Searched for: subject%3A%22RANS%255C%2Bturbulence%255C%2Bmodel%22
(1 - 12 of 12)
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van de Krol, Bart (author)
The most used RANS-model in relation to wind farms, k−epsilon, has significant shortcomings. It over-predicts the eddy viscosity in the near-wake and fails to model the anisotropy of the turbulence quantities. The Sparse Regression of the Turbulence Stress Anisotropy (SpaRTA) method could remedy these shortcomings. This method uses temporally...
master thesis 2022
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Sivanandan, Hrishikesh (author)
The present work studies the impact of self-induced Atmospheric Gravity Waves (AGWs) excited by an moderately sized offshore wind farm immersed in a Conventionally Neutral Boundary Layer (CNBL). A wind farm of finite span-wise length, consisting of 25 NREL 15MW wind turbines laid out in (5 X 5 Aligned manner) is considered. In order to achieve...
master thesis 2021
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van Put, Max (author)
This study presents the numerical modeling of boundary layer flame flashback in premixed tube burners with turbulent flow and high hydrogen content. The modeling approach is based on a RANS turbulence model and a flamelet combustion model using a flame surface density approach in combination with multiple turbulent flame speed correlations to...
master thesis 2021
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Sciacchitano, A. (author), Arpino, F. (author), Cortellessa, G. (author)
We present an experimental benchmark database for the transitional cavity flow. The database is obtained by planar Particle Image Velocimetry measurements at the median plane of the cavity model, for Reynolds numbers between 6300 and 19,000 based on the cavity height. A detailed uncertainty analysis of the experimental results is performed...
journal article 2021
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Diez Sanhueza, Rafael (author)
Turbulence modelling corresponds to one of the greatest unsolved problems in physics and mathematics. This phenomenon is marked by the emergence of chaotic vortex structures in the solution of the Navier-Stokes equations, and it corresponds to the leading-order effect in the majority of the flows observed in nature. Due to the importance of...
master thesis 2018
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Otero Rodriguez, G.J. (author), Patel, A. (author), Diez Sanhueza, Rafael (author), Pecnik, R. (author)
This paper presents a novel methodology for improving eddy viscosity models in predicting wall-bounded turbulent flows with strong gradients in the thermo-physical properties. Common turbulence models for solving the Reynolds-averaged Navier–Stokes equations do not correctly account for variations in transport properties, such as density and...
journal article 2018
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Verheij, Lennart (author)
In turbomachinery optimisation problems, run time is often a critical factor due to high dimensionality of the design search space. This work explores the use of the multi-fidelity method to speed up an aerodynamic optimisation algorithm applied to axial compressor blades. A rotor blade is optimised in a two-stage blade geometry for maximum...
master thesis 2017
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Abolghasemi, M.A. (author), Piggott, M.D. (author), Spinneken, J (author), Viré, A.C. (author), Cotter, CJ (author), Crammond, S. (author)
Embedding tidal turbines within simulations of realistic large-scale tidal flows is a highly multi-scale problem that poses significant computational challenges. Here this problem is tackled using actuator disc momentum (ADM) theory and Reynolds-averaged Navier–Stokes (RANS) with, for the first time, dynamically adaptive mesh optimisation...
journal article 2016
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Abolghasemi, A. (author), Piggott, M.D. (author), Spinneken, J. (author), Vire, A. (author), Cotter, C.J. (author)
A versatile numerical model for the simulation of flow past horizontal axis tidal turbines has been developed. Currently most large-scale marine models employed to study marine energy use the shallow water equations and therefore can fail to account for important turbulent physics. The model presented here is based on actuator disc momentum (ADM...
conference paper 2015
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Wackers, J. (author)
Surface capturing is a technique for modelling the water surface in numerical computations of water flow: the computational grid is not deformed, a separate surface model gives the location of the water surface in the grid. Surface capturing is generally applicable and can handle complicated ship geometries. For steady flow problems, the major...
doctoral thesis 2007
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Popovac, M. (author), Hanjalic, K. (author)
journal article 2007
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Knopp, T. (author)
A universal wall-function method for RANS turbulence modelling is presented, which is designed by consistency between the global turbulence model and the near-wall model. This ensures solutions independent of the wall-distance of the first grid node above the wall provided it is located in the logarithmic part of the boundary layer or below. The...
conference paper 2006
Searched for: subject%3A%22RANS%255C%2Bturbulence%255C%2Bmodel%22
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