This paper describes a CFD model of the blast wave and fireball dynamics after high-pressure hydrogen tank rupture in fire open atmosphere. Experiments on tanks with nominal working pressure 35 MPa 70 are used to validate get insights into underlying physical phenomena. Parametric studies performed understand effect different sub-models, numerical methods other parameters, e.g. instantaneous or...

The effects of projectile rotation on the internal and external flow fields supersonic fluidic element are numerically studied using sliding grid technique RNG k-ε turbulence model. rotating speed fields, switching time output characteristics studied. results show that: for field, there is no obvious change in field structure at low angular velocity; when velocity increases to 20 r/s, becomes o...

In this paper which is an extended version of an article submitted to the Finite Volumes for Complex Applications V conference, we design a finite-volume based numerical scheme for the solution of the nonlinear balance equations of RNG variants of the well-known k − ε model and the v − f system encountered in the k − ε− v − f model which can be seen as an extension of first order turbulence mod...

In this study, the local scour around tripods in random waves is numerically investigated. The seabed-tripod-fluid numerical model with an RNG k−ε turbulence built and validated. Following that, characteristics flow velocity distribution are analyzed using present model. Finally, a revised stochastic proposed to predict equilibrium depth, Seq, waves. results indicate that capable of depicting p...

The mixing of oil and gas forms the foundation deep-sea extraction transportation. However, traditional conveying equipment has low efficiency high failure rates. In this study, a spiral axial flow liquid multiphase pump was used as base model. Eulerian model RNG turbulence were for numerical simulations to analyze internal field pump. A modification scheme proposed twist airfoil shape create t...

Contaminant transport and flow distribution are very important during an elevator ride, as the reduced social distancing may increase infection rate of airborne diseases such COVID-19. This investigation used a computational fluid dynamics (CFD) model based on RNG k–ϵ turbulence to predict airflow particle in elevator-lobby area with moving passengers. The CFD results showed complex pattern due...

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 ...

As a general framework to determine a collision-free feedback motion strategies, the Random Neighborhood Graph (RNG) approach [19] defines a global navigation function over an approximate representation of the free configuration. In this paper, we improve the RNG approach in several aspects. We present an ANN-accelerated RNG construction algorithm to achieve near logarithmic running time in eac...