The unsteady and random character of turbulent flow motion is a key aspect of the multidimensional modeling of internal combustion engines (ICEs). A typical example can be found in the prediction of the cycle-to-cycle variability (CCV) in modern, highly downsized gasoline direct injection (GDI) engines, which strongly depends on the accurate simulation of turbulent in-cylinder flow structures. ...

هدف از این مقاله، بررسی جریان سه بعدی در یک سیستم کنترل بردار نیروی پیشران دارای چهار تیغه ی منحرف کننده عمود بر هم در داخل پوشش قرار گرفته در قسمت عقب یک نازل همگرا و واگرا می باشد. در شبیه سازی های عددی سه بعدی انجام شده، معادلات سه بعدی ناویر استوکس میانگین گیری شده زمانی به همراه مدل آشفتگی rng k-ε در شبکه بی سازمان هرمی حل شده است. تمام ویژگی های اساسی جریان شامل تداخل موج های شوک تولید شد...

The paper considers the problem of selecting a turbulence model to simulate natural convection near surface VVER-1000 fuel assembly unloaded from reactor by computational fluid dynamics (CFD simulation) methods. is selected comparing calculated data obtained using Ansys Fluent software package with results experimental studies on heated vertical plate immersed in water, which simulates side fac...

A three-dimensional numerical simulation of airflow, temperature, and pollutant concentration distributions with underfloor air distribution (UFAD) system displacement ventilation (DV) systems are presented for different operating conditions. Since the particles deposited on floors can be re-introduced into through re- suspension then constitute a threat to human’s health, an optimal is require...

Abstract Stepped spillways are suitable and economical options for high-storage dams that require significant energy dissipation, structural adaptation to roller-compacted concrete dams, spontaneous flow aeration. In this study, a numerical analysis of the hydraulic characteristics skimming regime stepped spillway Zirdan Dam is carried out. A comparison between smooth provided. By preparing mod...

In this article, the optimization of a twisted strip heat exchanger was explored aiming at enhancing transfer. To end, governing equations using ANSYS-FLUENT software and nanofluid flow k-ε RNG turbulence model were simulated in exchanger, respectively. The investigated parameters included temperature, pressure, velocity, kinetic energy (TKE), concentration, shape factor, Reynolds number, diame...

Turbulence phenomena created around a greenhouse due to different wind loads are key factors in its structural design and significantly affect the ventilation rates through side roof openings. Using turbulence models of ANSYS FLUENT software investigate airflow an arched-roof-greenhouse-shaped obstacle placed inside tunnel was aim this study. Velocity pressure areas were examined by selecting t...