Evaluation of Time and Space Scales in a Spatially Developing 3D Turbulent Incompressible Mixing Layer by Using LES
CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE ORSAY (FRANCE) LAB D'INF POUR LA MECHANIQUE/SCIENCES L'ING
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The spatial development of a 3D turbulent incompressible mixing layer is computed by using Large Eddy Simulation LES. The time and space fluctuations of velocity components lead to the energy spectra. We can then to highlight the characteristic scales in both time and space. The energy spectra in time are in agreement with the turbulence theory and show two significant dimensionless frequencies the largest one encountered for all the variables corresponds to the creation of main rolls. On the energy spectra in space, we can observe also two spanwise scales, one of them is found everywhere in the flow while the other one is representative of the phenomena inside the mixing zone.
- Fluid Mechanics