In numerous industries such as drilling, peening, cleaning, etc., a cavitating jet is adopted. However, it challenging to simulate the flow field numerically with accuracy. The of organ pipe cavitation nozzle simulated in this research using RNG k−ε, DES, and LES turbulence models. model can more accurately predict periodic shedding cloud, which basically consistent morphology captured high−spe...

Abstract A computational study of a supersonic flow in the base region and nearest wake cylindrical body moving at speed has been carried out. In this case, “prehistory” was taken into account, i.e. configuration domain as close possible to real one. The use various RANS turbulence models for calculating analyzed. following were considered: 1) SST model; 2) Standard k– ε 3) RNG 4) Reynolds Stre...

The bridge ‘hydraulics analysis and design’ could be substantially enhanced using advanced commercial Computational Fluid Dynamics (CFD) software and powerful parallel computing resources. The objective of the present study is to validate STAR-CD commercial CFD software for the bridge hydraulics research. This study simulates limited scaled experimental data conducted elsewhere for bridge flood...

In this work we demonstrate various weaknesses of the random number generator (RNG) in the OpenSSL cryptographic library. We show how OpenSSL’s RNG, knowingly in a low entropy state, potentially leaks low entropy secrets in its output, which were never intentionally fed to the RNG by client code, thus posing vulnerabilities even when in the given usage scenario the low entropy state is respecte...

A time signal prediction algorithm based on Relative Neighborhood Graph (RNG) localized FIR filters is defined. The RNG connects two nodes, of input space dimension D, if their lune does not contain any other node:. The FIR filters associated with the nodes, are used for local approximation of the training vectors belonging to the lunes formed by the nodes. The predictor training is carried out...

Urban ventilation plays an important role in regulating city climate and air quality. A numerical study was conducted to explore the ventilation effectiveness on the microclimate and pollutant removal in the urban street canyon based on the rebuilt Southern New Town region in Nanjing, China. The RNG k− ε turbulence model in the computational fluid dynamics (CFD) was employed to study the street...

Abstract: The major effects of cylindrical and row trenched cooling holes with angles alpha=30, beta=0, alpha=40, beta=0 alpha=50, at BR=3.18 on the effectiveness film near combustor end wall surface is an important subject to study in detail. In current study, researchers used a FLUENT package 16/11 simulate 3-D model Pratt Whitney gas turbine engine. this research, RNG turbulence K-ε was anal...

Fractal injectors can be used to intensify liquid-phase processes. The flow field, vortex structure and turbulent mixing performance induced by fractal with three different dimensions (D = 2, 2.58 3) are investigated. CFD simulations, using a renormalization group (RNG) k-ε turbulence model, validated particle image velocimetry (PIV) measurements. formation mechanism of the vortices studied. Bo...

The supercritical carbon dioxide Brayton cycle has gradually become a research focus, but we also see deficiency in related to the flow and heat transfer characteristics of S-CO2 boiler staves with high parameters. In this paper, is investigated 1000 MW cooled wall tube parameters pressure 30.42 MPa, mass flux 1592~2207 kg/(m2·s), 39.8~71.2 kw/m2; three-dimensional model CO2 fluid cooling estab...

A model of a submerged angular cavitation nozzle is established, which consists contraction part, parallel middle and expansion part. Based on the CFD technique, numerical simulation flow field carried out, in multiphase mixture model, renormalization group (RNG) k-ε turbulence are applied. Considering influence density cavitation, effects inlet outlet part velocity vapor volume fraction studie...