Abstract
Abstract. In this paper, a three-dimensional two-phase flow solver, SedFoam-2.0, is presented for sediment transport applications. The solver is extended from twoPhaseEulerFoam available in the 2.1.0 release of the open-source CFD (computational fluid dynamics) toolbox OpenFOAM. In this approach the sediment phase is modeled as a continuum, and constitutive laws have to be prescribed for the sediment stresses. In the proposed solver, two different intergranular stress models are implemented: the kinetic theory of granular flows and the dense granular flow rheology μ(I). For the fluid stress, laminar or turbulent flow regimes can be simulated and three different turbulence models are available for sediment transport: a simple mixing length model (one-dimensional configuration only), a k − ε, and a k − ω model. The numerical implementation is demonstrated on four test cases: sedimentation of suspended particles, laminar bed load, sheet flow, and scour at an apron. These test cases illustrate the capabilities of SedFoam-2.0 to deal with complex turbulent sediment transport problems with different combinations of intergranular stress and turbulence models.
Highlights
Sediment transport is the main process that drives the morphological evolution of fluvial and coastal environments
In SedFoam-2.0, several different viscosity or turbulence closures are implemented, and these models can be selected according to specific flow conditions ranging from laminar to turbulent flows, and in particular, the mixture viscosity can be selected in combination with the granular rheology model for the granular stresses
In this subsection the model results are compared with experimental results from Revil-Baudard et al (2015) and Sumer et al (1996) for turbulent sheet flows; the goal of these test cases is to validate the numerical implementation of different turbulence models and to calibrate the free parameter B
Summary
Sediment transport is the main process that drives the morphological evolution of fluvial and coastal environments. Simple parameterization solely on the bed shear stress may be insufficient; for example, the role of pressure gradient in sediment transport has been identified for extreme events such as storms (Foster et al, 2006; Cheng et al, 2017a) Addressing these issues requires the development of comprehensive models that account for the variety of complex hydrodynamics and sediment transport processes on a regional-scale setting (e.g., Lesser et al, 2004; Roelvink et al, 2009). Our final goal is to provide a comprehensive numerical framework that solves the two-phase flow equations in three dimensions with the capability to select different combinations of turbulence and granular stress models for sediment transport applications.
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