Erosion caused by sand transportation in flow changing devices is a serious concern in the hydrocarbon and mineral processing industry, which entail to failure and malfunction of flow devices. In this study, computational fluid dynamics (CFD) with discrete phase models (DPM) were employed for analysis of carbon steel long radius 90-Degree elbow erosion due to the sand concentration of 2, 5 and ...

A shear-improved Smagorinsky model is introduced based on recent results concerning shear effects in wall-bounded turbulence by Toschi et al. (2000). The Smagorinsky eddyviscosity is modified as νT = (Cs∆) (|S|−|〈S〉|): the magnitude of the mean shear |〈S〉| is subtracted to the magnitude of the instantaneous resolved strain-rate tensor |S|; here CS is the standard Smagorinsky constant and ∆ deno...

Cross correlations of the fluctuating wall-shear stress and the streamwise velocity in the logarithmic region of turbulent boundary layers are reported over 3 orders of magnitude change in Reynolds number. These results are obtained using hot-film and hot-wire anemometry in a wind tunnel facility, and sonic anemometers and a purpose-built wall-shear stress sensor in the near-neutral atmospheric...

Knowledge of suspension rheology can help in the prediction of its behavior under various flow conditions. Considerable theoretical effort has been made to model the macroscopic properties of suspensions of rigid particles in a Newtonian fluid, but for the most part it has been limited to zero particle Reynolds number. In this paper we investigate the effect of finite particle Reynolds number o...

Direct numerical simulations of the Navier–Stokes equations have been carried out with t § he objective of studying turbulent boundary layers in adverse pressure gradients. The boundary layer flows concerned are of the equilibrium type which makes the analysis simpler and the results can¨be compared with earlier experiments and simulations. This type of turbulent boundary layers a © lso permits...

The aim of the present work is to investigate role intense Reynolds shear-stress events in generation secondary flow turbulent ducts. We consider connected regions where product instantaneous fluctuations two velocity components higher than a threshold based on long-time turbulence statistics, spirit three-dimensional quadrant analysis proposed by Lozano-Durán et al. (J. Fluid Mech., vol. 694, ...