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Large-Scale Discrete Element Modeling for a Gas-Solid-Liquid Flow System
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DOI：10.1021/acs.iecr.3c01511.png)
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Abstract
En 中文
Gas-solid-liquid three-phase flow systemsare ubiquitousin chemical and energy engineering. To simulate the multiphase systems,the authors' group has developed a numerical method that couplesthe discrete element method (DEM) and the volume of fluid (VOF) method,where the local volume average technique is employed. When the unresolvedDEM-VOF method is applied to industrial systems, there are two criticalproblems: one is the inflexibility to select the grid size for thegas-liquid-flow simulations, and the other is the heavycomputational cost due to a large number of particles. To solve theseproblems, a novel numerical method is proposed by introducing therefined grid model and coarse-grained model into the unresolved DEM-VOFmethod. Two types of verification tests are performed to illustratethe adequacy of the new method. First, a water entry problem of solidparticles is simulated to verify the combination of the refined gridmodel and the unresolved DEM-VOF method. Second, a gas-solid-liquidfluidized bed system is computed to verify the combination of therefined grid model, the coarse-grained DEM method, and the unresolvedDEM-VOF method. Through the verification tests, it is demonstratedthat the new method can flexibly give the grid size for the VOF regardlessof the solid particle size. Besides, the new approach makes it possibleto reduce the calculation time of the DEM to 4.6% of the originaltime. The new approach will drastically improve the numerical modelingfor gas-solid-liquid flows from the viewpoint of efficiency,accuracy, and flexibility.
Keywords:
NUMERICAL-SIMULATION
ARTIFICIAL DENSITY
AIR-FLOW
CFD-DEM
VALIDATION
EQUATION
Journal
I
IF:
3.9
Papers:
4.0W
Citations:
9.6W