...Ted Ø. S. Gundersen; Erik A. Torbergsen; Boris Balakin; Bjørn J. Arntzen; Alex C. Hoffmann Within turbomachines, turbulence production and redistribution are affected by system rotation and streamline curvature. However, the most frequently used turbulence models do not account for these effects...

... 2018 15 07 2018 Fluid transients Newtonian flows Non-Newtonian flows Turbulence Turbulence modeling Unsteady flows There is an increasing demand to understand the fluid dynamics of transient flow through industrial and biological systems; many of these systems contain non...

...) simulations and considering the change in the pipe cross section (a contraction). Four different contraction angles are selected for the investigations. The unsteady Reynolds-averaged Navier–Stokes (URANS) equations and the low-Reynolds k –ω shear stress transport (SST) turbulence model are used to simulate...

... approaches on the flow field around trains, which affects the surface pressure and consequently the aerodynamic forces of the train, was not properly investigated in terms of their influence flow field. The SST and improved delayed detached eddy simulation (IDDES) turbulence models have been tested...

.... Assoc. Editor: Sergio Pirozzoli. 26 09 2017 28 05 2018 Boundary layers Computational fluid dynamics RANS simulations Rotating fluids Turbulence Turbulence modeling Unsteady flows Vortices Wakes Boundary layer flows over three-dimensional (3D) curved bodies...

... power plants, such as the small modular reactor [ 2 , 3 ]. Ultimately, the design can be classified as a shell and tube heat exchanger with physics that resembles crossflow over a cylinder. Computational fluid dynamics Duct LES Pressure drop Turbulence Turbulence modeling Unsteady flows...

...) turbulence models can be used to simulate the twin jet behavior with reasonable success for design and analysis activities. The experimental uncertainty for the velocity in the streamwise and spanwise directions, and off-diagonal Reynolds stress component ( u ′ v...

... turbulence models should satisfy the following key criteria: Overall, the growth of C f and its variation with TI, growth of near-wall vortical structures, growth of u ′ 2 during transition, and energy redistribution mechanisms confirm that the growth of turbulence in the channel flow...

... – ω were better than those of the shear stress transport (SST) transition. Aerodynamics Computational fluid dynamics Experimental techniques Stability Turbulence modeling Transition Low aspect ratios (AR) wing flows are quite important in terms of aerodynamics of micro-air vehicles...

... OURNAL OF F LUIDS E NGINEERING . Manuscript received August 18, 2017; final manuscript received May 2, 2018; published online June 13, 2018. Assoc. Editor: Jun Chen. 18 08 2017 02 05 2018 Aerodynamics Computational fluid dynamics Drag Turbulence Turbulence modeling Wakes...

... previously obtained by different research groups. The proposed approach has shown a good level of agreement as regards the global and the local experimental fluid dynamic quantities. In addition, sensitivity analyses have been carried out concerning (a) grid independency, (b) turbulence modeling approaches...

... received August 29, 2017; final manuscript received February 19, 2018; published online March 27, 2018. Assoc. Editor: Daniel Livescu. 29 08 2017 19 02 2018 Computational fluid dynamics Turbulence Turbulence modeling Turbulence models are simplified constitutive equations...

... Turbulence modeling The traditional inner wall layer and outer defect layer in wall-bounded turbulent shear flow discovery during 1930 was from Prandtl [ 1 ] and von Karman [ 2 ]. The rational matching of the inner and outer layers for turbulent pipe/channel was described by Izakson [ 3...

..., together with the convective terms, within the differences between fluxes of neighboring computational cells. In order to consider the effect of unsteady friction terms during the water hammer process, k − ε and k − ω turbulence models are employed. The performance of the proposed method with the choice...

... online February 23, 2018. Assoc. Editor: Elias Balaras. 16 12 2016 03 01 2018 Fluid transients Turbulence Turbulence modeling The effects of pressure transients such as water hammer, resulting from rapid acceleration or deceleration of flow in lines such as in fluid power...

...Ashwani Assam; Nikhil Narayan Kalkote; Vatsalya Sharma; Vinayak Eswaran The Spalart–Allmaras (SA) is one of the most popular turbulence models in the aerospace computational fluid dynamics (CFD) community. In its original (low-Reynolds number) formulation, it requires a very tight grid spacing near...

...) simulations using conventional turbulence models. This is because of the constant Prandtl number assumption, which fails in the presence of strong adverse pressure gradient (APG) of the shock waves. Experimental data suggest a reduction of the turbulent Prandtl number in boundary layers subjected to APG. We...

.... , Braza , M. , Hoarau , Y. , and Harran , G. , 2008 , “ Turbulence Modelling of the Flow Past a Pitching NACA0012 Airfoil at 105 and 106 Reynolds Numbers ,” J. Fluids Struct. , 24 ( 8 ), pp. 1294 – 1303 . 10.1016/j.jfluidstructs.2008.08.002 [11] Martinat , G. , Hoarau , Y...

... , Foreign Language Press , Beijing, China . [29] Hanjalic , K. , 2005 , “ Will RANS Survive LES? A View of Perspectives ,” ASME J. Fluids Eng. , 127 ( 5 ), pp. 831 – 839 . 10.1115/1.2037084 [30] Menter , F. R. , 2009 , “ Review of the Shear-Stress Transport Turbulence Model...

... to high pressure gradients do not follow the universal log-law, and (for this and other reasons) the prediction of boundary layer (BL) parameters using current turbulence models has not been successful. However, a quasi-laminar theory (QLT; proposed in 1973), based on a two-layer model to explain...