Searched for: subject%3A%22eddy%255C%2Bviscosity%22
(1 - 18 of 18)
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Marynets, K. (author)
We study boundedness of solutions to a linear boundary value<br/>problem (BVP) modelling a two-layer ocean with a uniform eddy viscosity in<br/>the lower layer and variable eddy viscosity in the upper layer. We analyse<br/>bounds of solutions to the given problem on the examples of different eddy<br/>viscosity profiles in the case of their...
journal article 2022
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Cegielski, Gustaw (author)
Model order reduction (MOR) has been a field of active research in the past twenty years, more recently also in fluid dynamics. The main advantage of MOR is computational cost reduction, which, along with equally important accuracy, constitute main objective in the MOR community.<br/>A main ongoing issue is that data volumes in fluid flow...
master thesis 2021
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Dijkshoorn, Dominic (author)
Organic Rankine Cycle (ORC) Power Plants can be of greatimportance in the energy transition as they are suitable for converting wasteheat to power and can utilize renewable energy for their operation. To improvethe efficiency of ORC Power Plants, the physical phenomena inside thesemachines must be understood....
master thesis 2020
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Kaandorp, Mikael L.A. (author), Dwight, R.P. (author)
A novel machine learning algorithm is presented, serving as a data-driven turbulence modeling tool for Reynolds Averaged Navier-Stokes (RANS) simulations. This machine learning algorithm, called the Tensor Basis Random Forest (TBRF), is used to predict the Reynolds-stress anisotropy tensor, while guaranteeing Galilean invariance by making use...
journal article 2020
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Modesti, D. (author)
We carry out a priori tests of linear and nonlinear eddy viscosity models using direct numerical simulation (DNS) data of square duct flow up to friction Reynolds number Re <sub>τ</sub>= 1055. We focus on the ability of eddy viscosity models to reproduce the anisotropic Reynolds stress tensor components a<sub>ij</sub> responsible for...
journal article 2020
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Zuo, L. (author), Roelvink, D. (author), Lu, Yongjun (author)
Suspended sediment concentration (SSC) is one of the fundamental topics in sediment study. The parameterization of the SSC profile of silty sediments is still under-researched. This study focuses on the mean SSC profile for silty sediments under non-breaking wave-dominant conditions. First, inspired by a 1DV model, different types of the...
journal article 2019
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Meijers, P.C. (author)
Turbulence plays an important role in a broad range of engineering applications. In the industry RANS simulations are a common method for predicting turbulent flow. A broad range of RANS turbulence models have been developed over the past decades. For the assessment of complex three-dimensional flow fields Reynolds Stress Transport Models are a...
master thesis 2016
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Eca, L. (author), Hoekstra, M. (author)
This paper addresses the method of manufactured solutions for RANS solvers, i.e. in the context of the calculation of incompressible turbulent flows with eddy-viscosity turbulence models. The difficulties caused by damping and/or blending functions included in the turbulence models are discussed. The need to manufacture the turbulence quantities...
conference paper 2006
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Eca, L. (author), Hoekstra, M. (author)
This paper presents an exercise of Code Verification with two manufactured solutions valid for 2D RANS equations supplemented either with the one-equation Spalart & Allmaras or with the two-equation BSL k-w turbulence model. When the manufactured solution is applied with the eddy viscosity frozen, second order convergence behaviour is shown....
conference paper 2006
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Raisee, M. (author), Jafari, A. (author)
This paper discusses the abilities of two different low-Reynolds-number eddy-viscosity models in resolving the complex physical features that arises in turbulent flows around a square cylinder at Re=22000. For the modeling of turbulence, the Launder & Sharma (LS) [1] and Kawamura & Kawashima (KK) [2] low-Re models have been employed. The present...
conference paper 2006
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Uittenbogaard, R.E. (author), Stolker, C. (author), Goede, E.D. de (author), Kester, J.A.T.M. van (author), Jagers, H.R.A. (author), Wijbenga, J.H.A. (author)
report 2005
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Bijvelds, M.D.J.P. (author), Goede, E.D. de (author)
report 2000
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van der Ven, H. (author)
In this TP a family of filters for Large Eddy Simulation with nonuniform filter widths is constructed that commute with differentiation up to any given order.
report 1994
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Meijer, D.G. (author), Hofmans, G.J.C.M. (author), Otta, A.K. (author)
report 1992
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Hoffmans, G.J.C.M. (author)
A two dimensional mathematical model DUCT, which is based on a parabolic boundary layer technique, using finite elements, is proposed to predict the flow and turbulence field in complicated geometrical conditions, where recirculating flow may occur. Numerical results of the DUCT-model are compared with k-eps-predictions as well as laboratory...
report 1988
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Hoffmans, G.J.C.M. (author)
The general purpose of this research project is to model mathematically the local scour downstream of a structure (2-D). The model has to simulate the development of the scour as a function of the time. Basically two models are necessary namely a flow model and a morphological model. The latter model has to describe the bed and suspended load...
report 1988
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Booij, R. (author)
For the prediction of dispersion phenomena and of changes in the morphology of an alluvial bottom, a detailed description of the water flow is necessary. The flow in estuaries is a complicated one, partly because of the time-dependence. To isolate this aspect of tidal flow a simplifying one-dimensional (vertical) flow model 1S used. This one...
report 1982
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Booij, R. (author)
In this investigation the reproduction of tidal flow in channels of estuaries by means of several simple mathematical models is considered. Attention is mainly paid to velocity and shear stress profiles and to hysteresis effects of the shear stresses with respect to the surface velocity. Only one-dimensional models obtained by neglect of...
report 1981
Searched for: subject%3A%22eddy%255C%2Bviscosity%22
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