A Modified Form of the k-ε Model for Predicting Wall Turbulence

Lam, C. K.; Bremhorst, K.

doi:10.1115/1.3240815

Cited by 838 publications

(264 citation statements)

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“…It is worth pointing out that here the functions f 1 and f 2 have been evaluated according to Lam and Bremhorst [1981] in the case of smooth wall:…”

Section: Faraci Et Al: Waves Plus Currents At Right Anglementioning

confidence: 99%

Waves plus currents at a right angle: The rippled bed case

2008

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[1] The present paper deals with wave plus current flow over a fixed rippled bed. More precisely, modifications of the current profiles due to the superimposition of orthogonal cylindrical waves have been investigated experimentally. Since the experimental setup permitted only the wave dominated regime to be investigated (i.e., the regime where orbital velocity is larger than current velocity), also a numerical k-e turbulence closure model has been developed in order to study a wider range of parameters, thus including the current dominated regime (i.e., where current velocity is larger than wave orbital one). In both cases a different response with respect to the flat bed case has been found. Indeed, in the flat bed case laminar wave boundary layers in a wave dominated regime induce a decrease in bottom shear stresses, while the presence of a rippled bed behaves as a macroroughness, which causes the wave boundary layer to become turbulent and therefore the current velocity near the bottom to be smaller than the one in the case of current only, with a consequent increase in the current bottom roughness.

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“…It is worth pointing out that here the functions f 1 and f 2 have been evaluated according to Lam and Bremhorst [1981] in the case of smooth wall:…”

Section: Faraci Et Al: Waves Plus Currents At Right Anglementioning

confidence: 99%

Waves plus currents at a right angle: The rippled bed case

2008

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“…Choi and Chen [2] gave calculation method for the solution of RANS equation, together with k-ε turbulence model. Sarkar et al [3] used a low-Re k-ε model of Lam and Bremhorst [4] for simulation of flow past underwater axisymmetric bodies.…”

Section: Introductionmentioning

confidence: 99%

Computation of Axisymmetric Turbulent Viscous Flow Around Sphere

Karim

Rahman²,

Алим

2009

J. Sci. Res.

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Axisymmetric turbulent viscous flow around sphere is computed using finite volume method based on Reynolds-averaged Navier-Stokes (RANS) equations. Two-dimensional axisymmetric flow solver has been used to analyze flow at Reynolds number of 5×10 6 . Spalart-Allmaras (S-A) and shear stress transport (SST) k-ω turbulence models are used to capture turbulent viscous flow. The numerical results in terms of the skin friction coefficient, pressure coefficient and drag coefficient at that Reynolds number have been shown either graphically or in the tabular form and velocity vectors have been displayed graphically. The computed results show good agreement with published experimental measurements.

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“…The modified k-ε turbulence model with damping functions proposed by Lam and Bremhorst [11] describes laminar, turbulent, and transitional flows of homogeneous fluids consisting of the following turbulence conservation laws as given in equation …”

Section: Methodsmentioning

confidence: 99%

Farklı Uç Şeklindeki Mermiler için Hız Dağılımı ve Türbülans Enerjisinin Araştırılması

Doğru¹

2017

Çukurova Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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Velocity distribution on the projectile is a critical specification in terms of the range and perforation concept of the projectile. The shape of the projectile affects the amount of perforation energy. In this study, velocity distribution and turbulence energy are investigated for the projectiles on different tip shapes by using Solidworks Flow Simulation. Three different projectile nose shapes are examined in this study (sharpen, semi-rounded and rounded). Initial velocity is accepted to be 500 m/s for all situations. It is determined that the velocity is less affected on the sharpen type projectile where the penetration becomes easier. At the end of this study, velocity and pressure distribution on the penetrators in different tip geometries are obtained. The maximum velocity decrease at the tip of penetrator is found to be as 57.5% for the rounded type projectile. When the results are investigated, it is clear that velocity loss is about 22.2% in sharp type projectile.Keywords: Velocity distribution, Turbulent energy, Projectile, Flow simulation, Tip geometry Farklı Uç Şeklindeki Mermiler için Hız Dağılımı ve Türbülans Enerjisinin Araştırılması ÖzMermi üzerindeki hız dağılımı, merminin menzili ve delip geçme konsepti açısından kritik bir spesifikasyondur. Merminin şekli, delinme enerjisinin miktarını etkilemektedir. Bu çalışmada Solidworks akış simülasyon programı kullanılarak, farklı uç şekillerindeki mermiler için hız dağılımı ve türbülans enerjisi araştırılmıştır. Bu çalışmada üç farklı mermi uç şekli incelenmiştir. (Keskin, Yarı yuvarlatılmış, Yuvarlatılmış). Başlangıç hızı tüm durumlar için 500 m/s olarak kabul edilmiştir. Delip geçmenin daha kolay hale geldiği keskin uçlu mermilerin hızdan daha az etkilendiği tespit edilmiştir. Bu çalışmanın sonucunda farklı uç geometrilerine sahip mermiler üzerindeki hız ve basınç dağılımı elde edilmiştir. Mermi ucundaki en fazla hız düşüşü yuvarlatılmış mermi için %57,5 olarak bulunmuştur. Sonuçlar incelendiğinde, hız kaybının keskin tipli mermilerde ve yaklaşık %22,2 olarak bulunduğu açıkça görülmektedir.

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A Modified Form of the k-ε Model for Predicting Wall Turbulence

Cited by 838 publications

References 0 publications

Waves plus currents at a right angle: The rippled bed case

Waves plus currents at a right angle: The rippled bed case

Computation of Axisymmetric Turbulent Viscous Flow Around Sphere

Farklı Uç Şeklindeki Mermiler için Hız Dağılımı ve Türbülans Enerjisinin Araştırılması

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