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R.P. LeBeau (University of Kentucky), T.E. Dowling (CPL/University of Louisville)
Since its introduction in 1997, the Detached Eddy Simulation (DES) turbulence model has been used successfully to simulate turbulence in an increasing number of computational fluid dynamics applications, primarily in aerospace engineering. The characteristics of DES—its compatibility with eddy viscosity models and its ability to smoothly transit from a Reynolds-Averaged Navier-Stokes (RANS) to a Large Eddy Simulation (LES) turbulence model—make it attractive as a potential turbulence model for atmospheric simulation. The current implementation of the model within the EPIC GCM is designed to provide turbulence closure from the planetary boundary layer to the upper atmosphere.
We will present validation studies based on well-studied engineering and geophysical benchmark flows to examine the effects of DES model type (the Spalart-Allmaras or Menter SST version), boundary condition construction, coriolis forces, and problem scale. These validation tests are used to correct and calibrate the model, an iterative process that provides a more quantitative check of the DES techniques. Our main goal is to constrain a versatile planetary boundary-layer formulation using the full spectrum of available engineering data such that it provides good accuracy for a wide range of planetary applications, including Venus, Earth, Mars, Titan, and Triton.
This work is sponsored by the NASA EPSCoR and Planetary Atmospheres Programs and the Kentucky Space Grant Consortium.
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Bulletin of the American Astronomical Society, 36 #4
© 2004. The American Astronomical Soceity.