Akademik Veri Yönetim Sistemi
Proceedings of the 1999 3rd ASME/JSME Joint Fluids Engineering Conference, FEDSM'99, San Francisco, California, USA, 18-23 July 1999 (CD-ROM), ss.1, 1999 (Scopus)
Large Eddy Simulation (LES) is becoming a well established method for simulating turbulent flows in a variety of idealized flow situations. Due to the advances in computational power and cost it is becoming more practical to use LES to model turbulent fluid flow for more realistic engineering situations. There is therefore some complex flow problems to resolve. These can include flow around bluff bodies, flows with strong pressure gradients or simply flows in very complex geometry. There is a need to look at the behaviour of the flow in response to changing conditions in near wall regions. This is a neglected area in LES modelling, due possibly to a misguided perception that it is not of particular relevance to most flow situations. This paper will look at Large Eddy Simulations for flow past a bluff body with a variety of different approaches to how to deal with flow at a solid surface. Simulations will use a no wall function approach, a modified LES viscosity at the wall, Tutar et al (1998), and a study of the effect of changing the distance of the first element from the wall when using the approach of Tutar et al (1998). The results will show that it is as important to include realistic wall effects when using LES as with any other turbulence model, Wakes et al (1997). This should be carefully considered as the use of LES becomes more common place for engineering applications.