bluuebunny/crossref_metadata_2025_split huggingface dataset:
Blade research and demonstration platform
Authors: Haselbach Philipp U. , Zahle Frederik , Berring Peter , Semenov Sergei , Voltá Laura , Roqueta I , Robert Verelst David 
Published: September 2020

Abstract
At DTU Wind Energy, a 12.6 m reference wind turbine rotor blade and the corresponding blade moulds were designed and manufactured. The entire blade design and the related test data will be published according to the FAIR principles. The blade moulds are intended to serve as a blade research and demonstration platform, allowing to realise theoretical concepts and testing these in full-scale on a wind turbine blade and thus enabling a comparison to numerical solutions. In this article, the preliminary blade design progress and process, initial load calculations and a 3D scan of the blade molds are presented.
Investigations of active boundary layer control using DDES
Authors: Rumpf Andreas , Bangga Galih 
Published: September 2020

Abstract
The root area of a wind turbine rotor is usually constructed by very thick airfoils with a relative thickness of more than 35%. An airfoil at that thickness is characterized with strong flow separation. To solve this issue, vortex generators can be used as an active control in order to stabilize the airflow and improve the aerodynamic performance, consequently. Boundary layer control however, investigated employing numerical techniques, strongly depend on the employed method as well as the mesh especially due to a weak vortex conservation in the RANS model. Using the method of Delayed detached eddy simulation (DDES) the solution can benefit from effort-efficient boundary layer modeling as well as LES vortex resolving apart from the surface. The present studies aims to investigate suitable numerical approach mesh dependencies in comparison to experimental data, for application to thick airfoil in future studies.
A comparative study of wake interactions between wind-aligned and yawed wind turbines using LES and actuator line models
Authors: Onel Huseyin C. , Tuncer Ismail H. 
Published: September 2020

Abstract
An LES based OpenFOAM solver is coupled with the actuator line model for the simulation of wind farms and the prediction of power production. The tool developed is validated for wind aligned and yawed tandem wind turbines. Two NREL 5MW turbines in a tandem configuration are considered. The solution parameters are first studied in detail. The development of vortical wakes behind the upstream and the downstream turbines are simulated under uniform and atmospheric boundary layer inflow conditions, and the power productions of the turbines are predicted. The impact of a yawed upstream rotor on its wake deflection and the resulting power production of the tandem configuration are assessed. It is shown that the coupled solver developed is quite successful in capturing the wake deficits and wake deflections, and predicting the power production of tandem wind turbine configurations.
CFD Prediction of Tip Vortex Aging in the Wake of a Multi-MW Wind Turbine
Authors: Cormier Marion , Bühler Manuel , Mauz Moritz , Lutz Thorsten , Bange Jens , Krämer Ewald 
Published: September 2020

Abstract
In the present study, prediction from high-fidelity Computational Fluid Dynamics (CFD) simulations of the tip vortex aging in the near-wake of a multi-MW wind turbine is evaluated and compared to in-situ measurements as well as results of a semi-empirical model. Optimized tip vortex refinement is also introduced to investigate the influence of the grid topology on the vortex evolution. The grid refinement affects only the vortex core size and a reduction of the core radius by a factor of 3.4 was achieved with the chosen parameters. On the refined setup, vortex core sizes and strength are comparable with in-situ Unmanned Aircraft System (UAS) based measurements at 0.5 rotor radius downstream of the wind turbine. A comparison of the aging function with a semi-empirical vortex helix model shows a good agreement with the refined CFD results, but the core size predicted by the model is smaller than in simulations and experiments.
Method for the generation of stochastic wind fields fitted to measurement data in real-time
Authors: Thomas Philipp , Szyslo Tom 
Published: September 2020

Abstract
The excitation of the wind turbine by the wind represents one of the main sources of excitation for the components of the wind turbine. The resulting structural loads can be measured relatively easily. The measurement of wind excitation, however, is much more complex. Even with the latest measuring equipment, such as LiDAR, the spatially and temporally high-resolution wind measurement required for the validation of the load measurement in the time domain can only be realized with a disproportionately high financial outlay and is thus unsuitable for large-scale application in the field. The method presented here shall be able to generate a realistic spatial wind excitation by means of the measured wind information present at each wind turbine, thus enabling model and load validation in the time domain. Furthermore, the method is fast enough to calculate the wind excitation in real time, allowing for application in Hardware-in-Loop or as part of a digital twin of the wind turbine.
On the multi-scale turbulent structure interactions within wind farms
Authors: Liu Huiwen , Zhao Zhenzhou , Chamorro Leonardo P. , Hayat Imran , Jin Yaqing , Zheng Yuan 
Published: September 2020

Abstract
The quantification of the scale-by-scale interaction of multi-wakes and background flow is required to estimate turbines behaviour within wind farms. The paper provides insight on the evolution of multi-scale turbulence of a model wind farm operating in turbulent boundary layer. The wind farm configured with aligned turbines set at streamwise spacing between units of 5 diameters by spanwise spacing of 2.5 diameters, corresponding to an array of 8x3 turbines. Howtwire anemometry was used to acquire high-resolution measurements of streamwise velocity fluctuations at various locations. Experimental results suggest that the contribution of multi-scale turbulence structures to the kinetic energy of the wake is highly dependent on the location inside the wind farm, the evolution is significantly modulated by turbine rotation, wake interactions and outer flow, large scale motions mainly dominate outer and far wakes, while small scales are popular in inner and near wakes.
Multiphysics simulations of the dynamic and wakes of a floating Vertical Axis Wind Turbine
Authors: Balty P , Caprace D-G , Waucquez J , Coquelet M , Chatelain P 
Published: September 2020

Abstract
A framework performing Large Eddy Simulations of the flow past Floating Offshore Vertical Axis Wind Turbines (FOVAWT) mounted on semi-submersible platforms is presented. The simulation tool captures the unsteady flow and the resolved 6-DOF motion of the system. A state-of-the-art vortex particle-mesh method solves the aerodynamics and wakes of the turbines. The hydrodynamic loads are accounted for via the relative form of the Morison’s equations while the mooring lines tension is computed through a lumped-mass model. Realistic conditions are further obtained by introducing a sheared turbulent inflow and erratic waves in a simulation domain that extends ten diameters downstream of the machine. First, analyses of an isolated FOVAWT wake and motion are performed and the impact of prominent environmental phenomena is assessed. In a second step, the interactions of two FOVAWTs throughout their wakes are studied. In general, the incoming wake signature induces larger oscillation of the downstream machine, alters the shape of the wakes and shortened the transition to turbulence.
Wind farm flow reconstruction and prediction from high frequency SCADA Data
Authors: Rott Andreas , Petrović Vlaho , Kühn Martin 
Published: September 2020

Abstract
The flow inside a typical large wind from propagates through the array from turbine to turbine. We present an algorithm that intuitively processes measured values from as much as possible turbines in real-time and uses them to determine a flow reconstruction and minute-scale forecast for the downstream turbines. For the validation we used full-field measurements from the offshore wind farm Global Tech I. The flow reconstruction is compared to the measurements of one turbine, which was excluded from the algorithm and achieved a root mean square error of 0.55 ms−1 for the wind speed estimation. The flow forecasting is tested for three prediction horizons 30s, 60s and 120s. Together with automated error correction to account for calibration errors and wake effects, the flow prediction achieves a root mean square error of 0.52 ms−1 for the 120s-forecast of the wind speed, which beats the persistence forecasting method. The reconstruction allows to analyse the flow in the wind farm, to detect abnormal turbine behaviour and to estimate fatigue loads, and the minute-scale forecasting is a useful tool for predictive wind farm control and estimating the available power of a wind farm, which becomes more and more necessary for grid stability.
Effect of thrust coefficient on the flow blockage effects in closely-spaced spanwise-infinite turbine arrays
Authors: Strickland Jessica M. I. , Stevens Richard J. A. M. 
Published: September 2020

Abstract
The performance of a wind turbine within an array is not necessarily equivalent to the performance of a free-standing turbine because the presence of the neighboring turbines influences the incoming flow. However, insight into these blockage effects is still lacking. Here, we use large eddy simulations to investigate how the blockage effect depends on the turbine thrust coefficient CT
. We consider three main scenarios: a free-standing turbine, a closely-spaced spanwise-infinite row of turbines, and an entire wind farm with a high turbine density. We observe that the power production of turbines in the row increases approximately linearly with

C

T

′

when compared to the production of a free-standing turbine. Here,

C

T

′

=

C
T

/

(
1

−

a
)

2

where a is the induction factor. In contrast, the power output of turbines in the first row of a wind farm decreases approximately linearly with CT
when compared to the production of turbines in a corresponding, solitary row.
The effect of urban tourism on an urban economy (the case of Malang Municipality)
Authors: Nurfitriya I D , Iskandar D A 
Published: September 2020

Abstract
As the economy of cities grew at unprecedented rate, urbanites’ changing perceptions of the way they see urban space – the city as an entertainment machine – creates a challenge that becomes the background for this study. Malang urbanized area is chosen as the unit of observation due to its potentials as the site for urban tourism development. New tourism icons and economic activities continue to emerge which begs the question as to why such things exist in Malang. Primary and secondary data are garnered through field observation, in-depth interview and from government policy related to tourism development. Mixed method is employed to reveal the effects of tourism sector development on the economic growth of the city. The findings indicate strong correlation between the two; however, cautionary note should be taken as there are many external factors beyond tourism sector development which affect the economic growth of Malang urban area during the observed period. Culinary activities create direct impact as seen through the increase of locally-owned revenues while thematic neighbourhood tourism development affects the local economy and informal sector.
Spatial patterns of land prices changing around toll gates (Cipali Toll Road case study)
Authors: Fakhruddin A , Nurlambang T , Sumadio W 
Published: September 2020

AbstractToll road construction has been carried out and has had an direct and indirect economic impact, which applies to Cipali Toll Road as well. High economic activities, growth of new facilities, and land use changes around this toll road are signs of new economic activities. New economic activity centers have triggered an increase in land prices in the surrounding area. The objective of this study is to determine the land use price changes along the Cipali Toll Road and understand the factors that influence it, namely the economic activity, distance from the toll road gate, land status, and land use. Data were collected by interviewing key informants from formal agencies and the communities as well. Using overlay technic between land price changes and factors that influence it, the result shows that land price changes did not happen in all areas around the toll road in the same way. Changes in land price also vary. The factor that influences land price changes is the distance from the toll road gate. This result was supported by Pearson Product Moment analysis. The conclusion of this study shows that land price changes in areas that have urban characteristics.
Migration and rural development: The impact of remittance
Authors: Hidayati I 
Published: September 2020

Abstract
In Indonesia rural society, remittance sent to families is more economical and routine since it is used to meet the families’ life necessities, education, and health, as well as to support the life necessities of whom are taking care of the family during the migrants are in destination areas. Remittances sent to families in migrants’ homelands are ideally using for production and investment activities. This usage of remittances gives a positive impact on homelands development, especially can be seen clearly in rural areas. This research will consider the relationship of remittance and rural development. The data collected included qualitative data from in-depth interviews and supported by study works of literature. Expectations of this research are remittances from migrants will improve rural development. This research showed that remittance is not only eagerly by migrants’ families, but also giving advantages for their homelands. Improvement of rural economy will strengthen the national economy and development.
Optimization of waste management in developing countries with spatial approaches (Study case: Depok City and Curitiba City)
Authors: Amri S , Soesilo T E B. , Martono D N , Supriatna  
Published: September 2020

Abstract
Waste management is a challenge for city authorities in developing countries especially due to increase of waste. The burden that is incurred on the city budget as a result of the high costs associated with its management and lack of understanding of the diversity of factors that influence the various stages of management. Comparative and descriptive analysis are utilized in this paper to observe the differences that arise at various levels of the administration so that they can be analysed. Data are collected from journal publications starting in 2013-2019. This paper compares how the handling of waste management has used a spatial approach starting from the Asian, Indonesian, and Depok levels. The purpose of this research is to find out what areas of waste management can be solved by spatial approaches, and recommendations for solutions that can be applied to the Depok City based on success story in other countries or regions. The Depok City already has a community-based approach that runs the trash bank. However, the waste bank is still ineffective, despite the low level of waste collection in Depok City. The optimization of waste management in Depok City can be improved its accuracy using spatial approach.
Analysis of groundwater recharge zone using remote sensing method in Bayah Region
Authors: Maghribi A A , Supriatna  
Published: September 2020

Abstract
Groundwater is one of the most important natural resources. Based on population needs, groundwater use meets around 60% for irrigation, industry, drinking water, sanitary facilities, etc. Based on data from the DESDM of Banten Province (2016), the Bayah Sub district area belongs to a small productive aquifer and rare underground water. With the development of in the Bayah region, it will be necessary to have a spatial with environmental insight. One of the important things in determining environmentally planning is by determining groundwater recharge areas in the area. The method used in this study is the Remote Sensing method. Data sources which used here is geological maps, DEMNAS imagery, Landsat-8 imagery, Landsat-5 TM imagery, Bayah rainfall stations. These data are processed using GIS to produce thematic maps such as lithology maps, land cover, lineament density, drainage density, rainfall, slope, and geomorphology. Scoring of all thematic maps is done using the multi-criteria evaluation / analysis method based on the superiority of each thematic map and the data in the thematic map itself on groundwater recharge value. The results of scoring on each thematic map are then overlaid on each thematic map to produce a map of potential groundwater recharge. According to this study the research can conclude that remote sensing and multi criteria evaluation can effectively use for finding groundwater recharge potential by using those 7 thematic maps. The study area mostly has high value groundwater potential recharge (2-3) which is 109,17 km2 and 77% of the study area.
The relationship of Cilutung River Flood hydrograph pattern with spatial rainfall during rainy season
Authors: Khairunnisa N , Kusratmoko E 
Published: September 2020

Abstract
Rainfall is an input in the hydrological system that delivers the output in the river flow in the form of discharge flow. The Cilutung River is a subsidiary of Cimanuk which has a greater function is to become one of the flood controllers in the area of Muara Cimanuk after Cimanuk in the dammed. This research aims to identify the pattern of flood hydrographs and to know the relationship between the flood hydrograph pattern with rainfall spatial variation in Cilutung river flow with variable rainfall and debit as well as spatial analysis Descriptive and statistical. The flood hydrograph pattern is related to the rainfall in which if the rainfall occurring in the Cilutung river flow is getting higher it will result in a higher flow discharge and form an increasingly high flood hydrograph pattern as well. It is supported by the incidence of 22 samples studied, spatial when the rain falls first in the upper part of Cilutung River basin and accompanied by rainfall and high intensity and a relatively long time will affect the hydrograph pattern The flood that has the highest debit value is getting higher and the higher the discharge volume also or vice versa. This relationship is reinforced by a correlation test result where there is a strong link between the maximum discharge and total discharge with rainfall and rain intensity. This relationship shows the flood hydrograph pattern has a strong correlation with the spatial pattern of rainfall.
Spatial assessment of land use impacts on bio-physico-chemical parameter gradients along Blanakan River, Subang, West Java
Authors: Takarina N. D. 
Published: September 2020

Abstract
Blanakan River is one of the prominent river in West Java. However, the river is subject to the bio-physico-chemical parameter changes caused by surrounding land uses. Correspondingly, this study aims to develop spatial assessment of bio-physico-chemical parameter gradients along Blanakan River. In this study, bio-physico-chemical parameters including biota (fish), dissolved oxygen, pH, salinity, temperature and turbidity have been collected from 9 stations. Those stations were spatially located along river gradients from upstream, middle to downstream areas. Generally, the spatial assessment and data analysis showed a gradient in the values of the turbidity, salinity and biota. Moreover, the result confirms the significant of turbidity gradients in the river (p<0.05, F=13.95301). The mean value of turbidity is higher in the upstream (x=190.93 NTU) and lower in the downstream areas (x=90.66 NTU). Furthermore, the middle followed by downstream areas has high number of fish species from 4 family including Cichlidae, Tetraodontidae Leiognathidae and Mugilidae. The high turbidity in the upstream level is influenced by surrounding land uses, which is dominated by residentials. Meanwhile, land uses in downstream are dominated by fish ponds. To conclude, the land uses gradients along Blanakan River have affected the bio-physico-chemical parameter gradients as well.
Spatiotemporal trend of particulate matter (PM10) concentration on cement industries in Klapanunggal and Citeureup Sub-districts
Authors: Pambudi R A , Naldi A , Luthfi A , Puspitarini D A , Chaerani M M , Permana M W , Shafira S 
Published: September 2020

Abstract
Increasing demand of cement has affected to environment destruction. PM10 pollution that emitted by cement industries in Klapanunggal and Citeureup Sub-districts have affected the health of workers and the people around the industrial site in long-term period. This research discusses the identification on variation of PM10 pollution concentration that emitted by cement industries in Klapanunggal and Citeureup Sub-districts spatiotemporally. The method we used in estimating concentrated PM10 was by applying aerosol optical thickness (AOT) algorithm on Landsat 7 ETM+ and Landsat 8 OLI within 16 years (2002-2018) period of time. The results show that PM10 concentration in Klapanunggal and Citeureup were fluctuated within those 16 years. High concentrated PM10 were tended to agglomerate in cement processing plant, cement-based industrial plant (where cement is used as raw material), and limestone mining which have meaning of causing bad impact to environment sustainability and increase the risk in morbidity and mortality.
The relationship between total suspended matter and sea current for the spread of Chlorophyll-a and fishing area in Jakarta Bay
Authors: Akbar H I , Supriatna S , Patria M P 
Published: September 2020

Abstract
Jakarta bay is a water with high input load due to activities from the surrounding river estuaries comes from Jabodetabek regions. This activity impacts the availability of Total Suspended Matter (TSM) in Jakarta Bay. The problem comes when the concentration of TSM exceeds the carrying capacity of the water thus encouraging plankton to grow and breed rapidly which has caused eutrophication. This research has three objectives: (1) Analyzing the relationship of TSM and Chlorophyll-a Case 2 (CHL2), (2) Analyzing impacts between sea current with CHL2 distribution, and (3) Analyzing correlation CHL2 distribution with fish catch data. Data collection was conducted on January 2018 until December 2018. Monthly TSM and CHL2 data were obtained through GlobColour data, monthly data on sea currents were obtained through Marine Copernicus data. TSM and CHL2 data were processed using the GIS and time series method to determine distribution area. Furthermore, a regression analysis is used to determine the relationship of TSM and CHL2. The result: Relationship of TSM and CHL2 obtained R = 0,8508 so that there is a strong association between TSM and CHL2; the current pattern in the Jakarta bay strongly affected by monsoon wind, the highest distribution occurs in the NWM, evenly distribution occurs in the transition 1, and SEM, the lowest distribution occurs in the transition 2; the demersal and pelagic fish catch period occurs in the end of transition 2 period where high CHL2 concentration and low sea current velocity make it easier for fishermen to catch the fish.