In order to measure flow rate in open channels, including irrigation hydraulic structures are used with a relatively high degree of reliance. Venturi flumes among the most common and efficient type, they can discharge using only water level at specific point within converging section an empirical relationship. There have been limited number attempts simulate venturi flume computational fluid dy...

in this paper, by numerical simulation of gas flow, effects of divergence angles on the amplification factor, side force and thrust vector magnitude of a moveable nozzle with supersonic split line have been investigated. the study is conducted for constant exit to throat area ratio and the location of the split line is also constant. the finite volume method with second order upwind scheme for ...

Abstract The cave is of great importance for the storage equipment and to avoid having workers in tunnel, but it changes tunnel section, leads a change slipstream affects safety trains workers. Re-normalization group (RNG) k-ε turbulence method used investigate induced by single train passing through double-track at 350 km/h. with without compared. components three directions are reported compr...

Abstract The USBR VI stilling basin is one of the oldest basins designed to dissipate energy at outlet pipes. In this study, effect two parameters including Froude number (Fr) inlet flow and ratio width equivalent depth ( W / D ) on characteristics mean turbulent inside were investigated, numerically. Reynolds Averaged Navier–Stokes (RANS) equations solved with Re-Normalization Group (RNG) k-ε ...

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...

The objective of this study is to investigate the possible transmission mechanism of inter-flat air cross-contamination under the condition of singlesided natural ventilation. In high-rise residential building with flush windows on the same side, the air pollutants can diffuse from lower flat to adjacent upper flat in the vertical direction related to the interflat air flow through open windows...

The renormalization group (RNG) analysis of the Kosterlitz–Thouless (KT) phase transition is a basic paradigm in statistical physics and a well-known success of the RNG approach. It was recently shown that the derivation of the RNG parameter flow for the KT problem rests on the assumption of one-sided polarization, which is implausible and cannot be derived from first principles. We extend this...