bluuebunny/crossref_metadata_2025_split huggingface dataset:
On the dynamic response of a pitch/torque controlled wind turbine in a pulsating dynamic wake
Authors: Cacciola S , Bertozzi A , Sartori L , Croce A 
Published: September 2020

Abstract
The interaction between wakes and rotors is typically detrimental in terms of the overall power production of a wind farm. The recently studied wind farm controllers represent a promising way to increase the energy harvested through the mitigation of the effects induced by wake impingement. Recently, a novel methodology, based on a dynamic variation of induction, has been proposed as an alternative to steady induction and wake redirection controls. According to this new technology, a periodic collective motion of blade pitch generates a dynamic induction, associated with a stronger flow mixing and therefore a faster wake recovery. Although this technique proved to be effective in terms of power increase, both in numerical simulations and in wind tunnel experiments, much is to be done in order to demonstrate its feasibility. In particular, the impact of dynamic induction control in terms of downstream turbine dynamics has not been yet analyzed in detail. This paper presents a CFD-based analysis aimed at describing the response of a downstream rotor inside the wake of an upstream machine performing dynamic induction control. Specifically, the periodic induction entails a pulsating flow downstream which interacts significantly with the aero-servo-elastic dynamics of the downstream turbines. For low wind speeds, such an oscillating flow may trigger a shut-down/start-up sequence any time the velocity results lower than the cut-in speed.
Tilted wind turbines in farm configuration for improved global efficiency
Authors: Trigaux Francois , Moens Maud , Chatelain Philippe , Winckelmans Grègoire 
Published: September 2020

AbstractThe advance in wind turbine technology has led to a tendency to gather the turbines into wind farms to benefit from economies of scale. However, the farm configuration often leads to a drastic power loss due to the interactions between the turbines. To mitigate this issue, the turbines are typically misaligned with the dominant wind direction to deviate their wake. In this paper, a tilt-induced wake deviation strategy is studied in a farm configuration using large eddy simulation of an atmospheric boundary layer and an actuator line model for the blade. The results show an effective wake deviation and a significant increase of the total power production of the farm. The evolution of the time-averaged and unsteady loads is also assessed in the wind farm, and the resulting damage equivalent load is shown to be reasonably modified when the turbines are tilted. The tilted configuration is also compared with a wind farm with yawed turbines and is found to lead to a larger power output for a reduced damage equivalent load.
Numerical study on the Wave Boundary Layer, its interaction with turbulence and consequences on the wind energy resource in the offshore environment
Authors: Paskin Liad , Perignon Yves , Conan Boris , Aubrun Sandrine 
Published: September 2020

Abstract
The wind energy farming in the offshore environment is characterized by ever-increasing structures and costs, for which reducing structural damage and maximizing production become an imperative. Such challenge is faced by site planning, intelligent design and active control systems that ultimately require a fine Atmospheric Boundary Layer (ABL) description. Contributing to refine the wind flow description in the offshore environment for engineering purposes, this work considers: (i) The interaction between turbulent and Wave Induced fluctuations, pronounced in the lower portion of the Marine ABL (MABL): Region so-called Wave Boundary Layer (WBL); (ii) The impact of the WBL in the flow above it.
Focusing in the MABL sustained by non-equilibrium old-seas in neutral atmospheric conditions, the free-surface position and velocities are here prescribed into a Large Eddy Simulation (LES) according to a fifth order Stokes solution. The swell disturbances on the WBL are explored through mean profiles and spectral analyses. An original definition of the Wave Induced flow is presented, considering correlated turbulent and Wave Induced motions thus accessing the coupled dynamics between those fields and allowing the evaluation of the WBL height. Employing the proposed decomposition, the turbulent flow characteristics are recovered as expected in a flat bottom ABL, though some of its scales change considerably, forced by the WBL existent below.
Inverse Directional Simulation: an environmental contour method providing an exact return period
Authors: Dimitrov Nikolay 
Published: September 2020

Abstract
This study presents an improved approach for drawing environmental contours, derived from the inverse First Order Reliability Method (iFORM). It is shown that the approach used in the iFORM method is not accurate as it only takes into account a fraction of the probability space behind the contour line-which means that the iFORM method provides inherently non-conservative environmental contours. iDS, an alternative solution based on the chi-square distribution is suggested, and its adequacy is demonstrated with a Monte Carlo simulation. An expression is derived for computing sector-constrained environmental contours where the exceedance probability is contained within specific range of interest for one or more variables. The newly suggested environmental contour methods are applied on measured wind and turbulence time series and compared with the iFORM method.
A new method to characterize the curled wake shape under yaw misalignment
Authors: Sengers B.A.M. , Steinfeld G. , Heinemann D. , Kühn M. 
Published: September 2020

Abstract
Wake Redirection Control due to intentional yaw misalignment is a promising method to enhance power yield at wind farm level. A turbine misaligned with the inflow wind produces a curled wake shape, which is currently not accounted for in wake tracking algorithms. This study proposes a new 2D wake description specifically designed to account for the non-elliptic shape of the redirected wake. The performance of this new method is evaluated by employing a Large Eddy Simulation model at different atmospheric stratifications. A comparison with traditionally used approaches indicates an improvement in describing wake shape and center position, and consequently a significantly higher accuracy in the power estimation of a virtual downstream turbine. A brief outlook suggests that this wake tracking algorithm is suited to study the effect of the most influential atmospheric and operational parameters on wake propagation under yaw misalignment and the development of a physically based empirical wake parameterization.
Quantification of rotor thrust and momentum deficit evolution in the wake using Nalu-Wind simulations
Authors: Herges Thomas , Kelley Christopher , Hsieh Alan , Brown Kenneth , Maniaci David , Naughton Jonathan 
Published: September 2020

Abstract
Nalu-Wind simulations of the neutral inflow Scaled Wind Farm Technology (SWiFT) benchmark were used to analyze which quantities of interest within the wind turbine wake and surrounding control volume are important in performing a momentum deficit analysis of the wind turbine thrust force. The necessary quantities of interest to conduct a full Reynolds-Averaged Navier-Stokes (RANS) formulation analysis were extracted along the control volume surfaces within the Nalu simulation domain over a 10 minute period. The thrust force calculated within the wake from two to eight diameters downstream using the control volume surfaces and the full RANS approach matched the thrust force that the wind turbine applied to the flowfield. A simplified one-dimension momentum analysis was included to determine if the inflow and wake velocities typically acquired during field campaigns would be sufficient to perform a momentum deficit analysis within a wind turbine wake. The one-dimensional analysis resulted in a 70% difference relative to the coefficient of thrust (Ct
) determined by the full RANS method at 2D downstream and a 40% difference from 5D to 8D, where D is the diameter of the turbine. This suggests that the quantities typically captured during field campaigns are insufficient to perform an accurate momentum deficit analysis unless streamwise pressure distribution is acquired, which reduced the relative difference to less than 10% for this particular atmospheric inflow.
Favorable wind states in wind energy production at La Rumorosa I wind farm
Authors: Magali Arellano-Vazquez , Marlene Zamora-Machado , Robles M. , Jaramillo O. A. 
Published: September 2020

Abstract
This work introduces a statistical method that identifies wind states present in the wind farm La Rumorosa by analyzing wind speed and nacelle position (wind direction). These states contribute to the generation of wind power in microscale, mesoscale, and macroscale phenomena. The data were obtained from five wind turbines at the onshore and anemometric tower in La Rumorosa located on the border with the state of California, USA. The contribution of wind states and their impact on the annual power production in the wind farm was observed using this method. It is concluded that the method reliably identifies wind patterns with low computational effort.
Spatial adaptation of Rusunawa Muara Baru residents, North Jakarta in livelihood activities
Authors: Nindyatama N , Setiadi H , Rizqihandari N 
Published: September 2020

Abstract
Illegal settlements are a form of increasing demand for settlements in the capital city of Jakarta triggered d by urbanization. One of them is in Waduk Pluit, North Jakarta. This situation forced government to hold the normalization and relocation towards Rusunawa Muara Baru in 2015 to restore the function of the reservoir and restrain the urban settlement infrastructure. This research is a qualitative study using a humanistic geographical approach as its foundation. This research aims to determine changes in their residential characteristics and their basic needs as well as to identify the new form of adaptations in their livelihood activities after relocation. The results showed that residents who have relocated value the positive physical environment in their new housing but also increase in their basic needs, mainly due to rental fees. This condition causes residents to adapt by having additional jobs. Some residents who didn’t have additional jobs, work in the services sector. Otherwise, some residents maintain it with same or different types of business. The business space location determines the type of business, this causes some of them to change the type of business based on market conditions around their business space. They use public space as additional jobs’ location.
Characteristic of popular culinary place in Kelurahan Tamalanrea Indah based on Universitas Hassanudin student’s Mental Maps
Authors: Maharani N , Setiadi H , Rizqihandari N 
Published: September 2020

Abstract
Mental maps concept emerged in discussions among experts since the 1960s where the concept was combined using participatory in exploring the visualization of the city and spatial preferences. This study discusses the characteristics of popular eating places based on an evaluation of spatial products in the discussion of space. For comparison purposes, it takes participants who need to fill in the required form about the characteristics of the eating place based on their favorite places to eat and analyze the printed map and mental map. Universitas Hassanudin students are selected as research participants. They chose to map three of their favorite eating places in Tamalanrea Indah Village as a basis to determine their popular eating places while revealing their mental maps. In total, there are 10 participants which produced 18 names of favorite eating places. Ten respondents who were willing to fill in the map, and evaluate the mental maps, is compared. From the data obtained, the three most popular places to eat in Tamalanrea Indah Village that were successfully validated were Bokatana, Waroeng Dian and Warung Alhamdulillah. In general, the mental map produced is based on the variable length of stay and length of study at the Universitas Hassanudin which affects the accuracy of the mental maps, while for popular eating places students are selected based on the distance from the faculty to compare the distance of the residence.
Contribution of Tanjung Lesung Beach tourism destinations to communities in Panimbang District, Pandeglang Regency, Banten
Authors: Amanda R , Tambunan R P , Waryono T 
Published: September 2020

Abstract
Tanjung Lesung Beach is a government priority to be developed because it entered the Special Economic Zone which was inaugurated on February 2015. This coastal area was chosen as a special economic zone because it has criteria as SEZ in accordance with Law Number 39 of 2009 concerning Special Economic Zones. However, currently, Tanjung Lesung Beach has experienced a decline in tourists due to the Sunda Strait tsunami on December 22, 2018. This study aims to analyze the right strategy to develop the Tanjung Lesung Beach tourist attraction to attract tourists and identify its contribution to the surrounding community. Based on the results of the tsunami research that befell Pandeglang District, it greatly affected the interest of tourists to visit and also resulted in some tourist facilities being paralyzed. After the classification of the feasibility of developing a tourist attraction with the ADO-ODTWA method can be concluded after the tsunami 73.1% Tanjung Lesung Beach is still feasible to develop and has high potential. In terms of the social and economic aspects of this tourist attraction, it contributes to society such as many surrounding communities who work as hotel employees in the region, build infrastructure, and build new businesses. Various new businesses began to emerge such as managing homestays, inn, villa tenants, boat rentals, culinary tours, crafts, arts.
Dayak Iban Tribe shifting cultivation system pattern using unmaned aerial vehicle and Landsat Data in Mensiau Village
Authors: Pribadi U A , Supriatna  , Rokhmatulloh  , Afdhalia F 
Published: September 2020

Abstract
Shifting cultivation by Dayak Iban Tribe in Mensiau Village have several stages, namely burn the land, rice cultivating for two or three planting seasons, and abandoned for reforestation. Vegetation growth through several stages on one cycle, ideally started from burn scar, rice field, bushes, young secondary regrowth, old secondary regrowth, then become secondary forest, so that cycle needs 20 years. The aim of this study is to identify the spatial characteristic of shifting cultivation from UAV data, calculating the change on cycle from Landsat NDVI temporal analysis, also calculating the distance from home and access to the field using Euclidean Distance Analysis. The result shows most of shifting cultivation happen on hilly area with 15-25% slope and Ultisol soil type. NDVI analysis for some field shown increasing of cycle time from 3 to 5 year, and distance analysis reveal that shifting cultivation mostly take place near the roads.
Household shopping behavior in Depok City
Authors: Hanif A K , Nurlambang T , Sumadio W 
Published: September 2020

Abstract
Distribution of malls in Depok City is not even throughout the city. Most malls are located in the city center. Distance between malls is relatively close. While most malls are in the center of the city, quite a lot of residential areas are located far from them. The aim of this study is to determine the patterns of shopping behavior of family household needs in Depok City. Respondents are obtained by distributing questionnaires to households throughout the city using systematic random sampling method. The result shows that households choose a regional mall that is more complete than other malls in choosing shopping site to buy their needs, even though the distance is farther. This happens especially if the shopping activities are carried out with other activities, such as entertainment. Variables that influence shopping behavior are length of stay and type of transportation mode. The variables that are taken into account as the main consideration are completeness of facilities and types of goods that are sold. The conclusion of this study shows that close distance to malls does not affect household behavior in shopping. However, shopping behavior is influenced by the household’s knowledge of the area and accessibility of transportation modes.
Local wisdom of traders and characteristics of traditional market in Pariaman City and its surrounding
Authors: Nuryanti A W , Setiadi H , Rizqihandari N 
Published: September 2020

Abstract
Minangkabau has a strong reputation as an entrepreneur society, mainly based on their involvement in trade (galeh). This society created some famous trading cities along with the east coast of Sumatera that has been thriving as homes of diverse culture, and Pariaman City as one of them. As a trading city, there are various marketplaces across Pariaman and its surrounding that influenced from this mixed culture. By the qualitative method and descriptive approach, the purpose of this study is to examine the distribution of marketplaces and how the specific local wisdom creates their level of traditionalism. Field observations and some in-depth interviews were held to identify how the kinship system may affect their trade networking at each marketplace. The type of Minangkabau markets is determined by the variety of its commodities, which is defined by their stall owner. The owner who inherits their stalls sells local and traditional commodities because they have strong relationships and also the obligation with their kinship. The owner who bought independently can sell various products freely. The “Balai days” event brings together the Minangkabau sellers (rantau and darek) is the principal identity of the traditional Minangkabau market across Pariaman area. The more traditional market, the less-strategic area it places, and the less traditional is the reverse.
The pattern of visiting restaurants in Glagah Beach, Kulon Progo Regency, Yogyakarta
Authors: Hudayanti C , Setiadi H , Rizqihandari N 
Published: September 2020

Abstract
Nowadays, culinary tourism is not just a transient phenomenon but also has become an attraction and the main destination for travelling. Therefore, restaurants are believed to be able to become the main element that functions as an adhesive in a tourist attraction. In this study, the restaurant is the focus of the research, namely Seafood restaurants located in Glagah Beach Tourism Object, Kulon Progo Regency, Yogyakarta. This study aims to analyze the attractiveness of restaurants and patterns of visiting seafood restaurants in Glagah Beach Tourism Objects. The variables used in this study include the uniqueness of restaurants, consumer characteristics, and tourist characteristics. The results showed that the attraction of seafood restaurants was more significant than the other of Glagah Beach attraction. The pattern of visiting restaurants formed at seafood restaurants is the result of weekday and weekend visits from local visitors, sub-regional visitors, and regional visitors.
Livelihoods sustainability pattern in Sangrawayang Village, Simpenan District, Sukabumi Regency
Authors: Kamiludin F , Setiadi H , Sumadio W 
Published: September 2020

Abstract
Season changes influenced the fishers’ job. Their economic life is not stable. Therefore, fishers in Indonesia, especially in Java Island, also cultivate the land. Whenever their area has good access, they have more than two types of job. Sanggrawayang village in Sukabumi District is a fishing village whose fishers earn its income from farming as well. Since 2016, dwellers also have begun working in the service sector, namely services related to tourism activities. This study tries to find out the fishing activities sustainability by using Sustainability Livelihood Approach. By conducting semi-structured interviews with 20 fishers, we can classify the fishermen into three groups, namely fisher laborers, individual fishers, and fishers that own business. Most of the residents are labor fishermen. The result showed that with limited financial and working capital, laborers had more types of work. Their strategy to maintain fishers’ activities is by developing themselves in the services field, both related to fishermen and agricultural activities, as well as in the tourism sector. While fishery business owner who have high financial capital, significant working capital, and extensive networks, are more focused on working in the fishermen sector. Expansion of work in fishermen is carried out by business owner by renting boats and expanding fishing activities by acting as a middle person and distributors as well. The government program is needed to maintain the fishermen smallholder livelihood. This program is designed to be in line with the culture of fishers in Sukabumi.
The economic value of peri-urban wetland ecosystem services in Phnom Penh, Cambodia
Authors: Ro C , Sovann C , Bun D , Yim C , Bun T , Yim S , Irvine K N 
Published: September 2020

Abstract
Boeng Cheung Aek is a large peri-urban wetland in south Phnom Penh, Cambodia that provides multiple ecosystem services, but increasing urban development has initiated an ambitious program of in-filling. In an effort to demonstrate the importance of the wetland to city planners, we have undertaken this research to document and value the ecosystem services provided by Boeng Cheung Aek. Using a mixed method approach of geospatial technology, household surveys, market value, and avoided cost assessments, we determined the economic value for wastewater treatment, food, and water provisioning in the wetlands is $30.12 millionUSD per year, but with a range of $15.71-$48.96 million USD per year.
Tea smallholder sustainability, a case study in Cisitu Village, West Java, Indonesia
Authors: Imam M I K , Setiadi H , Sumadio W 
Published: September 2020

Abstract
These days tea smallholders are facing droughts due to climate change. The government has several programs that aim at helping tea smallholders to solve their problems. The objective of this paper is to examine the sustainable livelihood approach of the tea smallholders by integrating the government programs and the resources that they have. Data is collected through semi-structured interviews with 15 tea smallholders in Cisitu Village in West Java. This village is about 25 kilometres from Sukabumi City, the capital city of the district of Sukabumi. Our analysis shows that smallholders with small resources tend to become poorer. Besides the limitation of their resources, the government programs do not seem to facilitate them. On the other hand, smallholders with strong and diverse assets gain benefits from the government programs. However, social capital is the main resource that could support poor smallholders to relieve their financial pressure. By joining the farmer group institutions, farmers will be supported to fulfil their farming needs. Besides the group institutions, almost all smallholders support their financial needs by running grocery stalls, planting cash crops, or having other another job in other areas