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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 29 for “"RNG"”.
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Topologies for ad-hoc networks utilizing directional antennas with restricted fields of view
… are based on the Relative Neighbor Graph (RNG): the first constrains the RNG to requirements of the ORCLE network, the second augments the constrained RNG with edges from the Delaunay Triangulation, and the third algorithm tries to improve on the second by adding edges to reduce the …
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Numerical Simulation of Injection and Mixing in Supersonic Flow
… a comparison of two renormalized group theory (RNG) based k-epsilon turbulence models with a more conventional k-epsilon model. The chosen designs were an unswept ramp injector with four injection ports and a novel nine-hole injector array. The objectives of the investigation were to provide …
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Transforming Point Data into Proximity Graphs
… graphs (GG), relative neighborhood graphs (RNG), and minimum spanning tree (MST). These graphs find their applications in geographical analysis, spatial analysis, pattern recognition, evolutionary biology, computer vision, cluster analysis, and visualization. The emergence of big data has …
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Numerical and experimental study of flow in a gas turbine chamber.
… study via the FLUENT 6.3 code with a k-epsilon (RNG) turbulence model.Results of the CFD models were carefully validated by studying aerodynamic flow and heat transfer in turbine blade film cooling performance. A two-dimensional channel and NACA 0012 airfoil were selected to investigate …
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CFD modelling and validation of a large 2-stroke marine diesel engine
… near the wall. It was concluded that the RNG and the realisable Ҡ-Ɛ turbulence models predict the same best flow field and non-equilibrium wall function produces the best heat transfer results. Following this, the spray breakup models were evaluated through the constant volume spray …
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Accelerating Probabilistic Computing with a Stochastic Processing Unit
… high-quality true Random Number Generation (RNG). We further explore how quality of an RNG is related to application end-point result quality. Unexpectedly, we discover the target applications do not necessarily require high-quality RNGs---a simple 19-bit Linear-Feedback Shift Register (LFSR) …
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Modeling of flow in impeller stirred tanks using computational fluids dynamics
… was also made between the standard k-s and RNG models. It was found that the standard k-s turbulence model gave better predictions of the flow than the RNG- k-s turbulence model.
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A Detailed Study of Fan-Shaped Film-Cooling for a Nozzle Guide Vane for an Industrial Gas Turbine
… of two popular turbulence models, the RNG-kε and the v2-f model, in predicting film-cooling effectiveness. Results showed that the RNG-kε offered the closest prediction in terms of averaged effectiveness along the vane surface. The v2-f model more accurately predicted the separated flow …
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A Comprehensive Study of Buoyant Rosette Jets Using Laboratory Experiments, CFD, and Machine Learning
… of three RANS turbulence models - standard k-ε, RNG k-ε, and SST k-ω - was evaluated for two different Fr number cases (high Fr number 5.81 and low Fr number 2.23). The RNG k-ε model performs well in predicting centerline trajectories and concentration fields under momentum-dominated conditions, …
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The Evaluation of Time-Dependent Flow in Swirl Burners
… (RSM) and the Re-normalisation Group Model (RNG). Constant velocity scaling of the 100 and 500 kW burner was examined in both experimental and computational studies.<br/><br/>The experimental results show that the flowfield structures in both burners are nonaxisymmetric and develop …
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Believe It or Not: Examining the Case for Intuitive Logic and Effortful Beliefs
… were more affected by random number generation (RNG) (Experiment 5). To reconcile these findings we examined the role of Working Memory (WM) and Inhibition in Experiments 7 – 9 and found, contrary to Experiment 5, belief judgments were more demanding of executive resources and correlated with ID …
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Gas-liquid simulation of an airlift bubble column reactor
… is described by using the K-Epsilon model, RNG K-Epsilon model and K-Omega model. This process occurs under atmospheric pressure. The volume fraction of model is described the behavior of bubble which is represented by the parameters of gas hold up, contact surface area and gas superficial …
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Implementation of a non-linear eddy viscosity turbulence model into Hydra-TH for fuel related applications
… code to supplement the already fully-functioning RNG [kappa]-[epsilon] model. The three [kappa]-[epsilon] model variants are then applied to the 'classic' engineering test cases of flow in a square duct and a U-channel bend in order to highlight the relative merits and deficiencies of the …
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Manganese removal from an organic-laden surface water
… effective as pretreatments at dosages of 5 and 2 rng/L, respectively. Potassium permanganate proved effective at dosages of 0.5 to 0.625 mg/L (1.5 to 1.9 times the theoretical requirement). Aeration proved effective in reducing levels of approximately 0.1 mg/L to below the secondary maximum …
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Computational fluid dynamics modelling of displacement natural ventilation.
… The two benchmarks are defined using the RNG k-epsilon turbulence model. A pressure boundary is applied onto the ventilation openings directly and a porous medium boundary is used to assist the development of the thermal plume. This method has proved to be robust and the close agreement …
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CFD modelling of pipe erosion under multiphase flow regimes.
… to account for the flow and particle behaviour, RNG k - e model for the effects of turbulence and erosion rate was calculated using the Oka et al. model. A pseudo-single phase model was also evaluated in order to reduce the simulation resources to predict erosion in elbows mounted in series. …
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Implementation of a trim routine in a rotor model for the numerical simulation of helicopter flow-fields
… approach grids the k - ε, and its variants, the RNG and realizable models were found to be suitable choices. For the near wall modelling approach grids used, the SST models performed the best. The rotor model used during this investigation utilised a combination of blade element and actuator disk …
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3D Numerical Simulation to Determine Liner Wall Heat Transfer and Flow through a Radial Swirler of an Annular Turbine Combustor
… models are tested and it is found that the RNG k-e model with swirl correction gives the best comparisons with experiments. The Swirl number is shown to be an important factor in the behavior of the resulting flow field. The swirl flow entering the combustor expands and impinges on the …
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Comprehensive Modeling and Numerical Investigation of Entrained-Flow Coal Gasifiers
… models (standard k-ε, k-ω, RSM, k-ω SST, and k-ε RNG) and four devolatilization models (Kobayashi, single rate, constant rate, and CPD) on gasification simulation. A study is also conducted to investigate the effects of different operation parameters on gasification process including coal mixture …
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