STEADY-STATE RISER SIMULATIONS USING FILTERED GAS-SOLID FLOW MODELS
Multi-scale and/or multi-disciplinary approach to process-product innovation
CFD & Chemical Engineering- II (T3-4b)
Keywords: Gas-Solid Flow, Filtered Models, Apparent Added Mass, Apparent Drag Force, Computational Fluid Dynamics
To account for sub-grid-scale phenomena in coarse grid simulations, correlation terms appearing in the filtered gas-solid flow equations have to be modeled. Filtered models for the gas-solid momentum transfer are focused on and possible approaches are presented and evaluated. The evaluation supports the combination of an apparent distribution of the filtered gas phase pressure gradient over the phases and an apparent drag force to describe filtered gas-solid momentum transfer. As the filter frequency decreases, the contribution of the apparent distribution of the filtered gas phase pressure gradient over the phases to the filtered description of gas-solid momentum transfer gradually grows in importance up to a mass fraction based distribution, whereas the contribution of the apparent drag gradually vanishes, the mesoscopic description of gas-solid momentum transfer gradually being replaced by a more macroscopic description.
Three-dimensional steady-state simulations of developing flow in the bottom section of a riser are presented that illustrate the importance of using filtered gas-solid flow models for coarse grid simulations.
Presented Tuesday 18, 15:00 to 15:20, in session CFD & Chemical Engineering- II (T3-4b).
