Academic literature on the topic 'Wind rose diagram'
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Journal articles on the topic "Wind rose diagram"
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Bharani, R., and A. Sivaprakasam. "Meteorosoft: a excel function for wind data processing and rose diagram." Earth Science Informatics 13, no. 3 (December 18, 2019): 965–71. http://dx.doi.org/10.1007/s12145-019-00435-7.
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Wang, Hao, Tong Guo, Tian-You Tao, and Ai-Qun Li. "Study on Wind Characteristics of Runyang Suspension Bridge Based on Long-Term Monitored Data." International Journal of Structural Stability and Dynamics 16, no. 04 (March 28, 2016): 1640019. http://dx.doi.org/10.1142/s0219455416400198.
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The slender and flexible characteristics make Runyang Suspension Bridge (RSB) sensitive to the wind actions. In order to obtain reliable statistical wind characteristics and monitor the wind environment at the bridge site, two anemometers are included in the structural health monitoring system (SHMS) to collect extensive wind data. In this paper, the recorded real-time wind data are analyzed in detail to acquire the wind rose diagram, mean wind speed and direction, turbulence intensity, turbulence integral scale, and power spectral density (PSD). Three strong wind events including Typhoon Matsa, Typhoon Khanun and Northern wind are comparatively analyzed to show the inhomogeneous wind characteristics. And the measured wind characteristics are compared with the recommended values in current specification of China. The analytical results show that the wind speed and wind direction at RSB site are greatly influenced by the subtropical monsoon climate and typhoon climate. And the traditional known rules concerning turbulence intensity are not proper for strong winds, while the rules can be validated by long-term monitored data. Meanwhile, the recommended values of turbulence integral scale by current specification are suitable for long-term monitored wind, but the adaptability to strong wind is still defective. In addition, the measured along-wind spectra match generally well with the commonly used PSDs of turbulence. However, more researches are still needed to refine current PSDs of turbulence to perfectly satisfy with the measured spectrum. The conclusions can provide references for the wind-resistant analysis of RSB and structures in similar areas.
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Ribeiro, Roberta Everllyn Pereira, Maria Regina da Silva Aragão, and Magaly de Fatima Correia. "Distúrbio Ondulatório de Leste e Linhas de Instabilidade: Impacto na Precipitação no Estado da Paraíba (Wavelike Easterly Disturbance and Squall Lines: Impact on Paraíba State Precipitation)." Revista Brasileira de Geografia Física 6, no. 4 (November 14, 2013): 838. http://dx.doi.org/10.26848/rbgf.v6i4.233081.
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Neste estudo é analisada a relação entre distúrbio ondulatório de leste, formação de linha de instabilidade e volume de chuva no estado da Paraíba. O distúrbio atuou no período de 15 a 17 de julho de 2011. Sua propagação e chegada ao Nordeste do Brasil foram detectadas em diagrama tempo-longitude da componente meridional do vento no nível de 600 hPa. Sua atuação se caracterizou pelo desenvolvimento de convecção profunda linearmente organizada, numa estrutura de linha de instabilidade, na noite dos dias 15 e 16. Perfis termodinâmicos mostram um elevado teor de umidade na baixa troposfera, abaixo de uma inversão térmica de subsidência típica da área dos ventos alísios, antes da formação das primeiras células de convecção profunda. O desenvolvimento e organização da convecção profunda na noite do dia 15 ocasionou o umedecimento de toda a troposfera, uma condição que se manteve até o dia 17. Ventos com intensidade moderada do quadrante sudeste da rosa dos ventos, na baixa e média troposfera, precederam a formação de linha de instabilidade na noite do dia 15. Ventos fracos e com direção variável foram observados nos dias 16 e 17. Houve grandes volumes de chuva no leste da Paraíba. Nas duas maiores cidades do estado os totais pluviométricos foram elevados: 80 mm em João Pessoa no dia 16, e 110 mm em Campina Grande no dia 17.
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In this study the relationship between wavelike easterly disturbance, squall line formation, and precipitation on Paraíba state is analyzed. The disturbance influenced the state from 15 to 17 July 2011. Its propagation and arrival on Northeast Brazil were detected on a time-longitude diagram of the meridional wind component at the 600 hPa level. The disturbance was characterized by the development of linearly organized deep convection, a squall line structure, on the night of the 15th and 16th. Thermodynamic profiles highlighted high moisture content in the lower troposphere, underneath a subsidence inversion typical of the trade winds area, prior to the formation of the first deep convective cells. The deep convection development and organization on the night of the 15th led to the moistening of the entire troposphere, a condition that remained up to the 17th. Winds of moderate intensity on the southeast quadrant of the wind rose, in the low and middle troposphere, preceded the squall line formation on the night of the 15th. Weak winds with variable direction were observed on the 16th and 17th. Large rainfall amounts fell on eastern Paraíba. On the two largest cities of the state rainfall volumes were very high: 83 mm in João Pessoa on the 16th, and 110 mm in Campina Grande on the 17th.
Key words: rainfall, extreme event, thermodynamic structure, Northeast Brazil.
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Kim, Min-Suk, Namin Koo, Seunghun Hyun, and Jeong-Gyu Kim. "Comparison of Ammonia Emission Estimation between Passive Sampler and Chamber System in Paddy Soil after Fertilizer Application." International Journal of Environmental Research and Public Health 17, no. 17 (September 2, 2020): 6387. http://dx.doi.org/10.3390/ijerph17176387.
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Ammonia (NH3) is an important precursor for particulate secondary aerosol formation. This study was conducted to evaluate the applicability of a passive sampler (PAS) for estimating the NH3 emission from chemical fertilizer application (85 kg-N·ha−1) at field scale and to compare the results with a chamber system for the calculation of NH3 emission flux at lab scale. The application of chemical fertilizer increased the ambient NH3 concentration from 7.11 to 16.87 μg·m−3. Also, the ambient NH3 concentration measured by the PAS was found to be highly influenced by not only the chemical fertilizer application but also the weather (temperature and rainfall). Wind rose diagram data can be useful for understanding the distribution of ambient NH3 concentration. In the case of a chamber with few environmental variables, NH3 was emitted very quickly in the early stages and gradually decreased, whereas it was delayed at intervals of about one week at the site. It was found that daily temperature range, atmospheric disturbance by wind and rainfall, changes in soil moisture, and the presence of a flooded water table were the main influencing factors. The PAS data and the chamber system data were observed to have significant differences in spatial-temporal scale. In order to reduce the gap, it seems to be necessary to further develop a chamber system, in order to improve the precision of field analysis and to strengthen the connection between experimental results.
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Farkas, Andrea, Joško Parunov, and Marko Katalinić. "Wave Statistics for the Middle Adriatic Sea." Journal of Maritime & Transportation Science 52, no. 1 (December 2016): 33–47. http://dx.doi.org/10.18048/2016.52.02.
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The paper presents the methodology and results of the sea state statistics development for the middle Adriatic Sea. The study is based on the World Waves Atlas containing data of sea states in the Adriatic Sea calibrated using different satellite missions and numerical wave model simulations during the period of past 23 years. Wave scatter diagram and wave rose at the location in the middle Adriatic Sea are derived from the data. The 3-parametric Weibull distribution and the log-normal distribution for significant wave height and peak spectral periods respectively, are fitted through the data in the World Waves Atlas. Based on available data, the relation between wind speed and wave height is established by regression analysis. Comparison of the relationship between the significant wave height and peak spectral period is performed between the data from the World Waves Atlas and the Tabain’s wave spectrum, frequently used for sea states in the Adriatic Sea. Finally, the most probable extreme sea states for different return periods are calculated and results are compared with another relevant study for the long-term prediction of sea states in the Adriatic Sea.
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Tinoco, Vítor, Benedita Malheiro, and Manuel F. Silva. "Design, Modeling, and Simulation of a Wing Sail Land Yacht." Applied Sciences 11, no. 6 (March 19, 2021): 2760. http://dx.doi.org/10.3390/app11062760.
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Autonomous land yachts can play a major role in the context of environmental monitoring, namely, in open, flat, windy regions, such as iced planes or sandy shorelines. This work addresses the design, modeling, and simulation of a land yacht probe equipped with a rigid free-rotating wing sail and tail flap. The wing was designed with a symmetrical airfoil and dimensions to provide the necessary thrust to displace the vehicle. Specifically, it proposes a novel design and simulation method for free rotating wing sail autonomous land yachts. The simulation relies on the Gazebo simulator together with the Robotic Operating System (ROS) middleware. It uses a modified Gazebo aerodynamics plugin to generate the lift and drag forces and the yawing moment, two newly created plugins, one to act as a wind sensor and the other to set the wing flap angular position, and the 3D model of the land yacht created with Fusion 360. The wing sail aligns automatically to the wind direction and can be set to any given angle of attack, stabilizing after a few seconds. Finally, the obtained polar diagram characterizes the expected sailing performance of the land yacht. The described method can be adopted to evaluate different wing sail configurations, as well as control techniques, for autonomous land yachts.
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Arteaga-López, Ernesto, and César Angeles-Camacho. "Innovative virtual computational domain based on wind rose diagrams for micrositing small wind turbines." Energy 220 (April 2021): 119701. http://dx.doi.org/10.1016/j.energy.2020.119701.
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Chen, Shih-Nan, and Lawrence P. Sanford. "Axial Wind Effects on Stratification and Longitudinal Salt Transport in an Idealized, Partially Mixed Estuary*." Journal of Physical Oceanography 39, no. 8 (August 1, 2009): 1905–20. http://dx.doi.org/10.1175/2009jpo4016.1.
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Abstract A 3D hydrodynamic model [Regional Ocean Model System (ROMS)] is used to investigate how axial wind influences stratification and to explore the associated longitudinal salt transport in partially mixed estuaries. The model is configured to represent a straight estuarine channel connecting to a shelf sea. The results confirm that wind straining of the along-channel salinity gradient exerts an important control on stratification. Two governing parameters are identified: the Wedderburn number (W) defined as the ratio of wind stress to axial baroclinic pressure gradient force, and the ratio of an entrainment depth to water depth (hs/H). Here W controls the effectiveness of wind straining, which promotes increases (decreases) in stratification during down-estuary (up-estuary) wind. The ratio hs/H determines the portion of the water column affected by direct wind mixing. While stratification is always reduced by up-estuary wind, stratification shows an increase-then-decrease transition when down-estuary wind stress increases. Such transition is a result of the competition between wind straining and direct wind mixing. A horizontal Richardson number modified to include wind straining/mixing is shown to reasonably represent the transition, and a regime diagram is proposed to classify the wind’s role on stratification. Mechanisms driving salt flux during axial wind events are also explored. At the onset and end of the wind events, barotropic adjustment drives strong transient salt fluxes. Net salt flux is controlled by the responses of subtidal shear dispersion to wind forcing. Moderate down-estuary winds enhance subtidal shear dispersion, whereas up-estuary winds always reduce it. Supporting observations from upper Chesapeake Bay are presented.
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Xu, Zhongfeng, Zhaolu Hou, Ying Han, and Weidong Guo. "A diagram for evaluating multiple aspects of model performance in simulating vector fields." Geoscientific Model Development 9, no. 12 (December 6, 2016): 4365–80. http://dx.doi.org/10.5194/gmd-9-4365-2016.
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Abstract. Vector quantities, e.g., vector winds, play an extremely important role in climate systems. The energy and water exchanges between different regions are strongly dominated by wind, which in turn shapes the regional climate. Thus, how well climate models can simulate vector fields directly affects model performance in reproducing the nature of a regional climate. This paper devises a new diagram, termed the vector field evaluation (VFE) diagram, which is a generalized Taylor diagram and able to provide a concise evaluation of model performance in simulating vector fields. The diagram can measure how well two vector fields match each other in terms of three statistical variables, i.e., the vector similarity coefficient, root mean square length (RMSL), and root mean square vector difference (RMSVD). Similar to the Taylor diagram, the VFE diagram is especially useful for evaluating climate models. The pattern similarity of two vector fields is measured by a vector similarity coefficient (VSC) that is defined by the arithmetic mean of the inner product of normalized vector pairs. Examples are provided, showing that VSC can identify how close one vector field resembles another. Note that VSC can only describe the pattern similarity, and it does not reflect the systematic difference in the mean vector length between two vector fields. To measure the vector length, RMSL is included in the diagram. The third variable, RMSVD, is used to identify the magnitude of the overall difference between two vector fields. Examples show that the VFE diagram can clearly illustrate the extent to which the overall RMSVD is attributed to the systematic difference in RMSL and how much is due to the poor pattern similarity.
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Krtička, J., J. Kubát, and I. Krtičková. "Stellar wind models of central stars of planetary nebulae." Astronomy & Astrophysics 635 (March 2020): A173. http://dx.doi.org/10.1051/0004-6361/201937150.
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Context. Fast line-driven stellar winds play an important role in the evolution of planetary nebulae, even though they are relatively weak. Aims. We provide global (unified) hot star wind models of central stars of planetary nebulae. The models predict wind structure including the mass-loss rates, terminal velocities, and emergent fluxes from basic stellar parameters. Methods. We applied our wind code for parameters corresponding to evolutionary stages between the asymptotic giant branch and white dwarf phases for a star with a final mass of 0.569 M⊙. We study the influence of metallicity and wind inhomogeneities (clumping) on the wind properties. Results. Line-driven winds appear very early after the star leaves the asymptotic giant branch (at the latest for Teff ≈ 10 kK) and fade away at the white dwarf cooling track (below Teff = 105 kK). Their mass-loss rate mostly scales with the stellar luminosity and, consequently, the mass-loss rate only varies slightly during the transition from the red to the blue part of the Hertzsprung–Russell diagram. There are the following two exceptions to the monotonic behavior: a bistability jump at around 20 kK, where the mass-loss rate decreases by a factor of a few (during evolution) due to a change in iron ionization, and an additional maximum at about Teff = 40−50 kK. On the other hand, the terminal velocity increases from about a few hundreds of km s−1 to a few thousands of km s−1 during the transition as a result of stellar radius decrease. The wind terminal velocity also significantly increases at the bistability jump. Derived wind parameters reasonably agree with observations. The effect of clumping is stronger at the hot side of the bistability jump than at the cool side. Conclusions. Derived fits to wind parameters can be used in evolutionary models and in studies of planetary nebula formation. A predicted bistability jump in mass-loss rates can cause the appearance of an additional shell of planetary nebula.
Dissertations / Theses on the topic "Wind rose diagram"
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Rehman, Shafiqur. "Wind power resource assessment, design of grid - connected wind farm and hybrid power system." Thesis, 2012. http://hdl.handle.net/2263/30831.
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An exponentially growing global population, power demands, pollution levels and, on the other hand, rapid advances in means of communication have made the public aware of the complex energy situation. The Kingdom of Saudi Arabia has vast open land, an abundance of fossil fuel, a small population but has always been among the front-runners where the development and utilisation of clean sources of energy are concerned. Several studies on wind, solar and geothermal sources of energy have been conducted in Saudi Arabia. Solar photovoltaic (pv) has been used for a long time in many applications such as cathodic protection, communication towers and remotely located oil field installations. Recently, a 2MW grid-connected pv power plant has been put online and much larger solar desalination plants are in planning stage. Wind resource assessment, hub height optimisation, grid-connected wind farm and hybrid power system design were conducted in this study using existing methods. Historical daily mean wind speed data measured at 8 to 12metres above ground level at national and international airports in the kingdom over a period of 37 years was used to obtain long-term annual and monthly mean wind speeds, annual mean wind speed trends, frequency distribution, Weibull parameters, wind speed maps, hub height optimisation and energy yield using an efficient modern wind turbine of 2.75MW rated power. A further detailed analysis (such as estimation of wind shear exponent, Weibull parameters at different heights, frequency distribution at different heights, energy yield and plant capacity factor and wind speed variation with height) was conducted using wind speed measurements made at 20, 30 and 40metres above ground level. As a first attempt, an empirical correlation was developed for the estimation of near-optimal hub height (HH = 142.035 * (α) + 40.33) as a function of local wind shear exponent (α) with a correlation coefficient of 97%. This correlation was developed using the energy yield from a wind turbine of 1 000kW rated power and wind speed and local exponent for seven locations in Saudi Arabia. A wind-pv-diesel hybrid power system was designed and specifications were made for a remotely located village, which is being fed 100% by diesel power generating units. The proposed system, if developed, will offset around 35% of the diesel load and therefore will result in decreased air pollution by almost the same amount. The developed wind speed maps, the frequency distributions and estimated local wind shear exponents for seven locations and energy yield will be of great help in defining the further line of action and policy-building towards wind power development and utilisation in the kingdom. The study also recommends conducting a wind measurement campaign using tall towers with wind measurements at more than one height and estimating the local wind shear exponents and developing a wind atlas for the kingdom. The study further states that a grid-connected wind farm of moderate capacity of 40MW should be developed using turbines of varying rated powers. The wind speed data was also analysed using wavelet transform and Fast Fourier Transform (FFT) to understand the fluctuation in wind speed time series for some of the stations. It is also recommended that policy-makers should take firm decision on the development of hybrid power systems for remotely located populations which are not yet connected with the grid. There are two challenges which need research: one is the effect of dust on the moving and structural elements of the wind turbines and the second is the effect of high prevailing temperatures on the performance and efficiency of the same.Thesis (PhD)--University of Pretoria, 2012.
Mechanical and Aeronautical Engineering
PhD
Unrestricted
Conference papers on the topic "Wind rose diagram"
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Kanner, Samuel, and Bingbin Yu. "Evaluating the Coupledness of the Aerodynamics and Hydrodynamics on the Estimation of Fatigue Damage Equivalent Load for a Floating Offshore Wind Platform." In ASME 2018 1st International Offshore Wind Technical Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/iowtc2018-1045.
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In this research, the estimation of the fatigue life of a semi-submersible floating offshore wind platform is considered. In order to accurately estimate the fatigue life of a platform, coupled aerodynamic-hydrodynamic simulations are performed to obtain dynamic stress values. The simulations are performed at a multitude of representative environmental states, or “bins,” which can mimic the conditions the structure may endure at a given site, per ABS Floating Offshore Wind Turbine Installation guidelines. To accurately represent the variety of wind and wave conditions, the number of environmental states can be of the order of 103. Unlike other offshore structures, both the wind and wave conditions must be accounted for, which are generally considered independent parameters, drastically increasing the number of states. The stress timeseries from these simulations can be used to estimate the damage at a particular location on the structure by using commonly accepted methods, such as the rainflow counting algorithm. The damage due to either the winds or the waves can be estimated by using a frequency decomposition of the stress timeseries. In this paper, a similar decoupled approach is used to attempt to recover the damages induced from these coupled simulations. Although it is well-known that a coupled, aero-hydro analysis is necessary in order to accurately simulate the nonlinear rigid-body motions of the platform, it is less clear if the same statement could be made about the fatigue properties of the platform. In one approach, the fatigue damage equivalent load is calculated independently from both scatter diagrams of the waves and a rose diagram of the wind. De-coupled simulations are performed to estimate the response at an all-encompassing range of environmental conditions. A database of responses based on these environmental conditions is constructed. The likelihood of occurrence at a case-study site is used to compare the damage equivalent from the coupled simulations. The OC5 platform in the Borssele wind farm zone is used as a case-study and the damage equivalent load from the de-coupled methods are compared to those from the coupled analysis in order to assess these methodologies.
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Zhao, Fengnian, Penghui Ge, Hanyang Zhuang, and David L. S. Hung. "Analysis of Crank Angle-Resolved Vortex Characteristics Under High Swirl Condition in a Spark-Ignition Direct-Injection Engine." In ASME 2017 Internal Combustion Engine Division Fall Technical Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icef2017-3574.
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In-cylinder air flow structure makes significant impacts on fuel spray dispersion, fuel mixture formation, and flame propagation in spark ignition direct injection (SIDI) engines. While flow vortices can be observed during the early stage of intake stroke, it is very difficult to clearly identify their transient characteristics because these vortices are of multiple length scales with very different swirl motion strength. In this study, a high-speed time-resolved 2D particle image velocimetry (PIV) is applied to record the flow structure of in-cylinder flow field along a swirl plane at 30 mm below the injector tip. First, a discretized method using flow field velocity vectors is presented to identify the location, strength, and rotating direction of vortices at different crank angles. The transients of vortex formation and dissipation processes are revealed by tracing the location and motion of the vortex center during the intake and compression strokes. In addition, an analysis method known as the wind-rose diagram, which is implemented for meteorological application, has been adopted to show the velocity direction distributions of 100 consecutive cycles. Results show that there exists more than one vortex center during early intake stroke and their fluctuations between each cycle can be clearly visualized. In summary, this approach provides an effective way to identify the vortex structure and to track the motion of vortex center for both large-scale and small-scale vortices.
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Matsumoto, M., T. Yagi, J. H. Lee, K. Hori, and Y. Kawashima. "Karman Vortex Effect on the Aerodynamic Forces to Rectangular Cylinders." In ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/pvp2006-icpvt-11-93783.
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Standing on the back-ground associated with the complicated bluff body aerodynamics affected by Karman vortex, the fundamental wind tunnel tests have been carried out to clarify the role of Karman vortex on the aerostatic forces and the aerodynamic forces of 2D rectangular cylinders with various side ratios in the range from B/D=0.3 to B/D=15. For mitigation of Karman vortex, a splitter plate with suitable size was installed in a wake center. As far as stationary drag force, the sharp peak in CD-B/D diagrams, completely disappear by a splitter plate installation. On the other hand, the value of dCL/dα is significantly sensitive to the Karman vortex, in particular, even its sign changes in the range from B/D=0.6 to B/D=0.7 and B/D=3.0 to B/D=4.0, which means the significant role of the Karman vortex on the galloping instability, from the point of quasi-steady theory. Furthermore, the flutter derivatives are also drastically affected by Karman vortex in the rather wide reduced velocity far from the Karman vortex resonant reduced velocity. In summary, it would be emphasized that the substantial bluff body flow might be characterized by the side ratio of cylinders, and these fundamental flows should be significantly or slightly affected by Karman vortex depending on their side ratios of cylinders.
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Thomassen, Paul E., and Bernt J. Leira. "Assessment of Fatigue Damage of Floating Fish Cages Due to Wave Induced Response." In ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/omae2009-79674.
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Floating fish cages provide the main production utilities for salmon farming. However, despite their pivotal role in production safety as well as in protection of the environment, there is still much room for improvement in relation to verified structural design procedures and computerized tools for structural analysis. To a large extent they can be regarded as not being in accordance with the state-of-the-art of structural analysis and design for more traditional types of marine structures. In this paper a study of fatigue design for floating fish farms is presented. The study is based on a structure which is being applied by the Norwegian fish farming industry today. The floater is made of steel cylinders which are configured as a square. The formulation for the wave loading is based on a combination of potential theory and horizontal drag forces on the floater. Horizontal and vertical drag forces on the netpen are also accounted for. A fatigue design procedure for floating fish farms in steel is suggested. The procedure is based on a time domain analysis of the structure in irregular waves. For each seastate half an hour (real time) analysis is performed and the stress history for an assumed critical location is computed. Based on the stress histories, the fatigue damage is estimated by application of rain flow counting and a given SN curve. The scatter diagram for the seastates at a given location is generated from the associated wind speed distribution.
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Serpoushan, Nima, Mostafa Zeinoddini, and Maziar Golestani. "An Ensemble Kalman Filter Data Assimilation Scheme for Modeling the Wave Climate in Persian Gulf." In ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/omae2013-10399.
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In recent years, application and evaluation of the efficiency of different data assimilation methods has been a subject of interest in both wave hindcasting and forecasting systems. The main goal of the current study is to assess the efficiency of an ensemble Kalman filter (EnKF) data assimilation scheme in improving the wave simulation results in Persian Gulf. The so called region plays an important role in the oil and gas industry due to its Geographical and Morphological location and housing a large number of offshore platforms. A third generation wave model, SWAN, was employed in order to simulate the wave fields in the region. The three hours updated ECMWF wind data were used as the main driving force. The OpenDA toolbox, especially developed for efficient data assimilation purposes, was employed to smooth the chaotic nature of the non-linear wave simulation scheme. The OpenDA utilizes a number of methods that are based on Kalman filter algorithm but do not require the amount of computation efforts that are incurred by the classical filter algorithm. The EnKF is a variant of Kalman filter, where probability density function of a model state is represented by an ensemble of the model state. Two sets of records for significant wave heights and peak wave periods were used in the analysis process with EnKF to estimate the error covariance matrix. At analysis time, the forecast error covariance was computed by using the model forecasts ensembles. In overall and for the wave climate modeling, the initial conditions of the numerical model were updated using the improved system state, up to the current computing time level. This is achieved by incorporating the previous measurements into the Kalman filter algorithm. The model was then run into the future, driven by the new improved state conditions. The statistical results and diagrams showed that applying EnKF scheme leads to a noticeable improvement in significant wave heights. However, the accuracy of this technique was subjected to the location and number of observation stations and also ensemble size. With larger ensembles, results of error covariance estimation are more accurate but there is a limitation due to execution time of process and efficiency of the computations.