Open Access
A new time scale based k-epsilon model for near wall turbulence
Z. Yang,T. H. Shih +1 more
- 01 Sep 1992
Vol. 92, pp 32868
TL;DR: In this article, a k-epsilon model for wall bonded turbulent flows is proposed and the damping function used in the eddy viscosity is chosen to be a function of R(sub y) = (k(sup 1/2)y)/v instead of y(+).
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Abstract: A k-epsilon model is proposed for wall bonded turbulent flows. In this model, the eddy viscosity is characterized by a turbulent velocity scale and a turbulent time scale. The time scale is bounded from below by the Kolmogorov time scale. The dissipation equation is reformulated using this time scale and no singularity exists at the wall. The damping function used in the eddy viscosity is chosen to be a function of R(sub y) = (k(sup 1/2)y)/v instead of y(+). Hence, the model could be used for flows with separation. The model constants used are the same as in the high Reynolds number standard k-epsilon model. Thus, the proposed model will be also suitable for flows far from the wall. Turbulent channel flows at different Reynolds numbers and turbulent boundary layer flows with and without pressure gradient are calculated. Results show that the model predictions are in good agreement with direct numerical simulation and experimental data.
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Citations
Near-Wall Modeling of Plane Turbulent Wall Jets
G. Gerodimos,Ronald M. C. So +1 more
TL;DR: In this article, the authors investigated the appropriateness of two-equation modeling; particularly the importance of near-wall modeling and the validity of the equilibrium turbulence assumption and compared with recent measurements of plane wall jets.
47
Latest development on computational approaches for nanofluid flow modeling: Navier–Stokes based multiphase models
Nor Azwadi Che Sidik,Muhammad Noor Afiq Witri Muhammad Yazid,Syahrullail Samion,Mohamad Nor Musa,Rizalman Mamat +4 more
TL;DR: In this paper, the authors present a review of various computational approaches to predict fluid flow and heat transfer characteristics of nanofluids, including single-phase and two-phase approaches.
46
Fluid dynamics in starting and terminating transients of zero-secondary flow ejector
TL;DR: In this article, the starting transient and plume blowback at diffuser breakdown of a straight cylindrical supersonic exhaust diffuser with no externally supplied secondary flow are numerically investigated.
45
Turbulent natural convection between inclined isothermal plates
TL;DR: In this article, the authors investigated the stability of turbulent natural convection between inclined isothermal plates and found that the channel overall average Nusselt number is reduced, the rate of reduction increases as the inclination angle is increased and that the overall average number at different inclination angles can be presented by a single correlation if plotted versus the product of the modified Rayleigh number and (Cos θ) 0.5.
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Wall friction and turbulence dynamics in decelerating pipe flows
TL;DR: In this article, the wall shear stresses in decelerating pipe flows are studied using a well-established CFD code developed specifically for modelling unsteady turbulent flows, and the suitability of the turbulence model used was demonstrated previously and re-confirmed by comparison with recent experimental data.
44
References
•Book
Numerical heat transfer and fluid flow
Suhas V. Patankar
- 01 Jan 1980
TL;DR: In this article, the authors focus on heat and mass transfer, fluid flow, chemical reaction, and other related processes that occur in engineering equipment, the natural environment, and living organisms.
23.4K
The numerical computation of turbulent flows
Brian Launder,D. B. Spalding +1 more
TL;DR: In this paper, the authors present a review of the applicability and applicability of numerical predictions of turbulent flow, and advocate that computational economy, range of applicability, and physical realism are best served by turbulence models in which the magnitudes of two turbulence quantities, the turbulence kinetic energy k and its dissipation rate ϵ, are calculated from transport equations solved simultaneously with those governing the mean flow behaviour.
13.1K
•Book
Computational Fluid Mechanics and Heat Transfer
Dale Anderson,John C. Tannehill,Richard H. Pletcher +2 more
- 01 Jan 1984
TL;DR: In this paper, a reference record was created on 2005-11-18, modified on 2016-08-08 and used for CFD-based transfert de chaleur.
4K
Reassessment of the scale-determining equation for advanced turbulence models
TL;DR: In this paper, a two-equation turbulence model is proposed that is shown to be quite accurate for attached boundary layers in adverse pressure gradient, compressible boundary layers, and free shear flows.
3.2K
•Book
Turbulence Models and Their Application in Hydraulics
Wolfgang Rodi
- 01 Jan 1993
TL;DR: In this article, the authors provide an introduction to the subject of turbulence modelling in a form easy to understand for anybody with a basic background in fluid mechanics, and summarize the present state of the art.
2.3K