In this work the steady-state flow in a commercial dry powder inhaler device, DPI (i.e., Turbuhaler) is described using computational fluid dynamics. The Navier-Stokes equations are solved using commercial CFD software considering different flow models, i.e., laminar, k-ε, k-ε RNG, and k-ω SST as well as large Eddy simulation. Particle motion and deposition are described using a Eulerian-fluid/...

Flow in a gas-lift digester with a central draft-tube was investigated using computational fluid dynamics (CFD) and different turbulence closure models. The k-ω Shear-Stress-Transport (SST), Renormalization-Group (RNG) k-∊, Linear Reynolds-Stress-Model (RSM) and Transition-SST models were tested for a gas-lift loop reactor under Newtonian flow conditions validated against published experimental...

Abstract The accuracy of wind flow simulation in mountain area micro-topography is related to discrete scheme, turbulence model and wall function. In this paper, the standard hill adopt analyze calculation different models. Four models, including RNG k-ε, k-ω , SST TSST were used calculation, compared with result tunnel test. results second-order upwind or scalable function are basically consis...

Abstract A new concept design Catamaran Decommissioning Unit has been developed by Research Center for Hydrodynamics Technology Indonesia. The catamaran a unique shape, however in order to achieve resilient and sustainable the decommissioning unit as it resistance analysis both model testing numerical calculation must be conducted. value from needs validated with results towing tank. of scaling...

In this paper, a numerical assessment of the effect shallow water on total resistance solar catamaran SolarCat is carried out using computational fluid dynamics within software package STAR–CCM+. The unsteady viscous flow was modelled based Reynolds-averaged Navier–Stokes (RANS) equations with application k−ω SST (k−ω Shear Stress Transport) turbulence model. RANS were discretized by finite vol...

in this paper, analysis of fluid flow and heat transfer over the bank of tubes is considered. k-ω sst model is applied for simulation of turbulent flow. in this paper, the improvement of efficiency of a bundle of circular tubes by changing the shape of the cross section of one row of the pipes to the elliptical cross section as an innovative plan is considered. as know, friction factor in turbu...

compressible gas flow inside a convergent-divergent nozzle and its exhaust plume atdifferent nozzle pressure ratios (npr) have been numerically studied with severalturbulence models. the numerical results reveal that, the sst k–ω model give the bestresults compared with other models in time and accuracy. the effect of changes in value ofdivergence half-angle (ε ) on the nozzle performance, thru...

The steady state compressible Navier-Stokes equations are solved with an explicit Runge-Kutta scheme accelerated by multigrid and an implicit preconditioner. Extensions are made to include a k-ω/SST turbulence model and chemical reactions. The implicit smoother enables the use of high CFL numbers yielding fast convergence. We present applications to turbulent solutions for flows about wings and...

In this paper, the numerical models are selected to simulate hydrothermal plume based on water temperature observation data of Longqi field in Southwest Indian Ridge (SWIR). Then, unsteady Reynolds-averaged Navier–Stokes equations solved evaluate performance Realizable k-ε (rke) model and SST k-ω (sst) simulation. By comparing calculated results with Conductivity Temperature Depth (CTD) literat...

This study reports on the numerical analysis of impact mass ratio Vortex-Induced Vibration (VIV) phenomenon an elastically rigid cylinder, oscillating freely in a crossflow direction. Reynolds-averaged Navier–Stokes (RANS) equations with (k-ω SST) model were used to analyze flow behavior, amplitude and vortex shedding patterns. The was performed at constant Reynold number (Re) = 104 reduced vel...