Vortex-induced vibration and heat dissipation of multiple cylinders under opposed thermal buoyancy

Ocean Engineering, Journal Year: 2023, Volume and Issue: 270, P. 113669 - 113669

Published: Jan. 16, 2023

Language: Английский

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Transverse vortex-induced vibration of two elliptic cylinders in tandem: Effects of spacing

Physics of Fluids, Journal Year: 2023, Volume and Issue: 35(11)

Published: Nov. 1, 2023

Renewable energy converters, such as bio-inspired fluttering foils, are gaining popularity due to their eco-friendly properties. However, the system with multiple objects has received scant attention. Here, we analyze how spacing influences transverse (one-degree-of-freedom) vortex-induced vibration of two tandem identical elliptic cylinders at a constant Reynolds number by employing wide range reduced velocities (Ur∈[2,14]) and space ratios (L∗∈[2,6]). The incompressible Navier–Stokes equations solved using overset mesh method in OpenFOAM® library. findings indicate that wake structure goes through eight distinct modes, well gap flow patterns (reattachment co-shedding). Vibrational responses, force parameters, determine three configurations. At small (L∗=2), upstream cylinder (UC) traditional lock-in (the frequency ratio fy/fn≃0.95–1.05) velocity (Ur≃7), downstream (DC) narrow region around Ur≃9. UC soft-lock-in synchronization fy/fn≃1.15) high (Ur≃8–10). vibrations both cylinders, but especially DC, reach relatively amplitudes. moderate (L∗=3), bears zone analogous single same mass ratio, while DC shows vast (Ur≃8–14). large (L∗=4, 5, 6), amplitude is often larger than when it region. exhibits peak Ur = 7 wake-galloping for > 12.

Language: Английский

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Flow-induced rotation and wake characteristics of polygonal prisms subjected to laminar flow

Physics of Fluids, Journal Year: 2023, Volume and Issue: 35(5)

Published: May 1, 2023

This work presents numerical investigations of flow-induced rotation three different polygonal prisms, including triangular, square, and pentagonal ones. Taking into account the torsional stiffness damping, response is examined in a reduced velocity range Ur = 3–15 at Re 100. Four distinct oscillating regimes associated vortex shedding modes are identified: 2S mode bifurcated-steady regime (3 ≤ < 5 10 15 for triangular prism, 7 11 square prism), 4S bifurcated-unsteady (12 6S non-bifurcated (5 quasi-static 8 whole prism). Moreover, competitions between pressure-induced torque shear-induced vary these four regimes. Specifically, dominant component By contrast, two kinds torques owning nearly equal proportions possess same opposite sign regimes, respectively. The root-mean-squared rotary angle (θrms) depends on cross-sectional shape velocity. θrms prism suddenly drops to level freely rotating case before rising stages. starts rotate violently when it enters regime. For vortex-induced vibration-like observed. Due general largest group, followed by sequence.

Language: Английский

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Vortex-induced vibration suppression of cactus-like cylinders

Ocean Engineering, Journal Year: 2024, Volume and Issue: 299, P. 117201 - 117201

Published: March 6, 2024

Language: Английский

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Numerical study on hydrodynamic interaction characteristics of vortex-induced vibration of two side-by-side cylinders near the wall

Ocean Engineering, Journal Year: 2024, Volume and Issue: 308, P. 118305 - 118305

Published: May 30, 2024

Language: Английский

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