Showing papers in "International Journal of Heat and Fluid Flow in 2020"

TL;DR: In this article, a turbulent channel flow with constant wall temperatures of different values prescribed on the upper and lower walls at Re b = 18000 was investigated in the framework of streamwise-aligned triangular ridges, and two arrangements of the ridges on both channel walls were considered.

TL;DR: In this paper, the authors used ANSYS-Fluent, based on the finite volume method, to simulate two-dimensional Newtonian fluid flow and numerically investigated the wakes of elliptical cylinders at a Reynolds number ReD = 150.

TL;DR: In this article, the authors used spectral proper orthogonal decomposition (SPOD) to identify dominant near-wall coherent structures, most of which turn out to be streaks and streamwise vortices.

TL;DR: In this paper, a conjugate heat transfer (CHT) study of a liquid cooling heat exchanger is carried out using the open source computational fluid dynamics (CFD) library OpenFOAM.

TL;DR: In this article, a large-eddy simulation approach was adopted to solve the flow around a surface-mounted finite-height square prism with an aspect ratio of AR = 3 and a Reynolds number Re = 500.

TL;DR: In this paper, transient numerical simulations of different marshalling lengths (2, 4, and 8-car group trains) were conducted in the open air and without wind, and the results were compared with the results of wind tunnel experiments to verify the feasibility of numerical simulation.

TL;DR: In this article, a large-eddy simulation of two-phase flows, with the air-water interface captured by a coupled level-set and volume-of-fluid method, is used to study the formation and evolution of air-core vortex.

TL;DR: In this article, a series of multi-camera planar particle image velocimetry (PIV) measurements are conducted in a streamwise/spanwise and stream-wise/wall-normal planes at a friction Reynolds number of Reτ ≈ 2500.

TL;DR: In this paper, a detailed numerical analysis of diesel engine spray structure induced by the Engine Combustion Network (ECN) Spray A at different injection pressures is presented with the focus on their impact on spray structure as the injection pressure varies.

TL;DR: In this article, the effect of nanoparticles with pure water as a base fluid on mixed convection with magnetohydrodynamic flow in a vertical channel with two facing identical open cubic cavities with discrete heating was investigated.

TL;DR: A meso-macro hierarchic upscaling scheme is applied to investigate the deformation-dependent intrinsic permeability properties and the Darcy/non-Darcy fluid flow regime and the combined framework proved to stand well between the two approaches.

TL;DR: In this paper, a double-feedback fluidic oscillator was numerically investigated based on three-dimensional unsteady Reynolds-averaged Navier-Stokes equations (3D-URANS) while the operating fluid is an incompressible flow.

TL;DR: In this article, the performance of a one-phase swirling flow multi-nozzle annular jet pump was evaluated using Reynolds-averaged Navier-Stokes simulations and experimental measurements carried out with a bespoke test rig.

TL;DR: In this article, the authors used particle image velocimetry and planar laser induced fluorescence (PLIF) to simultaneously measure the velocity and scalar concentration fields of negatively buoyant jets.

TL;DR: In this article, the flow-induced vibration characteristics and energy extraction performance of flexible inverted piezoelectric flags in a uniform flow are studied by using an immersed boundary-lattice Boltzmann method for Reynolds number of 100, mass ratio of 2.9 and non-dimensional bending stiffness of 0.26 which correspond to the maximum flapping amplitude for a single inverted flag.

TL;DR: In this article, the secondary vortex flows over an oscillating low-pressure turbine blade were investigated using a direct numerical simulation (DNS) method, where the unsteady flow governing equations over the oscillating blade were discretized and solved using a spectral/hp element method.

TL;DR: A modified STRUCT (MST) turbulence model for efficient engineering computations of turbulent flows in hydro-energy machinery is proposed in this article, which switches between URANS and LES-like modes using a new damping function to adjust the turbulent viscosity compared with the original STRUCT method.

TL;DR: In this article, a systematic parameter study is conducted to examine the sensitivity of the mean velocity field in a swirl chamber to changes in the Reynolds number, swirl intensity and channel outlet geometry.

TL;DR: In this paper, an alternative modeling strategy is suggested, which can be used to regularize an arbitrary anisotropic (e.g. scale similarity type) model, which is free of backscatter and provides good stability in LES.

TL;DR: In this article, three surfaces are tested in turbulent boundary layer flow at a friction Reynolds number, Reτ = −1600-2200, and the results show the anticipated trend of increasing skin-friction drag with increasing skewness.

TL;DR: In this article, a finite difference-based front-tracking method was used to study the finite deformation and breakup of an initially concentric compound droplet when it moves toward a rigid wall at the bottom of an axisymmetric vertical channel.

TL;DR: In this paper, the dynamics of a single rising bubble in the vicinity of a vertical wall is explored via three-dimensional numerical simulations, and it is shown that the presence of the wall imposes a repulsion on the bubble and that the bubble migrates away from the wall upon release.

TL;DR: The influence of the choices of inputs-sensors, the size of the training data-set, the number of neurons in the hidden layer as well as the sensor delay on the accuracy of the predicted flow are discussed for this experimental fluid system.

TL;DR: In this paper, the authors investigated the vehicle wake in relation to aerodynamic drag in steady crosswind conditions and used a surrogate model-based optimisation algorithm to minimise the drag coefficient by optimising the angle of each flap individually.

TL;DR: In this article, a combination of the particle image velocimetry and planar laser-induced fluorescence methods was used to evaluate the local transport of the flow momentum and scalar admixture in the near field of turbulent swirling jets.

TL;DR: In this article, an experimental results were presented for the release of diesel oil from a one-inch (25 cm) vertical pipe in a crossflow at 027m/s, where the ratio of jet velocity to crossflow speed was 50 and the Reynolds number based on jet velocity and pipe diameter was 71 × 10 3

TL;DR: In this article, the authors summarized the characteristics of the fluid flow over a confined circular cylinder at low Reynolds numbers and showed that the fluctuating lift forces decreases with blockage ratio and becomes zero (where the flow is steady) at blockage ratios of approximately 0.7-0.8.

TL;DR: In this paper, the particle-laden flow is exposed to near-infrared radiation, and the gas phase temperature statistics are measured along the wall bisector of the duct, and it is found that the instantaneous temperature fluctuations are comparable to the overall mean temperature rise.

TL;DR: In this article, a realistic five-layered helical coil tube bundle in turbulent cross flow is numerically investigated using large eddy simulation (LES), and the results of spectral analyses, including the power spectral density and continuous wavelet transform analyses, are addressed from the perspective of flow-induced vibration.

TL;DR: In this paper, the velocity profiles and wall shear stress values in the wall jet region of planar underexpanded impinging jets are parameterized based on nozzle parameters (standoff height, jet hydraulic diameter, and nozzle pressure ratio).