Book ChapterDOI
Numerical Modelling of Bed Shear Stress in OpenFOAM
Nandakumar Visuvamithiran,V. Sriram,Jaya Kumar Seelam +2 more
- pp 637-645
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TLDR
In this article, bed shear stress is estimated from the numerical simulations using OpenFOAM, which is calculated from viscous force on the bed by integrating the pressure and the skin frictional forces.Abstract:
In coastal zones, erosion is the major threat to the livelihood as it leads to the water inundation into the human premises. Sediment transport results in erosions causes morphological changes and also affects the coastal ecosystem. The sediment transport processes are primarily driven by bed shear stress induced by waves and currents. As bed shear stress plays a major role in the determining sediment transport rates, the accuracy of sediment transport models mainly rely on the basis of bed shear stress measurements. So, there is a need to measure the reliable bed shear stress to improve the effectiveness of sediment transport models. In coastal zones when the waves enter into the low water depth, it starts to feel the bottom and the effect of shear stress at the bottom will be high. In this paper, bed shear stress is estimated from the numerical simulations using OpenFOAM. In OpenFOAM, bed shear stress is calculated from viscous force on the bed by integrating the pressure and the skin frictional forces. Surface elevation and flow velocity were measured using the numerical gauges. This bed shear stress can be directly incorporated into the shields parameter. In this study, numerical simulations in OpenFOAM were carried out for the regular sinusoidal waves with a time step of 0.001 s for a total duration of 16 s. OpenFOAM uses the waves2Foam toolbox for wave generation in the numerical wave tank.read more
References
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Journal ArticleDOI
Wave boundary layers amd friction factors
TL;DR: In this article, the problem of wave height damping due to bottom friction has received increasing attention among near-shore oceanographers, and the aim is to make it possible to determine the proper flow regime for a pure short-period wave motion over a given bed.
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Turbulent oscillatory flow over rough beds
TL;DR: In this article, a laser-Doppler anemometer was used to measure the velocity of turbulent oscillatory flow over rough beds, where the rough beds consisted of a single layer of sand, gravel or pebbles on a flat surface.
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Particle image velocimetry measurements within a laboratory-generated swash zone
TL;DR: In this paper, a particle image velocimetry (PIV) technique is used to make vertically resolved two-dimensional measurements in swash zone flows, which are notoriously recalcitrant to quantitative measurement.
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Direct bed shear stress measurements in bore-driven swash
TL;DR: In this article, the authors measured the bed shear stress through the leading edge of the uprush, which is typically two-four times greater than the backwash shear stresses at corresponding flow velocity.
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OpenFOAM for computational fluid dynamics
TL;DR: This paper discusses the emergence, availability, and large-scale use of OpenFOAM, which belongs to the contemporary open-source trend not unlike the roles played by the Linux operating system or the Internet encyclopedia Wikipedia.