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The Influence of advection schemes and Turbulence Closure Models on Drag Coefficient Calculation Around a Circular Cylinder at High Reynolds Number

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Journal of Ocean University of China 2011年第3期10卷 229-233页

作者： LIN Zhenhua ZHAO Dongliang SONG Jinbao College of Physical and Environment Oceanography Ocean University of China Qingdao 266100 P. R. China Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 P. R. China Key Laboratory of Ocean Circulation and Waves Chinese Academy of Sciences Qingdao 266071 P. R. China

Different advection schemes and two-equation turbulence closure models based on eddy viscosity concept are used to compute the drag coefficient around a circular cylinder at high Reynolds number (106).The numerical results from these simulations are compared with each other and with experimental data in order to evaluate the performance of different combinations of advection scheme and two-equation turbulence *** separate contributions from form drag and friction drag are also *** computational results show that the widely used standard k-ε turbulence closure is not suitable for such kind of study,while the other two-equation turbulence closure models produce acceptable *** influence of the different advection schemes on the final results are small compared to that produced by the choice of turbulence closure method. The present study serves as a reference for the choice of advection schemes and turbulence closure models for more complex numerical simulation of the flow around a circular cylinder at high Reynolds number.

关键词： circular cylinder advection schemes turbulence models drag coefficient

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AN UNSPLIT LAGRANGIAN advection SCHEME FOR VOLUME OF FLUID METHOD

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Journal of Hydrodynamics 2010年第1期22卷 73-80页

作者： YANG Wei LIU Shu-hong WU Yu-lin Laboratory of Hydraulic Science and Engineering Tsinghua University Beijing 100084 China

An Unsplit Lagrangian advection （ULA） scheme for Volume Of Fluid （VOF） method is presented in this article. The ULA scheme is developed based on an algorithm of Piecewise Linear Interface Construction （PLIC）. The volume fluxes between cells are calculated through solving the new equation of the linear interfaces in cells in the ULA scheme. The fluxes flowing out from one cell is the inflow fluxes for another cell. In this way the whole fluid volume is conserved strictly without using any redistribution algorithms. The ULA scheme is based on two-dimensional structured rectangular mesh and may be extended to three-dimensional structured mesh with more geometrical efforts. The results from three widely-used benchmark tests show that the ULA scheme can achieve the accuracy higher than Split Lagaragian advection （SLA） scheme and the Flux-Corrected Transport （FCT） algorithm.

关键词： advection schemes free surfaces fluid interfaces Volume Of Fluid (VOF) method

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