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A CFD-DEM-IBM method with high resolution is proposed based on the immersed boundary method（IBM） to describe the sedimentation phenomenon accurately and to investigate the underlying influence mechanism between fluid and particles in dense fluid-particle systems. The fluid phase is analyzed by the computational fluid dynamics（CFD） while the discrete element method（DEM） is utilized to simulate the motion of individual particles. The IBM is introduced to tackle the moving boundaries of particles and the interaction forces between fluid and particles are considered by an extra body force added to the Navier-Stokes momentum equation. The strongly coupled fluid-solid system is then achieved through the successive iterative scheme where several iterations are required within each time step until the convergence conditions are exactly satisfied. Sedimentations of one, two and multiple particles are simulated, which reveal that the proposed method could obtain the accurate interaction forces among discrete particles and fluid along with the fully resolved fluid phase around the particles compared with the conventional unresolved CFD-DEM method. The agreement between present results and previous work demonstrates the accuracy and validity of the presented method, and the applicability together with the superiority of the CFD-DEM-IBM method is also proved when the dense particulate flows occur. [ABSTRACT FROM AUTHOR]

The immersed boundary method(IBM)was rapid developed in recent years because of its flexibility for complex configurations and moving bodies. Up to date, most of the resear-ches on IB method focused on the incompressible flow due to the limitation of the interpolation method. The current research applied the Choi’s power-law interpolation and the Crocce-Buse-mann relationship for the velocity and temperature approximation in the objective cells. The ghost cell method was also used for computing the variables at the cells in the body. The subson-ic/transonic NACA0012 airfoil compressible cases and 2D supersonic cylinder benchmark cases were chosen for method validation. The numerical result of these benchmark cases with proper parameter k compared well with the experimental data. The mesh convergence of the new method has also been proved. The analysis and discussion show that the method is suitable for compressi-ble flow simulation. [ABSTRACT FROM AUTHOR]