An explicit algebraic Reynolds stress model in turbulence

Rahman, Mizanur; Siikonen, Timo

doi:10.1002/fld.1222

Cited by 25 publications

(5 citation statements)

References 43 publications

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“…In order to save computational time, an explicit algebraic k-ϵ model of Rahman and Siikonen (2006) is applied to calculate this flow field with the same grid. Afterwards, the LES is initiated from the results of k-ϵ model.…”

Section: Resultsmentioning

confidence: 99%

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Large eddy simulation of a high-pressure homogenizer valve

Taghinia

Rahman

Siikonen

2015

Chemical Engineering Science

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Section: Resultsmentioning

confidence: 99%

“…The formulation for C μ as suggested by Rahman and Siikonen (2006) in an RANS modeling is adapted with the RAST model…”

Section: Rast Sub-grid Scale Modelmentioning

confidence: 99%

Large eddy simulation of a high-pressure homogenizer valve

Taghinia

Rahman

Siikonen

2015

Chemical Engineering Science

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“…It is appropriate to emphasize that the shear and vorticity parameters T t S and T t W, respectively, can assistC μ in responding to both the shear and vorticity dominated flows that are far from equilibrium. Detailed analysis of the model realizability is available elsewhere [15][16][17][18]. The dissipation of turbulent kinetic energy plays a vital role in determining the time scale T t .…”

Section: Modified Nr (Mnr) Modelmentioning

confidence: 99%

Modified Norris–Reynolds One–Equation Model

Rahman

Taghinia

Islam

et al. 2015

Procedia Engineering

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A modified version of Norris-Reynolds (NR) k-equation turbulence model is proposed to account for the distinct effects of lowReynolds number (LRN) and wall proximity. The turbulent kinetic energy k and the dissipation rate are evaluated using the k-transport equation in conjunction with the Bradshaw and other empirical relations. The eddy-viscosity formulation maintains the positivity of normal Reynolds stresses and preserves the anisotropic characteristics of turbulence in the sense that they are sensitized to rotational and non-equilibrium flows. The modified NR (MNR) model is validated against well-documented flow cases yielding predictions in good agreement with the direct numerical simulation (DNS) and experimental data. Comparisons indicate that the MNR model offers some improvement over the original NR model and competitiveness with the Spalart-Allmaras one-equation model.

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“…Detailed analysis of the model realizability is available elsewhere . [14][15][16][17] The formulation of the model coefficients and associated relevant aspects are discussed in some detail in subsequent sections.…”

Section: Turbulence Modelingmentioning

confidence: 99%

An Improved Version of One-Equation RAS Turbulence Model

Rahman

Agarwal

Lampinen

et al. 2015

45th AIAA Fluid Dynamics Conference

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An improved version of a recently developed one-equation turbulence model called RAS (Rahman-Agarwal-Siikonen) is proposed to account for the distinct effects of low-Reynolds number (LRN) and wall proximity. The turbulent kinetic energy k and the dissipation rate ǫ are evaluated using the R = (k 2 /ǫ)-transport equation together with the Bradshaw and other empirical relations. The associated coefficients are constructed such as to preserve the anisotropic characteristics of turbulence encountered in non-equilibrium flows. In the current version, several improvements to the original RAS model are made which include the introduction of a nearwall eddy-viscosity damping function. An anisotropic destruction coefficient is used to obtain a faster decaying behavior of turbulence destruction in the outer region of the boundary/shear layer, thereby precluding the free-stream dependency. The source term in the transport equation is independent of the Reynolds stress tensor. A comparative assessment of the improved RAS model with the Spalart-Allmaras (SA) one-equation model and the shear stress transport (SST) k-ω model is provided for welldocumented non-equilibrium turbulent flows.

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An explicit algebraic Reynolds stress model in turbulence

Cited by 25 publications

References 43 publications

Large eddy simulation of a high-pressure homogenizer valve

Large eddy simulation of a high-pressure homogenizer valve

Modified Norris–Reynolds One–Equation Model

An Improved Version of One-Equation RAS Turbulence Model

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