... of line sections in the turbulence model P = dimensionless parameter P a = pressure at the upstream end of the line (N/m 2 ) P a i = pressure at the upstream end of the i th line segment, (N/m 2 ) P b = pressure at the downstream end...

...) 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...

... a cylinder. Computational fluid dynamics Duct LES Pressure drop Turbulence Turbulence modeling Unsteady flows Vortices Channel Pipe flows 26 11 2017 23 05 2018 Contributed by the Fluids Engineering Division of ASME for publication in the J OURNAL OF F LUIDS E...

... fluid dynamics RANS simulations Rotating fluids Turbulence Turbulence modeling Unsteady flows Vortices Wakes Boundary layer flows over three-dimensional (3D) curved bodies such as an axisymmetric hill are of interest to the computational fluid dynamics (CFD) community due...

...) turbulence models can be used to simulate the twin jet behavior with reasonable success for design and analysis activities. The M4 mesh was used with the EBRSM model and the usage is explained in the Results section. It is worth noting that the EBRSM model was not able to reach the same convergence...

... 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...

... . 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 Partially‐averaged Navier–Stokes...

... 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 (MAV). Laminar separated-induced transition takes place since viscous forces are dominant...

... 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...

..., 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...

... – 266 . [63] Lee , J. H. , 2015 , “ Turbulent Boundary Layer Flow With a Step Change From Smooth to Rough Surface ,” Int. J. Heat Fluid Flow , 54 , pp. 39 – 54 . 10.1016/j.ijheatfluidflow.2015.05.001 Boundary layers Turbulence Turbulence modeling The traditional inner wall...

... in the turbulence model P = dimensionless parameter P a = pressure at the upstream end of line ( N / m 2 ) P a i = pressure upstream of the i th line segment ( N / m 2 ) P b = pressure at the downstream end...

...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...

..., 2017. Assoc. Editor: Moran Wang. 30 04 2017 08 08 2017 Fluid-structure interaction Jets Lift Turbulence modeling Unsteady flows Fig. 8 Impact of grid resolution on the drag coefficient for AFC case Δ y + values were well below 1.0 over...

... Computational fluid dynamics Experimental techniques Hydrodynamics Measurement techniques Pressure drop Pumps Rotating fluids Turbulence modeling Unsteady flows Vortices Wakes Fluid mechanics Turbomachines Hydropower plays a vital role to maintain stable and uninterrupted operation...

... 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...

... of entropy noise generated by the two turbulence models. The experimental investigation of entropy noise was performed by generating uniform and nonuniform EOTDF temperature profiles with the same mean area-averaged temperature. The numerical procedure was repeated for LES and URANS for the two temperature...