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A method for the triple decomposition of fluctuating velocity in a multiscale flow, suitable for a spatiotemporal data set, is presented. It is applied to experimental data gathered by means of particle image velocimetry (PIV). The basic properties of the decomposed parts are shown. The presented method is then used to perform a conditional...
conference paper 2015
document
Morales Velasquez, S. (author)
Multiple frameworks and procedures are used in organizations to analyse and assess risks in the most efficient way possible. COBIT, COSO or ISO as some of the most popular frameworks used to evaluate enterprise threats, but each of them offer an independent view on risks that are not the best solution for chains or well stablished organization...
master thesis 2015
document
We investigate the behavior of flows, including turbulent flows, driven by a horizontal body-force and subject to a vertical magnetic field, with the following question in mind: for very strong applied magnetic field, is the flow mostly two-dimensional, with remaining weak three-dimensional fluctuations, or does it become exactly 2D, with no...
conference paper 2015
document
The interaction between the large-scale velocity fluctuations (uL) and the small-scale velocity gradient phenomena, such as dissipation and the vortex stretching term, are examined in a turbulent free-shear flow. The difference between the probability density functions of these small-scale quantities conditioned on the sign of uL is quantified...
conference paper 2015
document
Overtoom, M.E. (author), Hekkert, P.P.M. (author)
Houses were among the first structures that were built, and remain the most common type of building today. The design of housing has been the subject of architecture, while from a psychological point of view the meaning of home has been a major subject of research. These two different viewpoints are combined in this research to provide a tool...
abstract 2015
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In the present abstract, DNS results obtained for turbulent plane Couette flow with wall-normal transpiration velocity are presented. Important equations valid in such a flow are derived, describing the total shear stress and the relation between the friction velocities at the lower and upper wall. These expressions are of importance, as there...
conference paper 2015
document
Turbulent secondary flow in straight open ducts with rectangular cross-section are studied numerically by means of pseudo- spectral direct numerical simulation (DNS). Similarly to the corresponding closed duct flows, the mean streamwise vorticity pattern in turbulent open duct flows were found to be the statistical footprint of the most probable...
conference paper 2015
document
The optimal transient growth process in a particle-laden channel flow is studied under the influence of the linear feedback control. The equilibrium Eulerian approach with the assumption that the particles are small and spherical is adopted. The effect of initial distribution of particles on the optimal transient growth of perturbations is...
conference paper 2015
document
Breedveld, S.C. (author)
Field hockey is a growing sport in the Netherlands, where both the male and female national squads belong amongst the best teams in the world. Field hockey requires a lot of technical capabilities from the player, which not all players possess. This sometimes leads to uncontrolled strikes of the ball, which can lead to accidents and injuries....
master thesis 2015
document
SCOPE Since 1986 the European Turbulence Conference (ETC) is held every other year with usually over 450 participants. The objective of the ETC is to provide a platform for scientists to present and discuss recent advances in the field of turbulence and related topics. TOPICS The principal topics of the ETC vary from fundamental physical issues...
conference 2015
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Stabilizing effects of wall oscillation on two dimensional (2D) Tollmein-Schlichting (TS) waves and oblique TS waves developing in 2D channel flow are numerically investigated using the Floquet method. It was shown from the previous study[1] that the wall oscillation mostly has stabilizing effect and then TS mode is occasionally more stable than...
conference paper 2015
document
To investigate streamwise variations of turbulence statistics in the wide range of the drag reduction ratio for the zero-pressure-gradient turbulent boundary layer flow due to the injection of drag-reducing nonionic surfactant solutions, we performed the laser-Doppler velocimetry (LDV) measurement at a new experimental apparatus with the larger...
conference paper 2015
document
Ding, J. (author), Van der A, R.J. (author), Mijling, B. (author), Levelt, P.F. (author), Hao, N. (author)
The Nanjing Government applied temporary environmental regulations to guarantee good air quality during the Youth Olympic Games (YOG) in 2014. We study the effect of those regulations by applying the emission estimate algorithm DECSO (Daily Emission estimates Constrained by Satellite Observations) to measurements of the Ozone Monitoring...
journal article 2015
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Vermaas, D.A. (author), Sassenburg, M. (author), Smith, W.A. (author)
Different pH requirements for a cathode and an anode result in a non-optimal performance for practical solar fuel systems. We present for the first time a photo-assisted water splitting device using a bipolar membrane, which allows a cathode to operate in an acidic electrolyte while the photoanode is in alkaline conditions. The bipolar membrane...
journal article 2015
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Voorendt, M.Z. (author)
lecture notes 2015
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Al-Kutubi, H. (author), Rassaei, L. (author), Olthuis, W. (author), Nelson, G.W. (author), Foord, J.S. (author), Holdway, P. (author), Carta, M. (author), Malpass-Evans, R. (author), McKeown, N.B. (author), Tsang, S.C. (author), Castaing, R. (author), Forder, T.R. (author), Jones, M.D. (author), He, D. (author), Marken, F. (author)
The highly rigid molecular structure of Polymers of Intrinsic Microporosity (PIM) – associated with a high thermolysis threshold – combined with the possibility to fill intrinsic micropores allows the direct “one-step” templated conversion of metal nitrates into nano-structured metal oxides. This is demonstrated here with PIM-EA-TB and with PIM...
journal article 2015
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Sippe, R. (author)
Big data is a broad term that is related to the collection, storage and analysis of large volumes of data. The term big data is often associated with the popular 3V’s model, which defined that data is growing significantly in the characteristics volume, variety and velocity. In this research we defined big data as: the collection, storage and...
master thesis 2015
document
Nizamoglu, A. (author)
The performance of high precision applications highly depend on the ability to reject mechanical disturbances. Extreme accuracies can only be achieved if the object can be isolated from its environment. Vibration isolation is the process of isolating an object from the source of vibration. In active vibration isolation, an entire instrument of...
master thesis 2015
document
Van der Beek, P.P. (author)
At the dawn of a large infrastructure replacement program in the Netherlands the question rises whether current forms of public-private partnerships in infrastructure projects are sufficient to deal with the complexities involved in large scale replacement of water infrastructure objects. It is stated that the concept of public private...
master thesis 2015
document
Kleijn, J. (author)
Feasibility study to the applicability of alternative fuels on chemical tankers. Only summary available because of confidentiality.
master thesis 2015
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