A Bingham Plastic Fluid Solver for Turbulent Flow of Dense Muddy Sediment Mixtures
نویسندگان
چکیده
We have developed and tested a numerical model for turbulence resolving simulations of dense mud–water mixtures in oscillatory bottom boundary layers, based on low Stokes number formulation the two-phase equations. The resulting non-Boussinesq equation fluid momentum is coupled to transport mud volumetric concentration, giving rise volume-averaged velocity that non-solenoidal, was implemented as new compressible flow solver. An oscillating pressure gradient force correction step standard semi-implicit method linked equations (SIMPLE), consistency with treatment other volume forces (e.g., gravity). solver further library Bingham plastic materials, order rheological properties using empirically determined concentration-dependent yield stress viscosity. present three direct simulation tests validate MudMixtureFoam against previous solutions experimental data. first considered steady uniform concentration around sphere, numbers ranging from 1 100 Reynolds 0.1 100. second development layer flow, showed formation an intermittently turbulent peak perturbations exceeding 10 percent freestream occurring at distance comparable thickness. third effects density stratification due resuspended sediment bulk Richardson 1×10−4 Stokes–Reynolds 1000, lutocline between 20 40 depths. In all cases, produced excellent agreement results.
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ژورنال
عنوان ژورنال: Fluids
سال: 2023
ISSN: ['2311-5521']
DOI: https://doi.org/10.3390/fluids8060171