In this study we highlight the influence of mean dilatation and mean density gradient on the Reynolds stress modeling of compressible, heat-releasing and supercritical turbulent flows. Firstly, the modeling of the rapid pressure-strain correlation has been extended to self-consistently account for the influence of mean dilatation. Secondly, an algebraic model for the turbulent density flux has ...

Pulsatile motion of blood in a circular tube of varying cross-section has been developed by considering slip flow at the tube wall and the blood to be a non- Newtonian biviscous incompressible fluid. The tube wall is supposed to be permeable and the fluid exchange across the wall is accounted for by prescribing the normal velocity of the fluid at the tube wall. The tangential velocity of the fl...

Flow-induced blood damage plays an important role in determining the hemodynamic impact of abnormal blood flow, but quantifying of these effects, which are dominated by shear stresses in highly fluctuating turbulent flow, has not been feasible. This study evaluated the novel application of turbulence tensor measurements using simulated 4D Flow MRI data with six-directional velocity encoding for...

The present review presents basic concepts of blood rheology related to vascular diseases. Blood flow in large arteries is dominated by inertial forces exhibited at high flow velocities, while viscous forces (i.e., blood rheology) play an almost negligible role. When high flow velocity is compromised by sudden deceleration as at a bifurcation, endothelial cell dysfunction can occur along the ou...

the study of flow in compound channels with vegetated floodplains is essential to assessing the development of the stage-discharge relationship and sediment and pollutant transport. the present study experimentally investigated mean flow and turbulence characteristics in a prismatic compound channel. the experimental program consisted of vegetated and non-vegetated floodplains with different re...

The influence of a multi-scale fractal-based geometry on the decay of turbulence is investigated by comparing the turbulence produced by a square-fractal-element grid to that produced by two regular grids with similar physical properties. Comparison of the grid wakes at constant grid Reynolds number, ReM , identifies that in the farfield both regular grids produce comparable or higher turbulenc...

We examine the SI effects and Bachman’s SI Parameterization in a two-fronts LES simulation. The domain, governed by periodic horizontal temperature profile, consists of a Geostrophic Stable front and a Geostrophic Unstable front. In the study, we find that the Bachman’s SI Parameterization is not good enough to reproduce the Reynolds stress and the SI turbulent buoyancy transport in the LES sim...