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| 1 | Ac- curacy improvement of the immersed boundary-lattice Bo- ltzmann coupling scheme by iterative force correction显示文摘 | Zhang Chunze Cheng Yongguang Zhu Luoding | 2015 | Computers and Fluids2015，124，2016： | 1 |
| 2 | Simulation of a pulsatile non-Newtonian flow past a stenosed 2D artery with atherosclerosis显示文摘 | Fang-Bao Tian Luoding Zhu Pak-Wing Fok Xi-Yun Lu | 2013 | Computers in Biology and Medicine2013，，9： | 1 |
| 3 | An IB Method for Non-Newtonian-Fluid Flexible-Structure Interactions in Three-Dimensions显示文摘Problems involving fluid flexible-structure interactions(FFSI)are ubiquitous in engineering and sciences.Peskin’s immersed boundary(IB)method is the first framework for modeling and simulation of such problems.This paper addresses a three-dimensional extension of the IB framework for non-Newtonian fluids which include power-law fluid,Oldroyd-B fluid,and FENE-P fluid.The motion of the non-Newtonian fluids are modelled by the lattice Boltzmann equations(D3Q19 model).The differential constitutive equations of Oldroyd-B and FENE-P fluids are solved by the D3Q7 model.Numerical results indicate that the new method is first-order accurate and conditionally stable.To show the capability of the new method,it is tested on three FFSI toy problems:a power-law fluid past a flexible sheet fixed at its midline,a flexible sheet being flapped periodically at its midline in an Oldroyd-B fluid,and a flexible sheet being rotated at one edge in a FENE-P fluid. | Luoding Zhu | 2019 | Computer Modeling in Engineering & Sciences2019，，4： | 0 |
| 4 | Numerical Study of Stability and Accuracy of the Immersed Boundary Method Coupled to the Lattice Boltzmann BGK Model显示文摘This paper aims to study the numerical features of a coupling scheme between the immersed boundary(IB)method and the lattice Boltzmann BGK(LBGK)model by four typical test problems:the relaxation of a circular membrane,the shearing flow induced by a moving fiber in the middle of a channel,the shearing flow near a non-slip rigid wall,and the circular Couette flow between two inversely rotating cylinders.The accuracy and robustness of the IB-LBGK coupling scheme,the performances of different discrete Dirac delta functions,the effect of iteration on the coupling scheme,the importance of the external forcing term treatment,the sensitivity of the coupling scheme to flow and boundary parameters,the velocity slip near non-slip rigid wall,and the origination of numerical instabilities are investigated in detail via the four test cases.It is found that the iteration in the coupling cycle can effectively improve stability,the introduction of a second-order forcing term in LBGK model is crucial,the discrete fiber segment length and the orientation of the fiber boundary obviously affect accuracy and stability,and the emergence of both temporal and spatial fluctuations of boundary parameters seems to be the indication of numerical instability.These elaborate results shed light on the nature of the coupling scheme and may benefit those who wish to use or improve the method. | Yongguang Cheng Luoding Zhu Chunze Zhang | 2014 | Communications in Computational Physics2014，16，6： | 0 |
| 5 | Numerical Investigation of the Dynamics of a Flexible Filament in the Wake of Cylinder显示文摘Fluid-structure-interaction problems are ubiquitous,complicated,and not yet well understood.In this paper we investigate the interaction of a leading rigid circular cylinder and a trailing compliant filament and analyze the dynamic responses of the filament in the wake of the cylinder.It is revealed that there exist two flapping states of the filament depending on the cylinder-filament separation distance and the relevant critical distance distinguishing the two states is associated with the Reynolds number and the filament length.It is also found that the drag coefficient of the cylinder is reduced but that of the filament may be increased or decreased depending on its length.Compared with a single filament in a uniform flow,the filament of the same mechanical properties flapping in the wake of the cylinder has a lower frequency and a greater amplitude. | Ru-Nan Hua Luoding Zhu Xi-Yun Lu | 2014 | Advances in Applied Mathematics and Mechanics2014，6，4： | 0 |
| 6 | A three-dimensional immersed boundary method for non-Newtonian fluids显示文摘Fluid-structure-interaction(FSI)phenomenon is common in science and engineering.The fluid involved in an FSI problem may be non-Newtonian such as blood.A popular framework for FSI problems is Peskin’s immersed boundary(IB)method.However,most of the IB formulations are based on Newtonian fluids.In this letter,we report an extension of the IB framework to FSI involving Oldroyd-B and FENE-P fluids in three dimensions using the lattice Boltzmann approach.The new method is tested on two FSI model problems.Numerical experiments show that the method is conditionally stable and convergent with the first order of accuracy. | Luoding Zhu | 2018 | Theoretical & Applied Mechanics Letters2018，8，3： | 0 |
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