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Hybrid Methods in Engineering

ISSN 印刷: 1099-2391
ISSN オンライン: 2641-7359

Archives: Volume 1, 1999 to Volume 4, 2002

Hybrid Methods in Engineering

DOI: 10.1615/HybMethEng.v3.i1.20
13 pages

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

E. Ferrero
Dipartimento di Scienze e Tecnologie Avanzate, Università del Piemonte Orientale, Corso T. Borsalino 54, 15100, Alessandria, Italy
S. Trini Castelli
Istituto di Cosmogeofisica del CNR, Corso Fiume4, 10133, Torino, Italy
Domenico Anfossi
Istituto di Cosmogeofisica del CNR, Corso Fiume4, 10133, Torino, Italy
S. Finardi
Arianet s.r.l., VialeElvezia 42, 20052 Monza (MI), Italy
E. Di Lisi
Dipartimento di Fisica Generale, Università di Torino, via Pietro Giuria 1, 10125, Torino, Italy

要約

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.


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