Mountain Scholar :: Browsing by Author "Meroney, Robert N., author"

Browsing by Author "Meroney, Robert N., author"

Now showing 1 - 20 of 94

Open Access
A computer study of transition of wall boundary layers
(Colorado State University. Libraries, 1972) Anyiwo, J. C., author; Meroney, Robert N., author; Fluid Dynamics and Diffusion Laboratory, College of Engineering, Colorado State University, publisher
Open Access
A study of D.A.F. Darrieus vertical axis wind turbine at the C.S.U. Dairy Farm: final report
(Colorado State University. Libraries, 1980-07) Abarikwu, Okezie Ibeji, author; Meroney, Robert N., author; Department of Civil Engineering, Colorado State University, publisher
Open Access
Accelerated dilution of liquefied natural gas plumes with fences and vortex generators: final report, August 1981-May 1982
(Colorado State University. Libraries, 1982-05) Meroney, Robert N., author; Kothari, K. M., author; Fluid Mechanics and Wind Engineering Program, Department of Civil Engineering, Colorado State University, publisher
A wind-tunnel test program was conducted on a 1:250 scale model to determine the effects of fences and vortex generators on the dispersion of LNG plumes. The tests were conducted simulating continuous LNG boil-off rates of 20, 30 and 40 m3/min; 4, 7, 9 and 12 m/sec wind speed for fence data and 4, 7 and 9 m/sec wind speed for vortex generator data; six configurations; and two heights of fences and vortex generators. Plots of ground-level mean concentration contours were constructed. The highest concentrations were observed for the case of no fences and vortex generators. Fences and vortex generators created higher turbulence intensity in the wake and resulted into enhanced mixing thus reducing the ground-level hazards of LNG plumes. In general, the lower wind speed gave the higher ground-level concentration when fence or vortex generator interacted with the LNG plume. However, for the case of no fence or vortex generator the higher concentration persisted for longer downwind distances for 7 m/sec wind speed. As expected, the ground-level concentrations were increased with an increase in LNG boil-off rate but decreased with the increase in the fence/vortex generator height. In general, the solid fences gave the lower ground-level concentration as compared with the vortex generator with identical conditions. The double fences or vortex generators gave the maximum LNG plume dilution. However, the single fence or vortex generator near the source gave approximately the same dilution and hence, it would not justify the additional expenses of having second fence or vortex generator. It was also observed that the maximum LNG plume dilution occurs when the fence or vortex generator is closest possible to the LNG spill area.
Open Access
An effective-viscosity model for turbulent wall boundary layers
(Colorado State University. Libraries, 1971-06) Meroney, Robert N., author; Anyiwo, J. C., author; Fluid Dynamics and Diffusion Laboratory, College of Engineering, Colorado State University, publisher
Existing effective viscosity models which have been very valuable in the mean field closure method for turbulent boundary layer computation have shown certain undesirable limitations for certain realistic but general boundary layer flows. The more general flows usually involve non-negligible considerations of pressure gradients and such wall conditions as roughness, curvature and aspiration or transpiration in varying degrees of importance. The effects of these external and wall influences have, unfortunately, been underplayed by most existing effective viscosity models. The present model of the effective viscosity is developed for a general flow and has shown remarkable agreement with experimentation, without being any more complex than existing models.
Open Access
Analysis of vapor barrier experiments to evaluate their effectiveness as a means to mitigate HF concentrations: final report
(Colorado State University. Libraries, 1988-07) Meroney, Robert N., author; Neff, David E., author; Shin, Seong-Hee, author; Steidle, Thomas C., author; Tan, Thomas Z., author; Wu, Gang, author; Fluid Mechanics and Wind Engineering Program, Department of Civil Engineering, Colorado State University, publisher
Accidental releases of Hydrogen Fluoride (HF) can result in initially dense, highly reactive and corrosive gas clouds. These clouds will typically contain a mixture of gases, aerosols and droplets which can be transported significant distances before lower hazard levels of HF concentration are reached. Containment fences or vapor barriers have been proposed as a means to hold-up or delay cloud expansion, elevate the plume downwind of the barriers, and enhance cloud dilution. Previous related field and laboratory experiments have been analyzed to estimate the effectiveness of barrier devices. The experiments were examined to determine their relevance to Hydrogen Fluoride spill scenarios. Wind tunnel and field data were compared where possible to validate the laboratory experiments. Barrier influence on peak concentrations, cloud arrival time, peak concentration arrival time, and cloud departure time were determined. These data were used to develop entrainment models to incorporate into integral and depth averaged numerical models. The models were then run to examine barrier performance for a typical Hydrogen Fluoride spill for a wide range of vapor barrier heights, spill sizes, meteorological conditions and release configurations. Finally the results of the data analysis and numerical sensitivity study were interpreted and expressed in a form useful to evaluate the efficacy of vapor barrier mitigation devices.
Open Access
Building effects on National Transonic Facility exhaust plume
(Colorado State University. Libraries, 1979) Kothari, K. M., author; Meroney, Robert N., author; Fluid Mechanics and Wind Engineering Program, Department of Civil Engineering, Colorado State University, publisher
Open Access
Buoyancy effects on a turbulent shear flow
(Colorado State University. Libraries, 1974-04) Meroney, Robert N., author; Fluid Dynamics and Diffusion Laboratory, Department of Civil Engineering, Colorado State, publisher
It has long been recognized that the buoyancy force due to density stratification has pronounced effects on the turbulence structure. A number of investigations have utilized stability corrections based on the assumption of the existence of an eddy viscosity or eddy diffusivity. Unfortunately such models are incapable of physically behaving as the measurements in the presence of strong stable or unstable stratifications suggest. Recently Donaldson et al. (1972), Lumley (1972), Daly (1972) and Lee (1974) have proposed closures of the equations of motion in the presence of buoyancy forces which require equations for all Reynold's stresses and heat fluxes. Unfortunately even for a one-dimensional model one must at a minimum then solve simultaneously nine partial differential equations and one algebraic equation. Other theories suggest an even higher total. Utilizing a simple time dependent one-dimensional example as a test case this report discusses a solution which represents the important characteristics of a buoyancy dominated shear flow by solving four partial differential equations in addition to the mean equations of motion. This suggested model solves equations for total turbulent kinetic energy, k, total turbulent temperature fluctuations, kt, eddy dissipation, E, and thermal eddy dissipation, Et. Three separate versions of this model are discussed--an algebraic length scale version, a Prandtl-Kolmogorov eddy viscosity version, and an algebraic stress and heat flux model. The final version (requiring six partial differential equations) manages to replicate results for a much more complicated version (requiring ten partial differential equation). The advantages for two and three dimensional problems are even greater.
Open Access
Comments on "Boundary-layer turbulence measurements with mass addition and combustion"
(Colorado State University. Libraries, 1967) Meroney, Robert N., author; Colorado State University, publisher
Open Access
Cone frustums in a shear layer: technical report
(Colorado State University. Libraries, 1970) Symes, Craig R., author; Meroney, Robert N., author; Fluid Dynamics and Diffusion Laboratory, College of Engineering, Colorado State University, publisher
Open Access
Dispersion of vapor from LNG spills at Energy Terminal Service Corporation: releases during stable atmospheric conditions, simulation in a wind tunnel
(Colorado State University. Libraries, 1981-08) Meroney, Robert N., author; Kothari, K. M., author; Fluid Dynamics and Diffusion Laboratory, Department of Civil Engineering, Colorado State University, publisher
Open Access
Dispersion of vapor from LNG spills: simulation in a meteorological wind tunnel
(Colorado State University. Libraries, 1977-05) Meroney, Robert N., author; Cermak, Jack E., author; Neff, D. E., author; Megahed, M., author; Fluid Dynamics and Diffusion Laboratory, Department of Civil Engineering, College of Engineering, Colorado State University, publisher
Open Access
Dispersion of vapor from LNG spills: simulation in a meteorological wind tunnel of spills at China Lake Naval Weapons Center, California
(Colorado State University. Libraries, 1979-03) Meroney, Robert N., author; Neff, D. E., author; Fluid Dynamics and Diffusion Laboratory, Department of Civil Engineering, Colorado State University, publisher
Open Access
Downwind and lateral wake effects on wind turbine performance
(Colorado State University. Libraries, 1988-10) Neff, David E., author; Meroney, Robert N., author; Fluid Mechanics and Wind Engineering Program, Department of Civil Engineering, Colorado State University, publisher
Open Access
Energy from the wind: annotated bibliography
(Colorado State University. Libraries, 1975-08) Meroney, Robert N., author; Burke, Barbara L., author; Solar Energy Applications Laboratory, College of Engineering, Colorado State University, Foothills Campus, publisher
Open Access
Energy from the wind: annotated bibliography
(Colorado State University. Libraries, 1975-08-1977-04) Meroney, Robert N., author; Burke, Barbara L., author; Solar Energy Applications Laboratory, College of Engineering, Colorado State University, Foothills Campus, publisher
Open Access
Energy from the wind: annotated bibliography
(Colorado State University. Libraries, 1982-04) Burke, Barbara L., author; Meroney, Robert N., author; Solar Energy Applications Laboratory, College of Engineering, Colorado State University, Foothills Campus, publisher
Open Access
Energy from the wind: annotated bibliography
(Colorado State University. Libraries, 1979-12) Burke, Barbara L., author; Meroney, Robert N., author; Solar Energy Applications Laboratory, College of Engineering, Colorado State University, Foothills Campus, publisher
Open Access
Final report on wind tunnel investigation of shapes for balloon shelters
(Colorado State University. Libraries, 1970-07) Meroney, Robert N., author; Symes, Craig R., author; Plate, Erich J., author; College of Engineering, Colorado State University, publisher
In support of a balloon shelter development program at NCAR a series of wind tunnel tests were performed at the Fluid Dynamics and Diffusion Laboratory, Colorado State University. The study concerned the staling criteria for such a simulation; velocity, turbulence, and frequency spectra downwind of four basic shelter shapes; the effect of screen material on shelter efficiency; and the influence of a simulated balloon presence upon the effectiveness of the shelter.
Open Access
Final report: laminar/turbulent transition in transpired boundary layers
(Colorado State University. Libraries, 1974-12) Meroney, Robert N., author; Fluid Dynamics and Diffusion Laboratory, College of Engineering, Colorado State University, publisher
Open Access
Final report: numerical and physical models of urban heat islands
(Colorado State University. Libraries, 1974-12) Meroney, Robert N., author; Fluid Dynamics and Diffusion Laboratory, College of Engineering, Colorado State University, publisher
The response in the atmosphere of stratified shear layers to nonhomogeneous surface features is the subject of this report. Many interesting atmospheric circulations such as the sea breeze, the urban heat island, and flow over a heated island in the ocean (heat mountain) are induced by unbalanced bouyancy forces as a result of differential surface temperature. Such phenomena are very complex since the motion is coupled with several dominant features such as thermal stratification, high roughness elements, nonuniformity of surface roughness and/or surface temperature, nonplanar boundaries, and unsteadiness of boundary conditions. These problems may be successfully examined, however, by a coordinated laboratory-analytical research effort. This report summarizes a numerical and experimental research program which examined such a complicated airflow over nonhomogeneous surface complexities in two- and three-dimensional space.