42,291 research outputs found
Z. Smith Reynolds Foundation
No full textMen seated at table signing Z. Smith Reynolds Foundation document. From left: Secretary of Z. Smith Reynolds Foundation Thomas Lambeth; unidentified man; Wake Forest University President James Ralph Scales; unidentified man.ca. 198
Large eddy simulations of a circular cylinder at Reynolds numbers surrounding the drag crisis
No full textLarge eddy simulations of the flow around a circular cylinder at high Reynolds numbers are reported. Five Reynolds numbers were chosen, such that the drag crisis was captured. A total of 18 cases were computed to investigate the effect of gridding strategy, domain width, turbulence modelling and numerical schemes on the results. It was found that unstructured grids provide better resolution of key flow features, when a ‘reasonable’ grid size is to be maintained.When using coarse grids for large eddy simuation, the effect of the turbulence models and numerical schemes becomes more pronounced. The dynamic mixed Smagorinsky model was found to be superior to the Smagorinsky model, since the model coefficient is allowed to dynamically adjust based on the local flow and grid size. A blended upwind-central convection scheme was also found to provide the best accuracy, since a fully central scheme exhibits artificial wiggles which pollute the entire solution.Mean drag, fluctuating lift and Strouhal number are compared to experiments and empirical estimates for Reynolds numbers ranging from 6.31 × 104 ? 5.06 × 105. In terms of the drag coefficient, the drag crisis is well captured by the present simulations, although the other integral quantities (rms lift and Strouhal number) less so. For the lowest Reynolds number, the drag is seen to be most sensitive to the domain width, while at the higher Reynolds numbers the grid resolution plays a more important role
Weems-Reynolds Family papers
No full textThis collection contains the papers of the Weems Family, one of the oldest families in Maryland, and of the Reynolds and Petherbridge families, which were related to the Weems by marriage. The collection consist of correspondence, maps and monographs, and addresses such subjects as state and local politics; the Republican National Convention in Baltimore (1893); Weems family genealogy; horticulture; religion; and election fraud in Maryland
Thomas Rotch accounts payable, Kendal 1811-1818
No full textWilliam Reynolds, Clerk of Court presents his bill for record keeping to Thomas Rotch, $9.88. Context unclear. 7.75" x 7.2
Code and data accompanying "Cell geometry across the ring structure of Sitka Spruce"
No full textMicro computed x-ray tomography scans of Sitka spruce wood at two scales: one overview scan of three 7mm by 7mm by 70mm specimens with a voxel size of 52.7 micron, showing the ring structure of the wood, and seven scans of smaller parts of those specimens with voxel sizes ranging from 1.05 micron to 2.49 micron, showing the geometry of the cells. The location of each high resolution scan is identified within the overview scan to allow comparison and correlation of the data at these two scales.
# Funding #
The depositor would like to acknowledge the following support:
* Leverhulme Trust Programme Grant: ’Natural Material Innovation’;
* EPSRC Grant No. EP/M028267/1: The Advanced Imaging of Materials (AIM) facility.# File listing #
(1) "Readme.txt" - documentation
(2) "LargeScale_Locations.mat" - 'LargeScale' array is the overview scan as a 3D uint8 array at 52.7 micron resolution, and 'Specimen...' are 3D logical arrays indicating the location of each sub-specimen.
(3) "Specimen X Number X.zip" - Each of these zip files contains:
* 'Header.txt' - Details of the scan, including resolution in microns
* 'scandata.mat' - A 3D uint8 array of the subspecimen scan
* 'segment.m' - A script to binarize, smooth and segment the scan data, giving a 3D array with each cell identified by an index number (may be 'segmentearly.m' and 'segmentlate.m' for scans with a hard transition between earlywood and latewood)
Special to the Telegram by Thomas Hedley Reynolds, president of the University o
No full textSpecial to the Telegram by Thomas Hedley Reynolds, president of the University of New England, on plans announced recently by the University of Southern Maine to develop a number of new programs, some of which may compete with programs offered at UNE
William Thomas Reynolds
No full textThis negative shows a photograph of William Thomas Reynolds, the son of Elhanan Burton Reynolds and Margaret Craig A. Reynolds. William Thomas Reynolds served in Company H of the 3rd Regiment Delaware Volunteers. Reynolds died while serving with the Army
William Thomas Reynolds
No full textThis negative shows a photograph of William Thomas Reynolds, the son of Elhanan Burton Reynolds and Margaret Craig A. Reynolds. William Thomas Reynolds served in Company H of the 3rd Regiment Delaware Volunteers. Reynolds died while serving with the Army
John Thomas Reynolds
No full textStudio portrait of John Thomas Reynolds.
John Thomas Reynolds was born in 1858 in Brunswick County, NC. He worked for the Navassa Guano Company, which manufactured fertilizers and chemicals, as a master carpenter and river pilot. He had five children with his second wife, Jennie May Baldwin. Reynolds died in 1913 and is buried in Bellevue Cemetery
Effects of Damping and Reynolds Number on Vortex-Induced Vibrations
No full textVortex-induced vibrations have been studied experimentally with emphasis on damping and Reynolds number effects. Our system was an elastically-mounted rigid circular cylinder, free to oscillate only transverse to the flow direction, with very low inherent damping. We were able to prescribe the mass, damping, and elasticity of the system over a wide range of values, with the damping controlled by a custom-made variable magnetic eddy-current damping system.
Special emphasis is put on a nontraditional parameter formulation. The advantages of this formulation are explained, and an important new parameter, effective stiffness, is introduced. Using this new formulation, the amplitude and frequency responses are only a function of damping, Reynolds number, and effective stiffness. We show the effects that damping and Reynolds number each have on the amplitude and frequency response profiles and make the interesting observation that changes in damping or Reynolds number have similar effects.
The maximum amplitudes of our systems are studied in detail. We theoretically show that they should be functions of both damping and Reynolds number. This allows us to create constant-Reynolds-number curves of maximum amplitude over a large range of damping values, which we call a "generalized" Griffin plot. We also define maximum amplitudes in the case of zero damping as limiting amplitudes, and show that they are only a function of Reynolds number. We experimentally determine our limiting amplitude dependence on Reynolds number over the range 200 < Reynolds number < 5050.
Discontinuities in the amplitude response profile are also investigated. The discontinuity between the initial branch and the large-amplitude, upper branch is studied in two ways. First, the time-averaged behavior is examined to understand what controls the discontinuity and look for damping and Reynolds number effects. Second, we track the cycle-by-cycle transient response through this discontinuous amplitude change, induced either by changes in the tunnel velocity or system damping. Finally, we also find a new discontinuity hysteresis region between the lower branch and the desynchronized region, which appears to be a low Reynolds number effect and is only seen in systems with Reynolds number < 1000.</p
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