Abstract
What is turbulence modeling? Why do we need it? What are the primary types of modeling? These questions are answered directly and concisely in this chapter. In order to credit the giant whose shoulders we sit on, a brief historic account of some eminent pioneering attempts is presented. This should also assist those who are new to the topic in their comprehension of flow turbulence and its modeling. The “closure problem” is conveyed, along with the concepts underlying the renowned zero-order, one-equation, and two-equation models. Readers are walked from the RANS (Reynolds-averaged Navier-Stokes) approach, where all turbulent scales are modeled, through to the DNS (direct numerical simulation), which “explicitly” calculates all scales, from the largest to the smallest. Specialized monographs on turbulence modeling are provided for more accomplished readers to step up to.
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