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Tummers, M.J. (author), Schenker, M.C. (author), Delfos, R. (author), Twerda, A. (author), Westerweel, J. (author)
Measurements were conducted in the fully developed turbulent flow in a pipe with internal diameter D at a Reynolds number of Re <sub>D</sub>= 1.6 × 10 <sup>5</sup> . The pipe walls were equipped with regularly spaced square ribs of relative height h/ D= 0.154 , while the pitch-to-roughness height was varied between p/ h= 1.67 and p/ h= 6.67 ....
journal article 2023
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Greidanus, A.J. (author), Delfos, R. (author), Picken, S.J. (author), Westerweel, J. (author)
The interaction between a turbulent boundary layer flow and compliant surfaces is investigated experimentally. Three viscoelastic coatings with different material stiffnesses are used to identify the general surface response to the turbulent flow conditions. For the softest coating, the global force measurements show two obvious regimes of...
journal article 2022
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Delfos, J. (author), Zuiderwijk-van Eijk, A.M.G. (author), van Cranenburgh, S. (author), Chorus, C.G. (author)
As the application of machine learning (ML) algorithms becomes more widespread, governmental organisations try to benefit from this technology. While ML has the potential to support public services, its application also introduces challenges. Several scholars have described the possible opportunities and challenges of ML applications in the...
conference paper 2022
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Tokgoz, S. (author), Elsinga, G.E. (author), Delfos, R. (author), Westerweel, J. (author)
We report on the experimental investigation of the large-scale instantaneous flow structures in turbulent Taylor–Couette flow using tomographic particle image velocimetry. The results indicate three distinct regimes for counter-rotating flow within a shear Reynolds number range of 11000&lt;ReS&lt;47000 . Close to only inner cylinder rotation,...
journal article 2020
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Delfos, Sander (author), Granneman, Erik (author)
This report describes the design and implementation of an interface subsystem for a fall detection system using a pressure based floor sensor. The goal of the fall detection system is to detect and alarm when an elderly person has fallen. The subsystem covers communication between hardware and software, using the WiFi protocol MQTT. The...
bachelor thesis 2019
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Benschop, H.O.G. (author), Greidanus, A.J. (author), Delfos, R. (author), Westerweel, J. (author), Breugem, W.P. (author)
We investigate the deformation of a linear viscoelastic compliant coating in a turbulent flow for a wide range of coating parameters. A one-way coupling model is proposed in which the turbulent surface stresses are expressed as a sum of streamwise-travelling waves with amplitudes determined from the stress spectra of the corresponding flow...
journal article 2019
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Delfos, Jeroen (author)
In this report an analysis is presented on the impacts of weather codes on travel behavior. Loop detector data of seven segments in different provinces in the Netherlands are analyzed with regression models with autoregressive errors. Weather codes were found to be significantly influencing travel demand. Particularly codes orange for...
master thesis 2018
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Delfos, Marleen (author)
Towards 2030, the amount of single households of 65 years and older will double to 40 percent. Due to changes in the political environment elderly can only move to a nursing home if the demand of care is high enough. Consequently, there will be a bigger group of elderly that needs to live longer independently in their urban neighborhood. In the...
master thesis 2018
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Bandinu, Giacomo (author), Barendsen, Lot (author), Delfos, Jeroen (author), Janse, Arnout (author), Overtoom, Irene (author)
The goal of this project is to develop a design for Dala’s water system that deals with challenges of the township in a sustainable way. Dala is a township of Yangon, Myanmar’s economic centre. It is located directly South of the central business district (CBD), across the Yangon river. The area is now largely underdeveloped, but in 2021 it will...
student report 2017
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Delfos, R. (author)
Stromingsleer is de naam van het vakgebied dat ‘stromende media’ beschrijft. Dat medium kan lucht of water zijn, maar ook olie, mayonaise, of lucht-watermengsels. Als we het vakgebied wat ruimer nemen dan stromen zand- of suikerkorrels ook. Kortom, alles stroomt, of zoals Heraclitus het rond 500 vóór Christus verwoordde: ‘Panta Rhei’. En dat is...
book chapter 2017
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Delfos, B. (author)
Eight million tons of plastic enters the ocean every year, causing damage to the environment, to human health, and to the economy. Due to rotating currents, called 'Gyres', large quantities of that debris accumulate in five areas around the world. In an attempt to clean up the most polluted area, being the Great Pacific Garbage Patch, Boyan Slat...
master thesis 2016
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Greidanus, A.J. (author), Delfos, R. (author), Westerweel, J. (author)
The flow motions in the turbulent boundary layer between water and a rowing boat initiate a turbulent skin friction. Reducing this skin friction results in better rowing performances. A Taylor-Couette (TC) facility was used to verify the power losses due to velocity fluctuations P<sub>V′</sub> in relation to the total power, as a function of...
conference paper 2016
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Alidai, A. (author), Greidanus, A.J. (author), Delfos, R. (author), Westerweel, J. (author)
The transition from the laminar to the turbulent regime in linearly stable shear flows, for example, pipe and plane Couette flows, occurs abruptly with no precursor. The evolution of turbulent spots has been studied to better understand the dynamics of this transition and the onset of turbulence. These studies have mostly focused on pipe flows...
journal article 2015
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In linearly stable shear flows like pipe and plane Couette flows, the transition from the laminar to the turbulent regime occurs abruptly. To better understand this transition, the time evolution of turbulent patches, created by controlled finite amplitude perturbations, have been studied in the literature. These studies mostly focused on pipe flows...
conference paper 2015
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Alidai, A. (author), Delfos, R. (author)
In linearly stable shear ?ows like pipe and plane Couette ?ows, the transition from the laminar to the turbulent regime occurs abruptly. To better understand this transition, the time evolution of turbulent patches, created by controlled ?nite amplitude perturbations, have been studied in the literature. These studies mostly focused on pipe ?ows...
conference paper 2015
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Friction measurements were performed in a Taylor-Couette setup. Drag reduction was obtained with a riblet surface and indicated a drag reduction for a wide range of shear Reynolds numbers, with a maximum of 5.3% at Re_s=47000 (s+=14). Tomographic PIV verified that the friction coefficients are strongly related to the flow regimes and structures....
conference paper 2015
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Greidanus, A. (author), Delfos, R. (author), Tokgoz, S. (author), Westerweel, J. (author)
Friction measurements were performed in a Taylor-Couette setup. Drag reduction was obtained with a riblet surface and indicated a drag reduction for a wide range of shear Reynolds numbers, with a maximum of 5.3% at Re_s=47000 (s+=14). Tomographic PIV verified that the friction coefficients are strongly related to the flow regimes and structures....
conference paper 2015
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Greidanus, A.J. (author), Delfos, R. (author), Tokgoz, S. (author), Westerweel, J. (author)
A Taylor–Couette facility was used to measure the drag reduction of a riblet surface on the inner cylinder. The drag on the surfaces of the inner and outer cylinders is determined from the measured torque when the cylinders are in exact counter-rotation. The three velocity components in the instantaneous flow field were obtained by tomographic...
journal article 2015
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Greidanus, A.J. (author), Delfos, R. (author), Tokgoez, S. (author), Westerweel, J. (author)
Low drag surfaces are often desired in many industries with applications in open and closed channel flows, such as ship hulls and pipe flows. Drag reduction is a phenomenon that can have substantial energy savings, resulting in ecological and economical benefits. We use a Taylor-Couette facility as experimental instrument to measure the drag...
conference paper 2015
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Delfos, R.J. (author)
This report contains the process and the results of the graduation project of Ricco Delfos, performed for the company Athletic Skills Method. The title of the project is: Adaptaball - The design of a product to train the adaptability of football players In the past football players trained in general on natural turf pitch, and nowadays mostly on...
master thesis 2014
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