Both steady and unsteady turbulent mixed convection heat transfer in a 3D lid-driven enclosure, which has constant heat flux on the middle of bottom wall and with isothermal moving sidewalls, is reported in this paper for working fluid with Prandtl number Pr = 0.71. The other walls are adiabatic and stationary. The dimensionless parameters used in this research are Reynolds number, Re = 5000, 1...

The forward expansion hole improves the film cooling effectiveness by reducing penetration of coolant jet into main flow compared to cylindrical holes. In addition, compound angles improve promoting lateral spreading on a wall. Evidently, combination angle and shaped further adiabatic effectiveness. with 15° expansion, 35° inclination angle, 0° 30° at 0.5 1.0 blowing ratios was numerically simu...

Turbulent jet large eddy simulations (LES) are performed at Mach 0.9 and Reynolds number around 10. Implicit large-eddy simulation (ILES) is employed, namely omitting explicit subgrid scale models. The Reynolds-averaged Navier-Stokes (RANS) solution is blended into the near wall region. This makes an overall hybrid LES-RANS approach. A Hamilton-Jacobi equation is applied to remove the disparate...

Prediction of particle transport in enclosed environment is crucial to the welfare of its occupants. The prediction requires not only a reliable particle model but also an accurate flow model. This paper introduces two categories of flow models – Reynolds Averaged Navier-Stokes equation modeling (RANS modeling) and Large Eddy Simulation (LES); as well as two popular particle models – Lagrangian...

هدف: سوء‌مصرف مواد عبارت است از الگوی غیرانطباقی مصرف که طریق پیامدهای نامطلوب عودکننده و قابل‌ملاحظه مرتبط با استعمال مکرر ظاهر می‌شود. متغیرهای چندگانه بر شدت، مدت درمان اختلالات سوءمصرف تأثیر می‌گذارند. برآوردها در سال ۲۰۱۷ نشان داد ۲۷۱ میلیون نفر جهان یک یا چند ماده‌مخدر استفاده کرده‌اند. پژوهش حاضر نوع علی‌-مقایسه‌ای بود، هدف مقایسه تکانشوری، استحکام من، ناگویی هیجانی حمایت اجتماعی ادراک‌ش...

Flows around an axisymmetric body of revolution at a zero yaw angle were studied using hybrid Reynolds-averaged Navier–Stokes (RANS)/large eddy simulation (LES) approach, which employed full Reynolds stress model (RSM) in the RANS branch with aim accounting for anisotropy, streamline curvature, and flow separations boundary layer. The SUBOFF without appendages was applied to conduct simulations...

هدف: تطبیق‌پذیری شغلی یک ویژگی مطلوب است و افرادی که انطباق بیشتری با شغل خود دارند، از رضایت داشته، روحیه‌ی مثبتی در کار نشان داده نسبت به سازمان همکاران تعهد بالایی ابراز می­کنند. هدف پژوهش حاضر واکاوی نقش میانجیگری رفتار نوآورانه تطبیق­پذیری رابطۀ بین قابلیت­های زیرساختی عجین شدن عملکرد است.طراحی/ روش‌شناسی/ رویکرد: اﻳﻦ ﭘﮋوﻫﺶ نظر ﻫﺪف ﻛﺎرﺑﺮدی ﻧﻈﺮ جمع‌آوری داده‌ها، ﭘﻴﻤﺎﻳﺸﻲ­- ﺗﻮﺻﻴﻔﻲ اﺳﺖ. جامعۀ ...

This paper is addressing of a coupling Large-eddy simulation (LES) and RANS turbulence models with mixture fraction/probability density function as combustion model. The two have been implemented to simulate ethanol-air spray combustion. gas phase described the Eulerian approach while liquid designed using Lagrangian framework. LES/PDF obtained statistically. sub-grid scale energy equation used...

This work focuses on numerical simulations of flows inblade internal cooling system. Large Eddy Simulation (LES) andReynolds-Averaged Navier Stokes (RANS) approaches are com-pared in a typical blade cooling related problem. The case isa straight rib-roughened channel with high blockage ratio, com-puted and compared for both a periodic and full spatial domains.The con...