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您的检索式：作者名="Shengbin Di"
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| 1 | Simulation of dynamic fluid-solid interactions with an improved direct-forcing immersed boundary method显示文摘Dynamic fluid-solid interactions are widely found in chemical engineering,such as in particle-laden flows,which usually contain complex moving boundaries.The immersed boundary method(IBM) is a convenient approach to handle fluid-solid interactions with complex geometries.In this work,Uhlmann's direct-forcing IBM is improved and implemented on a supercomputer with CPU-GPU hybrid architecture.The direct-forcing IBM is modified as follows:the Poisson's equation for pressure is solved before evaluation of the body force,and the force is only distributed to the Cartesian grids inside the immersed boundary.A multidirect forcing scheme is used to evaluate the body force.These modifications result in a divergence-free flow field in the fluid domain and the no-slip boundary condition at the immersed boundary simultaneously.This method is implemented in an explicit finite-difference fractional-step scheme,and validated by 2D simulations of lid-driven cavity flow,Couette flow between two concentric cylinders and flow over a circular cylinder.Finally,the method is used to simulate the sedimentation of two circular particles in a channel.The results agree very well with previous experimental and numerical data,and are more accurate than the conventional direct-forcing method,especially in the vicinity of a moving boundary. | Shengbin Di Wei Ge | 2015 | Particuology2015，13，1： | 6 |
| 2 | Numerical simulation of stirred tanks using a hybrid immersed-boundary method显示文摘Conventionally, multiple reference frame(MRF) method and sliding mesh(SM) method are used in the simulation of stirred tanks, however, both methods have limitations. In this study, a hybrid immersed-boundary(IB)technique is developed in a finite difference context for the numerical simulation of stirred tanks. IBs based on Lagrangian markers and solid volume fractions are used for moving and stationary boundaries, respectively, to achieve optimal efficiency and accuracy. To cope with the high computational cost in the simulation of stirred tanks, the technique is implemented on computers with hybrid architecture where central processing units(CPUs) and graphics processing units(GPUs) are used together. The accuracy and efficiency of the present technique are first demonstrated in a relatively simple case, and then the technique is applied to the simulation of turbulent flow in a Rushton stirred tank with large eddy simulation(LES). Finally the proposed methodology is coupled with discrete element method(DEM) to accomplish particle-resolved simulation of solid suspensions in small stirred tanks. It demonstrates that the proposed methodology is a promising tool in simulating turbulent flow in stirred tanks with complex geometries. | Shengbin Di Ji Xu Qi Chang Wei Ge | 2016 | Chinese Journal of Chemical Engineering2016，24，9： | 1 |
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