A5048566939- Wind Energy Research and Development
- Wind and Air Flow Studies
- Fluid Dynamics and Vibration Analysis
- Aerodynamics and Fluid Dynamics Research
- Atmospheric and Environmental Gas Dynamics
- Turbomachinery Performance and Optimization
- Plant Water Relations and Carbon Dynamics
- Fluid Dynamics and Turbulent Flows
- Meteorological Phenomena and Simulations
- Geochemistry and Geologic Mapping
- Solar and Space Plasma Dynamics
- Coastal and Marine Dynamics
- Atmospheric aerosols and clouds
- Aeolian processes and effects
- Coastal wetland ecosystem dynamics
- Building Energy and Comfort Optimization
- Hydrocarbon exploration and reservoir analysis
- Advanced Multi-Objective Optimization Algorithms
- Electric Vehicles and Infrastructure
- Fire effects on ecosystems
- Natural Fiber Reinforced Composites
- Arctic and Russian Policy Studies
- Social Acceptance of Renewable Energy
- Forest ecology and management
- Remote Sensing and LiDAR Applications
Portland State University
2020-2024
National Renewable Energy Laboratory
2023-2024
Toronto and Region Conservation Authority
2024
Newcastle College
2009
Tennessee State University
1997
National Oceanic and Atmospheric Administration
1983
Naval Research Laboratory Information Technology Division
1983
Abstract
Tilting the nacelle of a wind turbine modifies entrainment into plant and impacts total efficiency. Wakes are deflected vertically by tilt in case large angles can disrupt entertainment from undisturbed flow or dissipate on ground. The effect wake behavior is investigated series tunnel experiments for first time. Scale model turbines with hub height diameter 12 cm arranged Cartesian array composed four rows three each. angle was varied third row −15° to 15° chosen 5° increments. Stereo...
Abstract Individual turbine location within a wind plant defines the flow characterisitcs experienced by given turbine. Irregular arrays and inflow misalignment can reduce efficiency producing highly asymmetric wakes with enhanced downstream longevity. Changes in wake dynamics as result of position were quantified tunnel experiment. Scale model turbines rotor diameter 20 cm hub height 24 placed symmetric, asymmetric, rotated configurations. Simultaneous velocity measurements recorded at 11...
Abstract. The eddy viscosity hypothesis is a popular method in wind turbine wake modeling for estimating turbulent Reynolds stresses. We document the downstream evolution of from experimental and large-eddy-simulation data. Wake isolated its surroundings by subtracting inflow profile, driving forces are identified each region. Eddy varies response to changes geometry nacelle misalignment with larger turbines generating stronger velocity gradients shear propose model based on Rayleigh...
Wake losses from neighboring plants may become a major factor in wind plant design and control as additional are constructed areas with high resource availability. Because wakes span large range of physical scales, turbine rotor diameter to tens kilometers, it is unclear whether conventional wake models or strategies effective at the scale. steering axial induction evaluated current work means reducing impact on power levelized cost electricity. FLOw Redirection Induction Steady State...
Abstract A large-scale numerical computation of five wind farms was performed as a part the American WAKE experimeNt (AWAKEN). This high-fidelity used ExaWind/AMR-Wind LES solver to simulate 100 km × domain containing 541 turbines under unstable atmospheric conditions matching previous measurements. The were represented by Joukowski and OpenFAST coupled actuator disk models. Results this qualitative comparison illustrate interactions with ABL structures in flow, well extent downstream wake...
Abstract Characterizing spatial heterogeneity is fundamental in numerous areas, yet defining patterns often depends on qualitative assessments or a priori knowledge. Lacunarity analysis popular occupancy‐based method for identifying relevant length scales spatially heterogeneous systems. From lacunarity, we identify the existence of point which encapsulates given system. This value satisfies conditions lacunarity cutoff function and forms basis index. We evaluate behavior both parameters...
Abstract Biodiversity and habitat loss due to historical continued urbanization anthropogenic development require continuous efforts abate ongoing environmental decline. Restoration enhancement that aim address biodiversity loss, have shown some promise at providing suitable for species in the more urbanized nearshore areas of Lake Ontario. Using 20 years fish community data from Toronto waterfront, this study examined ecosystem responses a spatio‐temporal context across wetland embayment...
Earthbag construction is a sustainable, low-cost, housing option for developing countries. structures are built of individual soil-filled fabric bags (i.e., sand bags) stacked in running bond pattern. Once stacked, earthbags compacted and the soil inside dried in-place to form earthen bricks. Barbed wires placed between each course affect shear transfer within wall. Results an out-of-plane load test on full-scale earthbag wall presented this paper. The was subjected pressure up 3.16 kPa,...
Every year natural disasters result in considerable damage to offshore structures, coastal zones and other vulnerable areas.In Tsunami direct occurs, such as the destruction of structures loss life due wave forces run-up Tsunami.Tsunamis are characterised shallow water waves long period wavelength with extreme height force.They often observed wavelengths excess 150 Km periods over 1.5 hours.Due their large force, Tsunamis propagate high loads.This paper has three main...
Abstract This study investigates the impact of spatial heterogeneity on momentum transport within forest canopies through wind tunnel experiments using 1:200 scale models. The models, crafted from 10 Pores Per Inch reticulated foam, emulate a leaf area index 5.3 and include alternating patches gaps various sizes. Statistical results mean velocity profiles standard deviations show that develop mixing layer. By employing lacunarity analysis to quantify heterogeneity, we establish effectively...
Wind plants generate large-scale wakes, which can affect the performance of neighboring installations. Such wakes are challenging to estimate due inherent complexity in modeling wake interactions between large quantities turbines at various distances. Weighted directed graph networks inform complex models by linking turbine pairs into chains upstream and downstream neighbors for a given wind direction. A novel interpretation network adjacency matrix is proposed where each element represents...
Earth and Space Science Open Archive This preprint has been submitted to is under consideration at Science. ESSOAr a venue for early communication or feedback before peer review. Data may be preliminary.Learn more about preprints preprintOpen AccessYou are viewing the latest version by default [v1]A Lacunarity Based Index Spatial HeterogeneityAuthorsRyanScottiDHawwaKadumiDGiuliaSalmasoMarcCalafRaul BayoanCalSee all authors Ryan ScottiDCorresponding Author• Submitting AuthorPortland State...