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In this chapter we present characteristics of turbulent flows in general and see how a turbulent flow is so much different from laminar flow. We briefly refer to some engineering applications where turbulent fluid flow and heat transfer are encountered. We study how an already complex turbulent flow becomes much more complex due to some features such as the presence of a wall and buoyancy. We also characterize turbulent flows. We present the need to numerically study turbulent fluid flows and heat transfer and consequently what is the job of a turbulence model.
KeywordsTurbulence Kinetic Energy Turbulence Model Direct Numerical Simulation Solid Wall Viscous Sublayer
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