triadic interaction relationships latent in Mode A behind a circular cylinder
Yuto Nakamura, Shintaro Sato, Naofumi Ohnishi
Coherence between multiple low-frequency components latent in the flow fields characterizes the nonlinear aspects of fluid dynamics. This study reveals the existance of the distinc…
Parametric reduced-order modeling and mode sensitivity of actuated cylinder flow from a matrix manifold perspective
Shintaro Sato, Oliver T. Schmidt
We present a framework for parametric proper orthogonal decomposition (POD)-Galerkin reduced-order modeling (ROM) of fluid flows that accommodates variations in flow parameters and…