document

Investigating the role of spatial thinking in children’s design ideation through an open-ended design-by-analogy challenge

Zhu, C. (author), Klapwijk, R.M. (author), Silva-Ordaz, Miroslava (author), Spandaw, J.G. (author), de Vries, M.J. (author)

Spatial thinking is ubiquitous in design. Design education across all age groups encompasses a range of spatially challenging activities, such as forming and modifying mental representations of ideas, and visualizing the scenarios of design prototypes being used. While extensive research has examined the cognitive processes of spatial...

journal article 2024

document

Immersed Divergence-Conforming Finite Element Spaces

Sindy, Ferhat (author)

Computational Fluid Dynamics (CFD) offers numerous benefits, notably the ability to study flows that are challenging or costly to investigate using experiments. A central challenge in CFD lies in simulating fluid flow around complex geometries. Additionally, the governing equations follow conservation laws. This thesis aims to establish the...

master thesis 2023

document

COVID-19 Impact on the Oil and Gas Industry NO₂ Emissions: A Case Study of the Permian Basin

Serrano Calvo, R. (author), Veefkind, j. Pepijn (author), Dix, Barbara (author), de Gouw, Joost (author), Levelt, Pieternel Felicitas (author)

COVID-19 caused a historic collapse in fossil fuel demand, a general decline in economic activity, and hydrocarbon price volatility. This resulted in an unprecedented scenario to evaluate the contribution of the O&G (Oil and Gas) industry NO₂ (nitrogen dioxide) emissions in the Permian basin (United States), currently the...

journal article 2023

document

The Flux Divergence Method Applied to Nitrogen Emissions in The Netherlands

Bryan, Lotte (author)

Emission of ammonia and nitrogen oxides puts pressure on vulnerable ecosystems in The Netherlands. Satellite data from TROPOMI and CrIS gives vertical column density (VCD) maps for nitrogen dioxide and ammonia respectively. The Flux-Divergence method converts a VCD map to an emission map, by temporally averaging the divergence of the flux of the...

master thesis 2022

document

High Resolution Model-Independent Carbon Monoxide Emission Localization and Characterization Using TROPOMI

Foorthuis, Lodewijck (author)

master thesis 2022

document

Isogeometric analysis of fluid cellular membranes: Application of discrete exterior calculus and isogeometric analysis to Stokes flow on time-evolving surfaces

Bosma, Douwe (author)

An isogeometric finite element method for incompressible fluid film equations is presented. The method can be applied to numerically model the behaviour of thin cellular membranes, such as lipid bilayers. The membranes are represented by infinitely thin closed surfaces. Both the surface parametrization and analysis are based on state-of-the-art...

master thesis 2022

document

Turning Maneuver Prediction of Connected Vehicles at Signalized Intersections: A Dictionary Learning-Based Approach

Zhang, H. (author), Fu, Rui (author), Wang, Chang (author), Guo, Yingshi (author), Yuan, W. (author)

Vehicle-to-Infrastructure (V2I) communication has provided a solution for the improvement of the traffic efficiency of smart city intersections. For example, turning maneuvers prediction at signalized intersections in a connected environment helps traffic command centers time traffic lights and dynamically predict traffic flow. However, the...

journal article 2022

document

Expansions in the Non-Ideal Compressible Flow Regime: A Numerical and Experimental Study

Hariharan, Gayathri (author)

Organic Rankine Cycle systems are gaining increasing attention as a modular, cost-effective and decentralised thermal energy recovery solution. The design of an efficient expander in the ORC system is crucial to its rapid uptake by the industry. Compared to volumetric expanders, a radial turbine provides advantages in terms of flexibility and...

master thesis 2021

document

Distributed Acoustic Sensing: Exploring the potential of unconventional fiber configurations

Kiers, Tjeerd (author)

Over the last decade, Distributed Acoustic Sensing (DAS) has gained increased attention as a cost-effective and practical ground motion monitoring technique, due to the unprecedented temporal and spatial sampling possibilities. Considering these inherent advantages, DAS-collected strain rate measurements can be beneficial as...

master thesis 2021

document

Pressure-Driven Nitrogen Flow in Divergent Microchannels with Isothermal Walls

Ebrahimi, Amin (author), Shahabi, Vahid (author), Roohi, Ehsan (author)

Gas flow and heat transfer in confined geometries at micro-and nanoscales differ considerably from those at macro-scales, mainly due to nonequilibrium effects such as velocity slip and temperature jump. Nonequilibrium effects increase with a decrease in the characteristic length-scale of the fluid flow or the gas density, leading to the failure...

journal article 2021

document

A New Divergence Method to Quantify Methane Emissions Using Observations of Sentinel-5P TROPOMI

Liu, Mengyao (author), van der A, Ronald (author), van Weele, Michiel (author), Eskes, Henk (author), Lu, Xiao (author), Veefkind, j. Pepijn (author), de Laat, Jos (author), Kong, Hao (author), Wang, Jingxu (author)

We present a new divergence method to estimated methane (CH₄) emissions from satellite observed mean mixing ratio of methane (XCH₄) by deriving the regional enhancement of XCH₄ in the Planetary Boundary Layer (PBL). The applicability is proven by comparing the estimated emissions with its known emission...

journal article 2021

document

A Bound on Ekman Pumping

de Roode, S.R. (author), Siebesma, A.P. (author)

Momentum transport by boundary layer turbulence causes a weak synoptic-scale vertical motion. The classical textbook solution for the strength of this Ekman pumping depends on the curl of the surface momentum flux. A new solution for Ekman pumping is derived in terms of the curl of the geostrophic wind and a term that depends in a nontrivial...

journal article 2020

document

Dynamic and interactive re-formulation of multi-objective optimization problems for conceptual architectural design exploration

Yang, D. (author), Di Stefano, Danilo (author), Turrin, M. (author), Sariyildiz, I.S. (author), Sun, Yimin (author)

Simulation-Based Multi-Objective Optimization (SBMOO) methods are being increasingly used in conceptual architectural design. They mostly focus on the solving, rather than the re-formulation, of a Multi-Objective Optimization (MOO) problem. However, Optimization Problem Re-Formulation (Re-OPF) is necessary for treating ill-defined conceptual...

journal article 2020

document

Towards constructive design feedback dialogues: guiding peer and client feedback to stimulate children’s creative thinking

Schut, A. (author), van Mechelen, M.P.P. (author), Klapwijk, R.M. (author), Gielen, M.A. (author), de Vries, M.J. (author)

Design feedback is an essential pedagogical tool that can help young novice designers navigate divergent and convergent paths while designing. However, design feedback is often met with resistance, which counteracts its potential to help novice designers evaluate their design and generate new solution directions. In this paper, we report on...

journal article 2020

document

Accuracy aspects of conventional discretization methods for scalar transport with nonzero divergence velocity field arising from the energy balance equation

Zijlema, Marcel (author)

We are concerned with the numerical solution of a linear transport problem with nonzero divergence velocity field that originates from the spectral energy balance equation describing the evolution of wind waves and swells in coastal seas. The discretization error of the commonly used first-order upwind finite difference and first-order vertex...

journal article 2020

document

Uncovering early indicators of fixation during the concept development stage of children’s design processes

Schut, A. (author), Klapwijk, R.M. (author), Gielen, M.A. (author), van Doorn, Fenne (author), de Vries, M.J. (author)

In this paper, we explore the early indicators of design fixation occurring during the concept development stage of children’s design processes. This type of fixation, which we named: concept fixation, causes a blind adherence to the current (possibly unfavourable) state of a design idea. Its occurrence hampers the creative thinking processes...

journal article 2019

document

Optimization of in-depth divergence strategies

Sangers, Marvin (author)

This study discusses the potential of the in-depth water diversion (IDD) process to enhance oil recovery from subsurface reservoirs and investigates IDD strategies through an ensemble optimization approach. Pilot studies in the North Sea performed in recent years have shown that Sodium Silicate can be applied as blocking agent, diverting water...

master thesis 2018

document

Effects of Convergent and Divergent Feedback on Creative Thinking During Children’s Design Processes

Schut, A. (author), Klapwijk, R.M. (author), Gielen, M.A. (author)

This paper explores patterns in the feedback preceding instances of design fixation in children (age 9 to 11) carrying out a co-design project. Our goal is to find ways to improve the early mastering of their divergent (DT) and convergent thinking (CT) skills, which in turn will help the children to develop their creative abilities. Previous...

conference paper 2018

document

Experimental investigation of flutter boundary with controlled vibration levels

Sodja, J. (author), Roizner, Federico (author), De Breuker, R. (author), Karpel, M. (author)

The first experimental application of the Parametric Flutter Margin method for identification of aeroelastic instabilities is presented. The experiment was performed in two steps using a two degree-of-freedom wing model mounted in the wind tunnel. First, the reference flutter and divergence conditions were found by increasing the airstream...

conference paper 2017

document

Seasonal dependence of northern high-latitude upper thermospheric winds: A quiet time climatological study based on ground-based and space-based measurements

Dhadly, Manbharat (author), Emmert, John (author), Drob, Douglas (author), Conde, Mark (author), Doornbos, E.N. (author), Shepherd, Gordon (author), Makela, Jonathan (author), Wu, Qian (author), Niciejewski, Rick (author), Ridley, Aaron (author)

This paper investigates the large-scale seasonal dependence of geomagnetically quiet time, northern high-latitude F region thermospheric winds by combining extensive observations from eight ground-based (optical remote sensing) and three space-based (optical remote sensing and in situ) instruments. To provide a comprehensive picture of the...

journal article 2017