- document
-
Franz, Kelsey (author)Wind farm interactions with the surrounding airflow leads to a reduction in velocity greater than the linear sum of single turbine inductions and is known as global or upstream blockage. The mechanisms and magnitude of global blockage effect are not yet fully understood. Models to simulate upstream blockage to improve efficiency estimates and...master thesis 2022
- document
-
Kashyap, Pramod (author)Measurement campaigns and CFD simulations have recently identified a large-scale flow phenomenon called wind-farm flow blockage. This is found to bear a significant and far-reaching reduction in wind speed upstream of a wind farm. The wind farm blockage is attributed to the cumulative induction effects of multiple wind turbines placed in series....master thesis 2022
- document
-
Rosin, T. R. (author), Kapelan, Z. (author), Keedwell, E. (author), Romano, M. (author)Blockages are a major issue for wastewater utilities around the world, causing loss of service, environmental pollution, and significant cleanup costs. Increasing telemetry in combined sewer overflows (CSOs) provides the opportunity for near real-time data-driven modelling of wastewater networks. This paper presents a novel methodology,...journal article 2022
- document
-
van Til, Justin (author)This thesis research is set up to increase the knowledge on the influence of atmospheric stability on the Global Blockage Effect (GBE) of offshore wind farm flows, thereby aiming to improve the accuracy of energy yield calculations and predictions of offshore wind farms.master thesis 2021
- document
-
Sivanandan, Hrishikesh (author)The present work studies the impact of self-induced Atmospheric Gravity Waves (AGWs) excited by an moderately sized offshore wind farm immersed in a Conventionally Neutral Boundary Layer (CNBL). A wind farm of finite span-wise length, consisting of 25 NREL 15MW wind turbines laid out in (5 X 5 Aligned manner) is considered. In order to achieve...master thesis 2021
- document
-
Kizhakkekundil, Sandra (author), Morais, Joao (author), Braam, Sjors (author), Litjens, R. (author)With the recent adoption of millimeter-wave spectrum in cellular communications, deployment of active antenna arrays and use of beamforming become vital to compensate for the increased path loss. However, directional high-frequency signals may suffer heavy attenuations due to blockage effects. Therefore, blockage modelling that adequately...journal article 2021
- document
-
Timmer, W.A. (author)A relatively simple method is presented to predict the maximum two-dimensional drag coefficient of an airfoil only using its shape. The method is based on a contribution related to the leading edge thickness in terms of the y/c coordinate at x/c=0.0125 and a contribution related to the trailing edge flow angle which appears also to be...journal article 2020
- document
-
Beysens, Jona (author), Wang, Q. (author), Pollin, Sofie (author)Visible Light Communication (VLC) has attracted significant attention over the past decade. Although numerous research studies have been performed to improve the data rate of VLC links, an important fact has been largely neglected: human bodies that host VLC receivers could block their Line-of-Sight (LOS) downlinks, and thus, degrade the system...journal article 2020
- document
-
Petersson, Louise (author), ten Veldhuis, Marie-claire (author), Verhoeven, Govert (author), Kapelan, Z. (author), Maholi, Innocent (author), Winsemius, H.C. (author)In this paper we demonstrate a framework for urban flood modeling with community mapped data, particularly suited for flood risk management in data-scarce environments. The framework comprises three principal stages: data acquisition with survey design and quality assurance, model development and model implementation for flood prediction. We...journal article 2020
- document
-
Cui, Minhao (author), Wang, Q. (author), Xiong, Jie (author)Visible Light Communication (VLC) is a promising technology for future wireless communications. By modulating the visible light - -that has about 10,000x larger frequency band than that of radios - -to transmit data, VLC has the potential to provide ultra-high-speed wireless connectivities. However, it also has limitations such as i)...conference paper 2020
- document
-
Vermes, A.G. (author)With heavy duty propulsion systems under development for upcoming Mars missions, such as the Space Launch System and the Interplanetary Spaceship, the stability of high-performance liquid-propellant rocket engines is of renewed interest. High-power-density rocket turbopumps forward pressurized fuel to the combustor at high rates. Turbopumps...master thesis 2017
- document
-
Hersyandika, R. (author)The massive availability of bandwidth in the millimeter wave (mmWave) frequency band has the potential to address the challenges posed by the unprecedented increase in the mobile data traffic. Therefore, mmWave wireless access is being seen as a promising candidate for multi-Gbps wireless access in the next generation (i.e., 5G) of wireless...master thesis 2016
- document
-
Post, J.A.B. (author), Langeveld, J.G. (author), Clemens, F.H.L.R. (author)The performance of lateral house connections has a direct impact on sewer serviceability. Despite the potential consequences of a blockage, these components are generally maintained with a reactive approach. As inspection data on the condition of lateral house connections are scarce, this study adopts a statistical procedure to support...journal article 2016
- document
-
Post, J.A.B. (author), Pothof, I.W.M. (author), Dirksen, J. (author), Baars, E. J. (author), Langeveld, J.G. (author), Clemens, F.H.L.R. (author)Gully pots are essential assets designed to relief the downstream system by trapping solids and attached pollutants suspended in runoff. This study applied a methodology to develop a quantitative gully pot sedimentation and blockage model. To this end, sediment bed level time series from 300 gully pots, spanning 15 months, were collected. A...journal article 2016
- document
-
De Groot, A.C. (author)In Amsterdam, over 200 so called inverted siphons are situated. As these siphons are prone for blockages, it is key that these parts of a sewer system are maintained proactively. This article outlines the basis of a methodology that can be used to estimate the fouling degree of sewers with the use of water level measurements. Even though the...master thesis 2015
- document
-
Goossens, S.J. (author)The market share of wind energy is related to many factors, including politics, social acceptance and financial feasibility. In light of reducing the Levelised Energy Cost (LEC) generated from wind energy, power company Vattenfall is continuously looking for new ways of monitoring and improving wind turbine yield. Recent publications have shown...master thesis 2015
- document
-
Post, J.A.B. (author), Pothof, I.W.M. (author), Ten Veldhuis, J.A.E. (author), Langeveld, J.G. (author), Clemens, F.H.L.R. (author)It remains unknown how lateral house connections affect the performance of the sewer system, since the assessment of serviceability is mainly based on the state of the main sewer system. Further insight into the contribution of lateral house connections to the overall level of service provided can aid to target investments to parts of the system...conference paper 2014
- document
-
Van Grunsven, F. (author)This report concerns the experimental validation of recent numerical predictions of pipe blockage during the vertical hydraulic transport of ore for the deep sea mining industry. A hydraulic circuit, incorporating an 8.5 m riser pipe of 99.4 mm inner diameter, was built to identify and quantify the dominant transport mechanisms during conveying,...master thesis 2014
- document
- Talmon, A.M. (author) journal article 2014