A modified one-equation turbulence model based on k-equation

M. M. Rahman, R. K. Agarwal, T. Siikonen

Tutkimustuotos: Artikkeli kirjassa/konferenssijulkaisussaConference contributionScientificvertaisarvioitu

2 Sitaatiot (Scopus)

Abstrakti

An approach to reducing the two-equation k-ǫ model to a one-equation model based on the k-equation is proposed to account for the distinct effects of low-Reynolds number (LRN) and wall proximity. The dissipation rate ǫ is evaluated with an algebraically prescribed length scale having only one adjustable coefficient. The stress-intensity ratio Rb = u1u2/k is devised as a function of local variables without resorting to a constant Cμ = 0.3. The key parameter Rb entering the turbulence production Pk prevents presum-ably the overestimation of Pk in flow regions where non-equilibrium effects could result in a misalignment between turbulent stress and mean strain-rate with a linear eddy-viscosity model. An anisotropic function fk is for-mulated to enhance the dissipation in the near-wall region. The Bradshaw-relation Rb and the coefficient of dissipation term are calibrated against the fully developed turbulent channel flow; however they yield good predictions. A comparative assessment of the present model with the Spalart-Allmaras (SA) one-equation model and the shear stress transport (SST) k-ω model is provided for well-documented simple and non-equilibrium turbulent flows.

AlkuperäiskieliEnglanti
Otsikko54th AIAA Aerospace Sciences Meeting
KustantajaAIAA
Sivumäärä19
ISBN (painettu)9781624103933
DOI - pysyväislinkit
TilaJulkaistu - 2016
OKM-julkaisutyyppiA4 Artikkeli konferenssijulkaisuussa
TapahtumaAIAA Aerospace Sciences Meeting - San Diego, Yhdysvallat
Kesto: 4 tammikuuta 20168 tammikuuta 2016
Konferenssinumero: 54

Conference

ConferenceAIAA Aerospace Sciences Meeting
MaaYhdysvallat
KaupunkiSan Diego
Ajanjakso04/01/201608/01/2016

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