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Simulation of incompressible viscous flows around moving objects by a variant of immersed boundary-Lattice Boltzmann method

Wu, J. and Shu, C. and Zhang, Y.H. (2010) Simulation of incompressible viscous flows around moving objects by a variant of immersed boundary-Lattice Boltzmann method. International Journal of Numerical Methods for Heat and Fluid Flow, 62 (3). pp. 327-354. ISSN 0961-5539

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A variant of immersed boundary-lattice Boltzmann method (IB-LBM) is presented in this paper to simulate incompressible viscous flows around moving objects. As compared with the conventional IB-LBM where the force density is computed explicitly by Hook's law or the direct forcing method and the non-slip condition is only approximately satisfied, in the present work, the force density term is considered as the velocity correction which is determined by enforcing the non-slip condition at the boundary. The lift and drag forces on the moving object can be easily calculated via the velocity correction on the boundary points. The capability of the present method for moving objects is well demonstrated through its application to simulate flows around a moving circular cylinder, a rotationally oscillating cylinder, and an elliptic flapping wing. Furthermore, the simulation of flows around a flapping flexible airfoil is carried out to exhibit the ability of the present method for implementing the elastic boundary condition. It was found that under certain conditions, the flapping flexible airfoil can generate larger propulsive force than the flapping rigid airfoil.

Item type: Article
ID code: 16707
Keywords: immersed boundary method, lattice boltzmann method, moving objects, incompressible flow, velocity correction, non-slip condition, lagrangian-eulerian method, navier-stokes equations, Cartesian grid method, circular cylinder, fluid flows, numerical simulation, Mechanical engineering and machinery, Mechanics of Materials, Mechanical Engineering, Applied Mathematics, Computer Science Applications
Subjects: Technology > Mechanical engineering and machinery
Department: Faculty of Engineering > Mechanical and Aerospace Engineering
Faculty of Science > Strathclyde Institute of Pharmacy and Biomedical Sciences
Depositing user: Ms Katrina May
Date Deposited: 29 Mar 2010 14:02
Last modified: 05 Jan 2016 18:49
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