Computational Fluid Dynamics Laboratory
Turbulent Inlet Conditions
A study has been performed which investigates the effect of stochastic
inlet conditions on the development of a fully-turbulent jet. The jet
under consideration has a Reynolds number of 21,000, to match the
experimental jet of Amielh et al. (1996). Both Gaussian random
fluctuations and a Spectral Representation of turbulence were tested as
stochastic representations of inlet turbulence. It was found that
Gaussian random fluctuations dissipate almost immediately, while the
spectral fluctuations yield sustaining structures that develop rapidly
into real turbulence. Please see the following reference for details
of this work.
Glaze, David J. and Frankel, Steven H., "Stochastic Inlet Conditions for
Large-Eddy Simulation of a Fully Turbulent Jet," AIAA Journal,
41(6):1064-1073, 2003.
Below is an animation of mixture fraction in a slice through the centerline
of a jet using the Spectral Representation inlet conditions.
Below is an animation of an isosurface of mixture fraction (Z=0.05)
in a turbulent jet, colored by the mixture fraction dissipation rate.
The bottom and back walls show mixture fraction and dissipation rate,
respectively, in slices through the jet centerline.
Below is an animation of turbulent structures in a turbulent jet,
along with a slice of mixture fraction and velocity vectors through
the jet centerline.
Prof. Frankel's MAIN PAGE