Direct numerical simulation for lid-driven cavity under various Reynolds numbers in fully staggered grid

Article Mechanics

Lid-driven cavity flow-induced dynamics of a neutrally buoyant solid: Effect of Reynolds number, flexibility, and size

Vinay Prasad et al.

Summary: This study investigates the motion induced by a recirculating flow in a neutrally buoyant and deformable circular solid. Results show that the solid undergoes transient spiraling motion before reaching a periodic orbit-based limit cycle. The flow also transitions into a periodic state after initial transients. The time-averaged flow velocity and centroid velocity of the solid increase with increasing Reynolds Number, non-dimensional shear modulus, and decreasing solid volume fraction. The equivalent radius of the limit cycle and its frequency increase with Reynolds Number and decrease with decreasing shear modulus or increasing solid volume fraction. The transition from a single loop to a double loop limit cycle occurs when the solid volume fraction exceeds a critical value. These findings are important for predicting and controlling the motion of solids in fluid flows, which has applications in various industries and biology.

PHYSICS OF FLUIDS (2022)

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Article Polymer Science

Flow Behaviors of Polymer Solution in a Lid-Driven Cavity

Cuong Mai Bui et al.

Summary: This study numerically investigates the flow behavior of polymers in a lid-driven cavity, inspired by the coating process, over a wide range of Oldroyd numbers (0 <= Od <= 50). The results show that the flow characteristics of polymers, such as velocity, viscosity, and vortex distributions, are significantly influenced by viscoplastic behaviors. Additionally, solid-like regions are observed in the flow patterns, and their size increases and tends to merge together as Od increases. The cavity width/aspect ratio and skewed angle also have significant impacts on the vortex structures and the formation of solid-like regions.

POLYMERS (2022)

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Article Mechanics