Diabatic wind and temperature profiles, The

CER69-70HC-JEC-18.December 1969.Includes bibliographical references (page 13).Prepared for U.S. Army Research Grant DA-AMC-28-043-65-G20.KEYPS model and Monin-Obukhov's log-linear model were examined pertaining to their adequacy of describing wind and temperature profiles in thermally stratified shear flows for diversified thermal stability. The dimensionless wind shear and lapse rate for all ranges of thermal stability studied, - 2 .0 ≤ Ri ≤ 0.4, were shown to be linearly dependent on the dimensionless height derived from the log-linear model. Deacon numbers behaved quite differently from what were predicted by KEYPS model.Under grant DA-AMC-28-043-65-G20

Power law profiles in thermally stratified shear flows

CER69-70-HC-JEC-19.December 1969.Includes bibliographical references (page 12).Prepared for U.S. Army Research Grant DA-AMC-28-043-65-G20.A "power law'' model is used to describe the wind and temperature profiles in thermally stratified shear flows for bulk Richardson numbers from - 0.8 to 0.2. It is shown that the power of wind and temperature profiles were not independent of the thermal stability and that similarity between wind and temperature profiles is good. Functional dependence of the power upon the thermal stability is shown for data of Prairie Grass and laboratory measurements.Under grant DA-AMC-28-043-65-G20

Mass diffusion from a point source in a turbulent boundary layer over a rough surface

CER66-67JEC-SB25.September 1966.Includes bibliographical references.Turbulent diffusion of dynamically passive and chemically nonreactive matter from a simulated point source within a two-dimensional boundary-layer flow over a rough surface was studied. A rough surface consisting of two-dimensional roughness elements (wooden strips, 0.25 in. high, 0.25 in. wide, and 6.0 ft. long, placed 3.0 in. apart normal to the flow direction) was used with the source at three different heights. The free-stream velocity of air for most of the runs was 12.50 ft./sec. Concentrations of the diffusing plume were measured at several downstream distances from the point source located at heights of 0.0625 in., 0.5 in., and 1.0 in. above the rough surface. Anhydrous ammonia was used as the tracer gas. Both vertical and lateral concentration profiles were found to be self- similar in the fully developed regions of the concentration field. The concentration distribution for such regions is described by two dimensionless universal functions, one for the case of source height h = 0.0625 in. and the other for the cases of source heights h = 0.5 in. and h = 1.0 in. These are obtained by expressing the relative concentration C/Cmax in terms of position length parameters n and o- diffusing plume as length scales. The vertical and lateral length scales (n, and o- respectively) of the plume have been related to the downstream distance from the source by empirical equations valid within the range of the experimental variables. The Lagrangian similarity hypothesis was tested by means of the experimental data and found to agree reasonably well with the data for the attenuation of maximum ground-level concentration in the longitudinal direction. Experimental results for the growth of the plume height and width with downstream distance from the source are in fair agreement with predictions of the hypothesis. However, in view of the experimental data, further investigations are necessary for a conclusive test of the hypothesis which seems to afford a rational basis for describing the gross characteristics of the diffusing plume within a turbulent boundary layer

Wind loads on a house roof

CER72-73KJD-JEC22.March 1973.Includes bibliographical references (pages 40-42).Prepared under National Bureau of Standards Contract No. NBS 273-70.Circulating copy deaccessioned 2020.The wind loads on the roof of a house were experimentally investigated by placing a 1:50 scale model house in a wind tunnel capable of generating thick, turbulent shear flows. The effects of roof geometry and wind direction were isolated by making the wind-tunnel flow representative of natural winds over very flat, open terrain. This flow simulation was accomplished by placing vortex generators at the entrance to the wind-tunnel test section. Mean pressures, root-mean-square values of the fluctuating pressures, and instantaneous peak pressures were measured at 11 preselected locations on the model's roof for 24 wind directions. A secondary purpose of the study was to determine the effects of an upwind fence on the roof pressures

Wind-tunnel study of 601 Main Street, Tulsa

CER82-83JAP-JEC30.Prepared for Markborough Properties Limited through WZMH Group Inc.Includes bibliographical references (page 25).January 1983.This model study was undertaken to define wind loads on the proposed 601 Main Street building in Tulsa. This building is a redesign of a building on the same site for which an earlier wind-tunnel study was performed

Wind-tunnel study of One South Wacker, Chicago

CER80-81JAP-JEC42.Prepared for C. F. Murphy Associates.Includes bibliographical references (page 24).February 1981

Mass transfer from rough surfaces

CER70-71SBV-JEC59.May 1971.Includes bibliographical references (pages 82-89).The work upon which this report is based was supported by funds provided by the United States Department of the Interior, Office of Water Resources Research, as authorized under the Water Resources Research Act of 1964 through contract no. 14-01-0001.Through contract no. 14-01-0001

Micrometeorological wind tunnel facility: description and characteristics

CER63EJP-JEC9.Includes bibliographical references (pages 39).February 1963

Measurement of turbulence in three-dimensional mean flow

CER68-69SPSA-JEC30.April 1969.Includes bibliographical references.Prepared under Office of Naval Research, project no. NR 062-414/6-6-68(Code 438), U.S. Department of Defense.A hot-wire anemometer for measuring turbulence in three-dimensional mean flow is presented. Effect of three-dimensionality of mean flow on a yawed wire's sensitivity to longitudinal, vertical and lateral fluctuations is brought out. A four-wire probe is shown to be suitable for measuring all the Dean flow and turbulent quantities of interest. Errors due to the cross flow component on turbulence measurements in two dimensional flows using conventional hot-wire techniques are estimated. Measurements of shear are shown to be very sensitive to even small amounts of cross flow that might be present in many laboratory and field flows of interest.Under contract no. N00014-68-A-0493-0001

Wind tunnel studies and simulations of turbulent shear flows related to atmospheric science and associated technologies : annual report

CER69-70JEC-8.June 1969.Includes bibliographical references (page 18).Prepared under Contract DAAB-07-68- C-0423 United States Army Electronics Command Fort Monmouth, New Jersey.For Atmospheric Sciences Laboratory U.S. Army Electronics Command Fort Monmouth , N. J.Under contract DAAB-07-68- C-0423