In this workwe present an enhancement of a free-surface Lattice Boltzmannmethod to evaluate pressure losses and wall roughness effects. Recent works in literature propose strategies to account for wall roughness, but mainly in small-scale computational domains, [1,2] or by means of a 2D approach, [3]. In the frame of 2D analyses, friction term has been defined in the shallow water problem as a function of slope of the bottom of the domain, roughness and water depth, [4]. In this work, three different strategies are proposed to account for wall roughness: a Smagorinsky-based approach, with an ad-hoc function to vary turbulent viscosity with the distance from the wall, an implementation of a partial-slip wall boundary collision and the simulation of roughness effects by means of an external force field, accounted for in the collision phase

LBM method for roughness effect in open channel flows

MANCIOLA, Piergiorgio
2012

Abstract

In this workwe present an enhancement of a free-surface Lattice Boltzmannmethod to evaluate pressure losses and wall roughness effects. Recent works in literature propose strategies to account for wall roughness, but mainly in small-scale computational domains, [1,2] or by means of a 2D approach, [3]. In the frame of 2D analyses, friction term has been defined in the shallow water problem as a function of slope of the bottom of the domain, roughness and water depth, [4]. In this work, three different strategies are proposed to account for wall roughness: a Smagorinsky-based approach, with an ad-hoc function to vary turbulent viscosity with the distance from the wall, an implementation of a partial-slip wall boundary collision and the simulation of roughness effects by means of an external force field, accounted for in the collision phase
2012
9780735410916
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11391/1117472
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