Simulation and Analysis of a Turbulent Flow Around a Three-Dimensional Obstacle

Abstract

The study of flow around obstacles is devised into three different positions: above the obstacle, upstream of the obstacle, and downstream of the latter. The behaviour of the fluid downstream of the obstacle is less known, and the physical and numerical modelling is being given the existence of recirculation zones with their complex behaviour. The purpose of the work presented below is to study the influence of the inclined form of the two upper peaks of a rectangular cube. A three-dimensional study was carried out using the ANSYS CFX calculation code. Turbulence models have been used to study the flow characteristics around the inclined obstacle. The time-averaged results of contours of velocity vectors <V>, cross-stream <v> and stream wise velocity <u> and streamlines were obtained by using K-ω shear -stress transport (SST), RANG K-ε and K-ε to model the turbulence, and the governing equations were solved using the finite volume method. The turbulence model K-ω SST has presented the best prediction of the flow characteristics for the obstacle among the investigated turbulence models in this work.

Role of gas flow direction on monolayer MoS2 growth on patterned surfaces via CVD

“…They showed that reduced velocity or pressure led to an increased MoS 2 grain size, which could result from longer residence times on the surface [29]. The flow perpendicular to the microchannels may give rise to the augmentation of the number of vortices enhancing the intensity of the turbulence around the channels resulting in non-uniform dispersion [21]. In this context, Gokul et al achieved to grow large area monolayer MoS 2 through the modulation of the gas flow direction by placing barriers on the substrate and adjusting their geometry at the desired location [20].…”

“…Gokul et al achieved to module the flow by placing barriers on the substrate and obtained large-area monolayer MoS 2 crystals at the desired locations by changing geometry of the barrier [20]. Benahmed et al theoretically investigated the behavior of flow around an obstacle, monitoring the pressure gradient that lead to eddies [21]. Sing et al tuned the gas flow by changing the boundary layer concentration where the velocity of precursor gases is affected.…”

Three-Dimensional Numerical Simulation of a Flat Plate Solar Collector with Double Paths

“…The study by Benahmed and Aliane [11] presents the flow around the obstacles, they did the digital validation of 3D by the work of Hussein and Martinuzzi (1996). this work is a three-dimensional simu-lation using the ANSYS CFX calculation code to carry out a three-dimensional numerical simulation of turbulent flow around an obstacle with inclined upstream and downstream edges It has been explained that the satis-factory results have not been obtained using the k-ε and RNG k-ε methods and that the turbulence model k-ω SST gave better results after analyses as a function of time.…”

Turbulent Flow Around Obstacles: Simulation and Study with Variable Roughness

“…The drag coefficient increased only when the ratio D/H was equal to 0.32. On the other hand, Benahmed and Aliane [34] investigated the effect of the two upper inclined edges of a rectangular cube on the flow structure. Afterwards, a three-dimensional study was conducted using the ANSYS CFX calculation code, and the turbulence models were applied to analyse the characteristics of the flow around the inclined obstacle.…”