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RISAnalysis of Errors in the Horizontal Divergence Derived from High Temporal Resolution of the Wind
Publisher: American Meteorological Society
Abstract: The vorticity method is applied to determine horizontal divergence using the dynamical balance of terms in the vorticity equation. The viability of the method is analyzed in terms of dynamical approximations, sensitivity ...
QNH: Mesoscale Bounded Derivative Initialization and Winter Storm Test over Complex Terrain
Publisher: American Meteorological Society
Abstract: Mesoscale bounded derivative initialization (BDI) is utilized to derive dynamical constraints, from which elliptic equations are formulated to derive smooth initial fields over complex terrain for mesoscale models. The ...
Testing State-Space Controls for the Controls Advanced Research Turbine
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Control can improve wind turbine performance by enhancing energy capture and reducing dynamic loads. At the National Renewable Energy Laboratory, we are implementing and testing state-space controls ...
Modeling Forced Convection in Finned Metal Foam Heat Sinks
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A numerical study has been undertaken to explore the details of forced convection heat transfer in finned aluminum foam heat sinks. Calculations are made using a finite-volume computational fluid ...
The Use of Quasi-Nonhydrostatic Models for Mesoscale Weather Prediction
Publisher: American Meteorological Society
Abstract: In recent years, there has been extensive study of the mathematical basis of weather prediction leading to a new system of continuous equations that are well posed, and a set of conditions that make discrete atmospheric ...
QNH: Design and Test of a Quasi-Nonhydrostatic Model for Mesoscale Weather Prediction
Publisher: American Meteorological Society
Abstract: A new mesoscale weather prediction model, called QNH, is described. It is characterized by a parameter that multiplies the hydrostatic terms in the vertical equation of motion. Models of this type are referred to generically ...
Automated Surface Defect Detection Using High-Density Data
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: State-of-the-art measurement technologies, such as 3D laser scanners, provide new opportunities for knowledge discovery and development of quality control (QC) strategies for complex manufacturing systems. These technologies ...
Methods for Increasing Region 2 Power Capture on a Variable-Speed Wind Turbine
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The standard region 2 control scheme for a variable-speed wind turbine, τc=Kω2, has several shortcomings that can result in significant power loss. The first of these is that there is no ...
Estimation of Kinetic Energy Dissipation from Breaking Waves in the Wave Crest Region
Publisher: American Meteorological Society
Abstract: ave-induced turbulence due to breaking in the absence of surface shear stresses is investigated experimentally. A high-fidelity particle image velocimetry (PIV) technique is used to measure the turbulence near the water ...