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grid convergence Property of Three-Dimensional Measurement-Integrated Simulation for Unsteady Flow behind a Square Cylinder with Karman Vortex Street

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Journal of Flow Control, Measurement & Visualization 2016年第4期4卷 125-142页

作者： Takayuki Yamagata Toshiyuki Hayase Visualization Research Center Niigata University Niigata Japan Institute of Fluid Science Tohoku University Aoba-ku Sendai Japan

The purpose of this study was to clarify grid convergence property of three-dimensional measurement-integrated (3D-MI) simulation for a flow behind a square cylinder with Karman vortex street. Measurement-integrated (MI) simulation is a kind of the observer in the dynamical system theory by using CFD scheme as a mathematical model of the system. In a former study, two-dimensional MI (2D-MI) simulation with a coarse grid system showed a fairly good result in comparison with a 2D ordinary (2D-O) simulation, but the results were degraded with grid refinement. In this study, 3D-MI simulation and three-dimensional ordinary (3D-O) simulation were performed with three grid systems of different grid resolutions, and their grid convergence properties were compared. As a result, all 3D-MI simulations reproduced the vortex shedding frequency identical to that of the experiment, and the flow fields obtained were very close, within 5% difference between the results, while the results of the 3D-O simulations showed variation of the solution under convergence. It is shown that the grid convergence property of 3D-MI simulation is monotonic and better than that of 3D-O simulation, whereas those of 2D-O and 2D-MI simulations for streamwise velocity fluctuation are divergent. The solution of 3D-MI simulation with a relatively coarse grid system properly reproduces the basic three-dimensional structure of the wake flow as well as the drag and lift coefficients.

关键词： Measurement-Integrated Simulation grid convergence Square Cylinder Flow Measurement Numerical Simulation Pressure Measurement Flow Observer Karman Vortex

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基于STAR-CCM+的船体周围流体流动数值分析及验证结果

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哈尔滨工程大学学报（英文版） 2024年第2期23卷 276-291页

作者： Doyal Kumar Sarker MdShahjada Tarafder Bangladesh University of Engineering and Technology-Naval Architecture and Marine Engineering BUETDhaka-1000 Dhaka 1000Bangladesh

In this paper,numerical analyses of fluid flow around the ship hulls such as Series 60,the Kriso Container Ship(KCS),and catamaran advancing in calm water,are presented.A commercial computational fluid dynamic(CFD)code,STAR-CCM+is used to analyze total resistance,sinkage,trim,wave profile,and wave pattern for a range of Froude *** governing RANS equations of fluid flow are discretized using the finite volume method(FVM),and the pressure-velocity coupling equations are solved using the SIMPLE(semi-implicit method for pressure linked equations)*** of fluid(VOF)method is employed to capture the interface between air and water phases.A fine discretization is performed in between these two phases to get a higher mesh *** fluid-structure interaction(FSI)is modeled with the dynamic fluid-body interaction(DFBI)module within the STAR-CCM+.The numerical results are verified using the results available in the *** convergence studies are also carried out to determine the dependence of results on the grid *** comparison to previous findings,the current CFD analysis shows the satisfactory results.

关键词： Computational fluid dynamics grid convergence Resistance STAR-CCM+ Volume of fluid

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