Searched for: subject%3A%22Numerical%255C%2Bsimulations%22
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Frank, D. (author), Jha, N.K. (author), Koene, F.G.H. (author), Kemp, R.E.J. (author), Twerda, A. (author), Linden, P.F. (author)
An air curtain is a planar turbulent air jet, which is used to separate two zones maintained at different temperatures. One of the aims of using an air curtain in the doorway of a building is to minimise the heat losses from the warm room to the cold environment and thus, to save energy. It is important to know how well an air curtain performs...
article 2022
document
López-González, M.C. (author), Del Pozo, G. (author), Martín-Martín, D. (author), Muñoz-Díaz, L. (author), Pérez-Martínez, J.C. (author), Hernández-Balaguera, E. (author), Arredondo, B. (author), Galagan, Y. (author), Najafi, M. (author), Romero B., (author)
Perovskite solar cells (PSCs) have become very popular due to the high efficiencies achieved. Nevertheless, one of the main challenges for their commercialization is to solve their instability issues. A thorough understanding of the processes taking place in the device is key for the development of this technology. Herein, J-V measurements have...
article 2021
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Kahrobaei, S.S. (author), Fonseca, R.M. (author), Willems, C.J.L. (author), Wilschut, F. (author), Wees, J.D.A.M. (author)
In the geothermal energy domain, it is common practice to drill a doublet (i.e. an injection and production well pair) system for heat production from the subsurface. Injector-producer spacing typically varies between 1 to 2 km. This well spacing distance is usually chosen through engineering judgement. The concept of drilling doublet systems is...
conference paper 2019
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Kozhevnikov, A. (author), Kunnen, R.P.J. (author), van Baars, G.E. (author), Clercx, H.J.H. (author)
Purpose: This paper aims to explore the fluid flow in the stereolithography process during the recoating step. The understanding of the flow dynamics can be used as an input for an active control of the resin surface height map. The recoating over a rectangular cavity has been considered to investigate the influence of the cavity depth on the...
article 2019
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Lippert, T. (author), Ruhnau, M. (author), Lippert, S. (author), von Estorff, O. (author), Ainslie, M.A. (author), Nijhof, M. (author)
The effect of pile driving noise on the marine environment is an important factor in environmental impact assessment of planned marine structures, such as ports, bridges or offshore wind farms. Numerous models have been developed to predict the noise levels to be expected from such activities and to advise suitable mitigation measures to concur...
conference paper 2017
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Verreault, J. (author)
The PELE ammunition is characterized by a low-density filling material surrounded by a high-density brittle jacket material. An analytical model describing the fragmentation of this ammunition behind a target plate is presented. This model assumes uniaxial strain in the filling and uses the RankingeHugoniot relations to calculate the material...
article 2015
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Couto, S. (author), Assembleia, A. (author), Visser, J.H.M. (author), Mayor, T.S. (author)
The performance of concrete products depends not only on the concrete compositions but also
article 2015
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Wilson, C. (author), van Eijk, A.M.J. (author), Fedorovich, E. (author)
A methodology is presented to infer the refractive-index structure function parameter and the structure parameters for temperature and humidity from numerical simulations of the turbulent atmospheric convective boundary layer (CBL). The method employs spatial and temporal averaging of multiple realizations of the CBL flow field reproduced by a...
conference paper 2013
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Brondijk, J.J. (author), Torricelli, F. (author), Smits, E.C.P. (author), Blom, P.W.M. (author), de Leeuw, D.M. (author)
The charge injection barriers in organic field-effect transistors (OFETs) seem to be far less critical as compared to organic light-emitting diodes (OLEDs). Counter intuitively, we show that the origin is image-force lowering of the barrier due to the gate bias at the source contact, although the corresponding gate field is perpendicular to the...
article 2012
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Lutgendorf, D. (author), Wessels, P.W. (author), van den Eerden, F.J.M. (author), de Roo, F. (author)
Within the EU FP7 QUIESST project, QUIeting the Environment for a Sustainable Surface Transport, a test method is being developed for the reflectivity of noise barriers. The method needs to account for a complex shape of barriers and the use of various types of absorbing materials. The performance of a barrier is to be measured in the near field...
conference paper 2012
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Nicolai, H.T. (author), Hof, A. (author), Oosthoek, J.L.M. (author), Blom, P.W.M. (author)
The charge transport in blue light-emitting polyspirobifluorene is investigated by both steady-state current-voltage measurements and transient electroluminescence. Both measurement techniques yield consistent results and show that the hole transport is space-charge limited. The electron current is found to be governed by a high intrinsic...
article 2011
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Gromala, P. (author), Duerr, J. (author), Dressler, M. (author), Jansen, K.M.B. (author), Hawryluk, M. (author), de Vreugd, J. (author)
Numerical simulation plays an important role in product design. Its accuracy relays on a detailed description of geometry, material models, load and boundary conditions. This paper focuses on a new approach of FEM material modeling of three commercially available molding compounds. Curing shrinkage, modulus of elasticity and coefficient of...
conference paper 2011
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Torricelli, F. (author), Meijboom, J.R. (author), Smits, E. (author), Tripathi, A.K. (author), Ferroni, M. (author), Federici, S. (author), Gelinck, G.H. (author), Colalongo, L. (author), Kovacs-Vajna, Z.M. (author), de Leeuw, D. (author), Cantatore, E. (author)
Thin-film transistors (TFTs), which use zinc oxide (ZnO) as an active layer, were fabricated and investigated in detail. The transport properties of ZnO deposited by spray pyrolysis (SP) on a TFT structure are studied in a wide range of temperatures, electrical conditions (i.e., subthreshold, above-threshold linear, and saturation regions), and...
article 2011
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van den Berg, A.C. (author), TNO Defensie en Veiligheid (author)
The availability of powerful computers these days increasingly enables the use of CFD for the numerical simulation of explosion phenomena. The BLAST software consists of a compilation of codes for the numerical simulation of the gas dynamics of explosions. Each individual code has been tailored to a specific application. After a brief...
article 2009
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Hrapko, M. (author), van Dommelen, J.A.W. (author), Peters, G.W.M. (author), Wismans, J.S.H.M. (author), TNO Industrie en Techniek (author)
The objective of this work was to investigate the influences of constitutive non linearities of brain tissue in numerical head model simulations by comparing the performance of a recently developed non linear constitutive model [10, 11] with a simplified version, based on neo-Hookean elastic behaviour, and with a previously developed...
article 2009
document
Versluis, R. (author), Dorsman, R. (author), Thielen, L. (author), Roos, M.E. (author), TNO Industrie en Techniek (author)
A new approach for performing numerical direct simulation Monte Carlo (DSMC) simulations on turbomolecular pumps in the free molecular and transitional flow regimes is described. The chosen approach is to use surfaces that move relative to the grid to model the effect of rotors and stators on a gas flow. The current article describes the method...
article 2009
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van den Ende, D.A. (author), Bos, B. (author), Groen, W.A. (author), Dortmans, L.M.J.G. (author), TNO Industrie en Techniek (author)
We report an investigation into factors limiting the functional lifetime of multilayer piezoceramic actuators. The study consists of a combination of lifetime experiments by means of an accelerated lifetime test, inspection of the actuator microstructure at different stages of the accelerated lifetime test, and numerical simulation of the...
article 2009
document
Visser, A. (author), Schaap, J.D. (author), Leijnse, T. (author), Broers, H.P. (author), Bierkens, M.F.P. (author), TNO Bouw en Ondergrond (author)
Degassing of groundwater by excess denitrification of agricultural pollution complicates the interpretation of 3H/3He data and hinders the estimation of travel times in nitrate pollution studies. In this study we used a two-phase flow and transport model (STOMP) to evaluate the method presented by Visser (2007a) to interpret degassed 3H/ 3He...
conference paper 2008
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Jansen, S.T.H. (author), Verhoeff, L. (author), Cremers, R. (author), Schmeitz, A.J.C. (author), Besselink, I.J.M. (author), TNO Industrie en Techniek (author)
The accuracy of tyre models depends to a large extent on the measurement data used to assess model parameters. The MF-Swift tyre model parameters can be identified or estimated from various combinations of experimental data. The amount and required accuracy of the measurement data can be selected according to the tyre model application. This...
article 2005
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Sobera, M.P. (author), Kleijn, C.R. (author), Brasser, P. (author), van den Akker, H.E.A. (author)
A multi-scale study of the performance of protective clothing has been performed by coupling various types of numerical simulation of flow, heat and mass transfer. From meso-scale Direct Numerical Simulation, it was found that the flow underneath the clothing is laminar and periodic, with a magnitude much smaller than the free stream velocity....
conference paper 2004
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