Jorge Salinas

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Papers by Jorge Salinas

Dynamics of turbidity currents: Ambient fluid entrainment and basal drag

Bulletin of the American Physical Society, 2019

Turbidity currents are sediment laden flows that run along inclined or horizontal surfaces. They ... more Turbidity currents are sediment laden flows that run along inclined or horizontal surfaces. They are driven by the excess hydrostatic pressure resulted from the density difference between the current carrying sediment and the clear ambient fluid. The amount of particles carried is influenced by the strong coupling between turbulence and suspended sediment. In this work we perform direct numerical simulations (DNS) of spatially evolving, spanwise-homogeneous turbidity currents. We focus our attention on the process of entrainment of clear ambient fluid that happens at the interface between the current and the ambient layer. Moreover, the study of basal drag is performed. Turbidity currents have been studied in the past by means of layer-averaged equation models, which make use of several closure models. Two of these models are the entrainment assumption and the basal drag model. In this work we analyze the dependence of these models with the flow parameters (bulk Richardson and Reynolds numbers) together with the settling velocity of the sediment. We pay attention to the regime where the bulk properties of the flow vary slowly, called normal condition. Furthermore, we analyze the effect of acceleration/deceleration of the flow away from normal condition.

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Mixing at a sediment concentration interface in turbulent open channel flow

Environmental Fluid Mechanics, 2017

In this work we address the role of turbulence on mixing of clear layer of fluid with sediment-la... more In this work we address the role of turbulence on mixing of clear layer of fluid with sediment-laden layer of fluid at a sediment concentration interface. This process can be conceived as the entrainment of sediment-free fluid into the sediment-laden layer, or alternatively, as the transport of sediment into the top sediment-free flow. This process is governed by four parameters-Reynolds number of the flow Re s , non-dimensional settling velocity of the sediment (proxy for sediment size)Ṽ, Richardson number Ri s and Schmidt number Sc. For this work we have performed direct numerical simulations for fixed Reynolds and Schmidt numbers while varying the values of Richardson number and particle settling velocity. In the simple model considered here, the flow's momentum and turbulence pre-exists over the entire layer of fluid, while the sediment is initially confined to a layer close to the bed. Mixing of sediment-free fluid with the sediment-laden layer is associated primarily with upward transport of sediment and buoyancy. There is no simultaneous upward transport of fluid momentum and turbulence into the sediment-free fluid layer, which is already in motion and turbulent. The analysis performed shows that

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Direct numerical simulation of Coriolis effects on cylindrical gravity currents

OATAO is an open access repository that collects the work of Toulouse researchers and makes it fr... more OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible.

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Cardioinhibition Secondary to Ventricular Pacing

Journal of Cardiovascular Electrophysiology, 2006

1. J Cardiovasc Electrophysiol. 2006 Mar;17(3):325-7. Cardioinhibition secondary to ventricular p... more 1. J Cardiovasc Electrophysiol. 2006 Mar;17(3):325-7. Cardioinhibition secondary to ventricular pacing. Salinas J, Pérez-Castellano N, Isa R, Villacastín J. Unit of Arrhythmias, Cardiovascular Institute, San Carlos University Hospital, Madrid, Spain. ...

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Simulations of rotating planar and cylindrical gravity currents

Gravity currents are generated by the action of gravity (or other volumetric force) on changes in... more Gravity currents are generated by the action of gravity (or other volumetric force) on changes in fluid density. When they appear in turbulent regime, gravity currents are of a non-linear nature and have a wide range of temporal and spatial scales. In these systems there is a strong coupling between turbulence and stratification effects, with important consequences in the exchange of mass, momentum and energy. When these type of flows happen in geophysical scale, the analysis is further complicated by the influence of rotation effects by the Coriolis forces originated by earth's rotation. In this work we address the rotational effects in gravity currents with cylindrical initial condition by menas of direct numerical simulations (DNS). We report results on five three-dimensional DNS with grid resolutions up to 166-million points, with different boundary conditions, Reynolds numbers (Re=4000 and Re=8000), and different conditions of rotation. The results focus mainly on the distance of propagation of the fronts, frequency of the successive outward fronts, and the turbulent structures present in the currents and their influence in flow dynamics.

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Jorge Salinas

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