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    Topography Modeling in Atmospheric Flows Using the Immersed Boundary Method (2004)
    In:  CASI
    Details
    Publication Date: 2018-06-05
    Description: Numerical simulation of flow over complex geometry needs accurate and efficient computational methods. Different techniques are available to handle complex geometry. The unstructured grid and multi-block body-fitted grid techniques have been widely adopted for complex geometry in engineering applications. In atmospheric applications, terrain fitted single grid techniques have found common use. Although these are very effective techniques, their implementation, coupling with the flow algorithm, and efficient parallelization of the complete method are more involved than a Cartesian grid method. The grid generation can be tedious and one needs to pay special attention in numerics to handle skewed cells for conservation purposes. Researchers have long sought for alternative methods to ease the effort involved in simulating flow over complex geometry.
    Keywords: Numerical Analysis
    Type: Annual Research Briefs, 2004: Center for Turbulence Research; 331-341
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Study of Near-Surface Models in Large-Eddy Simulations of a Neutrally Stratified Atmospheric Boundary Layer (2004)
    In:  CASI
    Details
    Publication Date: 2018-06-02
    Description: Large-eddy simulation (LES) is a widely used technique in armospheric modeling research. In LES, large, unsteady, three dimensional structures are resolved and small structures that are not resolved on the computational grid are modeled. A filtering operation is applied to distinguish between resolved and unresolved scales. We present two near-surface models that have found use in atmospheric modeling. We also suggest a simpler eddy viscosity model that adopts Prandtl's mixing length model (Prandtl 1925) in the vicinity of the surface and blends with the dynamic Smagotinsky model (Germano et al, 1991) away from the surface. We evaluate the performance of these surface models by simulating a neutraly stratified atmospheric boundary layer.
    Keywords: Meteorology and Climatology
    Type: Annual Research Briefs, 2004: Center for Turbulence Research; 343-353
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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