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Hybrid Methods in Engineering

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ISSN Druckformat: 1099-2391

ISSN Online: 2641-7359

STUDY OF DIFFERENT TURBULENCE CLOSURE MODELS SIMULATING A NEUTRAL WIND TUNNEL FLOW EXPERIMENT

Volumen 3, Ausgabe 1, 2001, 13 pages
DOI: 10.1615/HybMethEng.v3.i1.20
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ABSTRAKT

In this work, three different turbulence closure models, based both on a prognostic transport-diffusion equation and a diagnostic equation, are implemented in the fluid-dynamical model RAMS to simulate a neutral flow in a wind tunnel. The first closure model (E-l) solves the equation for turbulent kinetic energy only, whereas in the second (E-ε) and third (E-ε-l) models both the turbulent kinetic energy equation and the one for its dissipation rate ε are solved. In the E-l model, ε is provided by a diagnostic equation as a function of E and the mixing length l. The E-ε and E-ε-l models differ in the definition of the diffusion coefficient for the momentum Km. E-ε closure prescribes Km by means of the prognostic values of E and ε, whereas the E-ε-l model uses the mixing length concept. Different values for the empirical constants defining the mixing length are adopted. The turbulence models are tested against observed data on flat terrain. An example of application over a two-dimensional valley (U.S. Environmental Protection Agency—RUSVAL experiments) is also shown. Mean wind and turbulent kinetic energy vertical profiles both measured and calculated are shown and compared.

REFERENZIERT VON
  1. Castelli S. Trini, Ferrero E., Anfossi D., Ohba R., Turbulence closure models and their application in RAMS, Environmental Fluid Mechanics, 5, 1-2, 2005. Crossref

  2. Trini Castelli S., Hara T., Ohba R., Tremback C.J., Validation studies of turbulence closure schemes for high resolutions in mesoscale meteorological models, Atmospheric Environment, 40, 14, 2006. Crossref

  3. Ferrero E, Castelli S.Trini, Anfossi D, Turbulence fields for atmospheric dispersion models in horizontally non-homogeneous conditions, Atmospheric Environment, 37, 17, 2003. Crossref

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