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Turbulence_Part_Two_b_web

Turbulence_Part_Two_b_web - ENU 4133 – Turbulence –...

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Unformatted text preview: ENU 4133 – Turbulence – Part 2b March 19, 2010 Turbulence Coverage I Time Averaging I Reynolds Decomposition and RANS (Reynolds Averaged Navier-Stokes) I Law of the Wall and Velocity Profiles I Kolmogorov hypotheses and scales I Mixing length modeling of turbulence I Multi-equation models of turbulence ( k- , k- ω ) I Computational techniques for turbulence (including large eddy simulation – LES & direct numerical simulation – DNS) In general – Part 1 is more basic, quantitative, and rather closely parallels Section 6.5 in the text. Part 2 is more complex, qualitative, and will be driven from the notes & references. Multi-Equation Models of Turbulence Mixing length models are inadequate for many purposes: I Do not always provide accurate estimates of mean flow. I Generally provide no explicit information regarding fluctuations (the actual turbulence). It is usual to add additional turbulence transport equations to the models to alleviate these deficiencies. The most common numbermodels to alleviate these deficiencies....
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Turbulence_Part_Two_b_web - ENU 4133 – Turbulence –...

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