This work presents results of flow simulations performed with the commercial code CFX 11.0 in a PWR 5x5 rod bundle segment with a split vane spacer grid. The geometrical configuration and flow conditions used in the experimental studies performed by Karoutas were assumed in the simulations. To make the simulation possible with a limited computational capacity and acceptable mesh refinement, the...

Abstract In this paper, to improve the combustion characteristics and working performance of solid fuel ramjet, a ramjet with gas generator is proposed. Based on k − ω SST Eddy-Dissipation equations, turbulent model established, internal flow field as well regression rate, species, were numerically analyzed. The results show that temperature rate increased. When airflow 0.4kg/s, increase will l...

In this work, the computational fluid dynamics technique is employed to study operating condition effects on optimum value of an important parameter called nozzle exit position (NXP) for ejector design. This uses gas R134a as working fluid. Numerical tests are carried out using a combination REFPROP 7.0 database state equation and high-Reynolds version SST k–ω model. Good agreement in terms ent...

The results of detailed numerical simulation of the flow in an injector including electrohydrodynamic interaction in sharply inhomogeneous electric field formed by electrode system closed to the needle-plane type are presented. The aim of the simulation is to estimate the charge rate flow at the fuel injector outlet. The results were obtained using the open-source package OpenFOAM in which the ...

Abstract The NACA4415 airfoil was numerically simulated with the help of Fluent software to analyze its aerodynamic characteristics. Results are acquired as follows: calculation accuracy is much higher than that XFOIL software; result SST k - ω (sstkw) turbulence model closest experimental value; within a certain range, larger Reynolds number is, lift coefficient and lift-to-drag ratio will be,...

Convective heat transfer and friction factor properties for periodic undulating channels are numerically investigated. The finite volume method (FVM) was used in the numerical study. Three different Reynolds averaged simulation (RANS) based turbulence models, shear stress transport SST k-ω transition model were compared with each other. Two used; first geometry is a sharp corrugated channel 30°...

22 23 The local atmospheric response to a realistic shift of the Oyashio Extension SST front in 24 the western North Pacific is analyzed using a high-resolution (0.25°, HR) version of the 25 global Community Atmosphere Model version 5 (CAM5). A northward shift in the SST 26 front causes an atmospheric response consisting of a weak surface wind anomaly but a 27 strong vertical circulation extend...