In this model, k-ε turbulent model considering of buoyancy term is taken into account. The nozzle diameter is 0.5 m and the sludge volume phase fraction is 0.001. The jet flow of 180m 3/h is introduced at the middle of the channel (velocity 1 m/s). The water depth is 5 m and the length of the channel is 20m. Here, we use this solver to simulate the 2D flow of water jet nozzle to observe the penetration length in the channel full of sludge. To understand the non-Newtonian models in OpenFOAM and how to implement a customized non-Newtonian model, see this tutorial. To read about the implemented models for driftFluxFoam solver, refer to. The available viscosity models for this solvers are Bingham plastic, plastic and slurry viscosity model. The solver is based on Pimple algorithm and can handle larger time steps and does not reply on under-relaxation. The driftFluxFoam is a transient solver for two incompressible fluids treated as a single mixture. The subscripts c, d, and m stands for continuous, dispersed and mixture phase, respectively. The two phases are defined by following equation:Īnd the velocity of the mixture is defined by: In other words, the two-phases in drift flux model are treated as a single fluid mixture in which the velocity, pressure and the density of individual phases are replaced by a single property of the mixture. In this model, only one continuity equation and one momentum equation are solved for the mixture. Sludge can be considered as a two-phase mixture in which the water is the continuous phase, and the sludge is the dispersed phase.ĭrift flux model assumes that the primary source of slip between the phases is gravitational settling of the dispersed phase.ĭriftFluxFoam solver is developed by Brennan’s PhD thesis based on mixture model approximation (former settlingFoam).
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