... ′ ¯ / U 2 ) at the center height of the collection device. Large turbulent stresses occurred in the region of separation flows from the wooden frame for both 0 deg and 45 deg. This corresponds to the phenomenon that the turbulence intensity is greatest around the edge in the net structure [ 23...

... by the Applied Mechanics Division of ASME for publication in the J ournal of A pplied M echanics . 10 11 2020 18 12 2020 18 12 2020 07 01 2021 postbuckled structures free vibration thin film viscoelasticity dynamics turbulence structures vibration Taking advantage...

... [18] Zhu , Q. , and Yan , J. , 2019 , “ A Moving-Domain CFD Solver in Fenics With Applications to Tidal Turbine Simulations in Turbulent Flows ,” Comput. Math. Appl. in press. [19] Clarke , J. A. , Connor , G. , Grant , A. D. , and Johnstone , C. M. , 2007...

...Y. Bazilevs; J. Yan; M. de Stadler; S. Sarkar Fig. 14 Mean velocity streamlines on a planar cut. Top: uniform inflow. Bottom: turbulent inflow. Fig. 18 RMS of the velocity fluctuations in the sphere wake. Left: streamwise velocity fluctuations. Right: radial velocity fluctuations...

... turbulence closure models. Two part-load operating conditions with same head and different flow rates (91% and 70% of the best efficiency point (BEP) flow rate) are considered. Steady and unsteady simulations are carried out for axisymmetric and three-dimensional grid in a simplified axisymmetric geometry...

.... Furthermore, reduction (by about 1/3 in the case with 70% of BEP flow rate) of strong pressure fluctuations leads to reliable operation of the turbine. Hydraulics Internal flow Turbulence The flow in draft tube of a Francis turbine operating at partial load is a complex hydrodynamic phenomenon...

... the asymmetrical flow and also detect the recirculation zones and the differences between the cases of the flow. 27 10 2010 11 03 2012 29 03 2012 28 06 2012 29 06 2012 turbulence large eddy simulation WALE eddy viscosity ORACLES configuration CFD Very common...

...-rectifying turbine in the sense that it maintains the same direction of rotation as the airflow changes direction. The blades of the turbine are symmetrical, and here we consider straight and swept blades, both with constant chord. The turbulent flow physics involved in the complex, unsteady flow is governed...

...-Uniform Rational B-splines) basis functions which have been proven to be highly accurate in LES of turbulent flows (Bazilevs, Y., et al. 2007, Comput. Methods Appl. Mech. Eng., 197 , pp. 173–201). LC consists of stream-wise vortices in the direction of the wind acting as a secondary flow structure...

... with big space coherence. In the opposite, the results obtained with the fine pore plate show a flow close to a fully developed turbulent channel flow. The comparison of the aerodynamic field with computational simulations based on a Reynolds-averaged Navier-Stokes (RANS) model underlines the difficulties...

... phase effects and using two-way coupling method, simulation accuracy noticeably has been improved. Three models, the k − ε model, the Reynolds stress model (RSM) without considering air core, and Reynolds stress turbulence model with volume of fluid multiphase model for simulating air core, were...

...Rafik Absi The semitheoretical function of Nezu and Nakagawa (1993, Turbulence in Open-Channel Flows, A. A. Balkema, ed., Rotterdam, The Netherlands) for the turbulent kinetic energy k is valid only where local equilibrium is a good approximation. From an estimation of the difference between...

..., surface pressure distributions, and streamline plots are calculated for circular, plane, and annular impinging jets. The models show excellent agreement with existing experimental results in both laminar and turbulent conditions and for different Reynolds numbers. Derivation . First, using Eq. 16...

...L. G. Margolin; P. K. Smolarkiewicz; A. A. Wyszogradzki We describe a series of computational experiments that employ nonoscillatory finite volume methods to simulate the decay of high Reynolds number turbulence. These experiments cover a broad range of physical viscosities and numerical...

... turbulence to SGS portion. Thus the procedure is applied to the production term in the transport equation of K SGS , while the eddy viscosity in the filtered equation of motion is determined indirectly through K SGS . The statistically derived model for K SGS equation is adopted for the basis of our...

... against experiment for methane-air combustion in a coaxial geometry, and jet-A surrogate/air combustion in a gas-turbine combustor geometry. 15 12 2003 09 11 2005 flow simulation chemically reactive flow turbulence combustion flames heat transfer gas turbines Mach number jets...

...Sharath S. Girimaji; Eunhwan Jeong; Ravi Srinivasan Hybrid/bridging models that combine the advantages of Reynolds averaged Navier Stokes (RANS) method and large-eddy simulations are being increasingly used for simulating turbulent flows with large-scale unsteadiness. The objective is to obtain...

...Sharath S. Girimaji A turbulence bridging method purported for any filter-width or scale resolution—fully averaged to completely resolved—is developed. The method is given the name partially averaged Navier-Stokes (PANS) method. In PANS, the model filter width (extent of partial averaging...

... and the spatial gradients of the flow field decrease in time. This late stage of Richtmyer-Meshkov mixing layers is studied from the viewpoint of self-similarity. Analogies with weakly anisotropic turbulence suggest that both the bubble-side and spike-side widths of the mixing layer should evolve as power-laws...

... is modeled based on scaling laws. The resulting generalized two-equation turbulence model is validated for several benchmark turbulent flows with swirl and curvature. b ( b i j ) anisotropy of Reynolds stress tensor C , C * modeling coefficients C 1...