Assessment of force models on finite-sized particles at finite Reynolds numbers |
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Authors: | Ruyang LI Weixi HUANG Lihao ZHAO Chunxiao XU |
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Institution: | Applied Mechanics Laboratory(AML), Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China |
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Abstract: | Finite-sized inertial spherical particles are fully-resolved with the immersed boundary projection method(IBPM) in the turbulent open-channel flow by direct numerical simulation(DNS). The accuracy of the particle surface force models is investigated in comparison with the total force obtained via the fully-resolved method. The results show that the steady-state resistance only performs well in the streamwise direction, while the fluid acceleration force, the added-mass force, and the shear-induced Saffman lift can effectively compensate for the large-amplitude and high-frequency characteristics of the particle surface forces, especially for the wall-normal and spanwise components. The modified steady-state resistance with the correction effects of the acceleration and the fluid shear can better represent the overall forces imposed on the particles, and it is a preferable choice of the surface force model in the Lagrangian point-particle method. |
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Keywords: | finite-sized particle immersed boundary projection method (IBPM) force model Saffman lift |
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