Marco Edoardo Rosti (Okinawa Institute of Science and Technology)
The figure shows that away from the wall, at the top, turbulence is 2D and characterized by coherent and large vortices. On the other hand, at the bottom the wall causes turbulence to become 3D, characterized by the presence of small-scale vortices. Ultimately, 2D turbulence cannot be sustained over a rigid surface, since the presence of the wall will eventually make it 3D, even at large distance from the wall.
作品002 Interface dynamics above a vegetated bed
Giulio Foggi Rota (Okinawa Institute of Science and Technology), Alessandro Chiarini (Okinawa Institute of Science and Technology), Marco Edoardo Rosti (Okinawa Institute of Science and Technology)
The water flow in streams and rivers is typically turbulent and separated from the air above by an interface, while it often develops above a vegetated bed. To explore this, we perform realistic simulations of the air-water flow over a submerged vegetation canopy, accurately capturing the interface between the two fluids and individually resolving each canopy element. This visualization highlights the deformation of the interface, driven by the complex interactions among the three phases of the system: air, water, and vegetation. Our study provides insight into natural canopy-flow dynamics and informs future engineering solutions (e.g., for coastal protection purposes).
Stationary and traveling waves transition of 3D boundary layer around a main wing of CRM-NLF model is reproduced by RANS-DNS 'inverse' hybrid simulation at cruise condition: Ma 0.85, Re 17,500,000
Kai-en Yang (The University of Tokyo), Shuo Li (The University of Tokyo), Mikio Sakai (The University of Tokyo)
Our proposed Multi-timescale Reduced Order Model (MT-ROM) achieves high-speed and accurate predictions of large-scale solid-fluid flow simulations in a fluidized bed, marking a critical advancement toward the realization of the cyber-physical digital twin for the powder industry.