: In this work, we perform fully three-dimensional numerical simulations of the flow field surrounding cylindrical structures characterized by different types of corrugated surface. The simulations are carried out using the Lattice Boltzmann Method (LBM), considering a flow regime with a Reynolds number [Formula: see text]. The fluid-dynamic wake structure and stability are investigated by means of PSD analyses of the velocity components and by visual inspection of the vortical coherent structure evolution. Moreover, the energy dissipation of the flow is assessed by considering an equivalent discharge coefficient [Formula: see text], which measures the total pressure losses of the flow moving around the various layout under investigation. Outcomes from our study demonstrate that the helical ridges augment energy dissipation, but might also have a role in the passive control of the characteristic frequencies of the unsteady wake flow.

Krastev, V.k., Amati, G., Succi, S., Falcucci, G. (2018). On the effects of surface corrugation on the hydrodynamic performance of cylindrical rigid structures. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER, 41(8) [10.1140/epje/i2018-11703-y].

On the effects of surface corrugation on the hydrodynamic performance of cylindrical rigid structures

Krastev V. K.;Falcucci G.
2018-01-01

Abstract

: In this work, we perform fully three-dimensional numerical simulations of the flow field surrounding cylindrical structures characterized by different types of corrugated surface. The simulations are carried out using the Lattice Boltzmann Method (LBM), considering a flow regime with a Reynolds number [Formula: see text]. The fluid-dynamic wake structure and stability are investigated by means of PSD analyses of the velocity components and by visual inspection of the vortical coherent structure evolution. Moreover, the energy dissipation of the flow is assessed by considering an equivalent discharge coefficient [Formula: see text], which measures the total pressure losses of the flow moving around the various layout under investigation. Outcomes from our study demonstrate that the helical ridges augment energy dissipation, but might also have a role in the passive control of the characteristic frequencies of the unsteady wake flow.
2018
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore ING-IND/08 - MACCHINE A FLUIDO
English
Topical issue: Fluids and Structures: Multi-scale coupling and modeling
Computer Simulation
Kinetics
Surface Properties
Hydrodynamics
Krastev, V.k., Amati, G., Succi, S., Falcucci, G. (2018). On the effects of surface corrugation on the hydrodynamic performance of cylindrical rigid structures. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER, 41(8) [10.1140/epje/i2018-11703-y].
Krastev, Vk; Amati, G; Succi, S; Falcucci, G
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/296435
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