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Unformatted text preview: ENU 4133 Turbulence Part 2a March 19, 2010 Turbulence Coverage I Time Averaging I Reynolds Decomposition and RANS (Reynolds Averaged NavierStokes) I Law of the Wall and Velocity Profiles I Kolmogorov hypotheses and scales I Mixing length modeling of turbulence I Multiequation models of turbulence ( k , k ) 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. View of Turbulence Fluctuations vs. Eddies Most formal treatments of turbulence deal with fluctuations in the flow, such as the graphs shown in Part 1 of the turbulence notes. It is possible to use typical statistical techniques on single points (probability distribution functions, etc.) and multiple points or velocity components at the same point (auto/crosscorrelation, etc.). Conceptually, it is easier to understand turbulence as many smallscale fluid rotations (eddies) superimposed on top of one another and on top of the mean flow. The entire flow must satisfy NS everywhere, but each individual structure does not need to.NS everywhere, but each individual structure does not need to....
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This note was uploaded on 07/14/2011 for the course ENU 4133 taught by Professor Schubring during the Spring '11 term at University of Florida.
 Spring '11
 Schubring

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