Abstract
This chapter presents important issues that one needs to consider in order to perform direct numerical simulation (DNS) and large eddy simulation (LES) of turbulent flows. We also present important similarities and differences between DNS and LES. We show that DNS though potentially a powerful tool cannot be used as a design tool for engineering applications and show LES has a good potential as a design tool. We present different subgrid scale models that can be used to perform LES with the advantages and disadvantages of each one. We present challenges in performing LES and DNS especially in the presence of wall and in applications dealing with convective heat transfer. Different ways of treating a solid wall by using suitable models in LES are also presented in this chapter.
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