Property of seamless immersed boundary method for large eddy simulation of incompressible turbulent flows

Journal of Fluid Science and Technology

Mitsuru TANAKA¹  Hidetoshi NISHIDA¹  Kyohei TAJIRI¹ 

[1] Department of Mechanical and System Engineering, Kyoto Institute of Technology;

关键词: computational fluid dynamics;    computational method;    immersed boundary method;    turbulent flow;    large eddy simulation;   

DOI  :  10.1299/jfst.2014jfst0020

来源: DOAJ

【 摘 要 】

In this paper, the simulations of incompressible turbulent flow are presented by applying the seamless immersed boundary method (SIBM) to the large eddy simulation (LES) on the Cartesian grid. The static Smagorinsky model with the wall damping function is adopted as modeling the subgrid-scale (SGS) component in the present approach. In order to validate the SIBM for LES, the turbulent channel flow which is one of the most fundamental wall turbulent flow is considered with Reτ = 180 defined by the friction velocity. In comparison with the reference DNS and LES data, the present result is closer to the DNS data than the LES one. Moreover, the present SIBM results are in good agreement with the results of conventional approach with wall boundary condition. Secondly, the numerical simulations of flow around a sphere which is a basic shape with curvilinear boundary are carried out with the Reynolds number Re = 3700 and 10000 where the flow around a sphere is the turbulent flow. As a result, it is found that the present results are in very good agreement with the reference LES ones with the dynamic SGS model. Then, it is concluded that the present SIBM is very promising for the LES of incompressible turbulent flows.

【 授权许可】

Unknown