Publications
199 results found
Graham JMR, Kullar I, 1981, EFFECT OF ASPECT RATIO ON THE UNSTEADY AERODYNAMIC FORCES INDUCED BY VIBRATION OF A CASCADE BLADE., Pages: 371-381
DEBERNARDINIS B, GRAHAM JMR, PARKER KH, 1981, OSCILLATORY FLOW AROUND DISKS AND THROUGH ORIFICES, JOURNAL OF FLUID MECHANICS, Vol: 102, Pages: 279-299, ISSN: 0022-1120
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- Citations: 17
McKeough PJ, Graham JMR, 1980, EFFECT OF MEAN LOADING ON THE FLUCTUATING LOADS INDUCED ON AEROFOILS BY A TURBULENT STREAM., Aeronautical Quarterly, Vol: 31, Pages: 56-69, ISSN: 0001-9259
Analyses the unsteady lift produced on a thin aerofoil by an arbitrary three-dimensional gust. In particular, it evaluates the effects of alpha , the angle of incidence of the aerofoil to the mean stream. A thin aerofoil theory which includes the effects of distortion of the turbulence by the mean flow field of the aerofoil is applied to the case of an aerofoil in isotropic turbulence. Some computed results are compared with measurements made on a NACA 0015 aerofoil in grid turbulence in a wind tunnel. It is shown that for isotropic turbulence the effect of mean incidence on the lift spectrum is of order alpha **2, and is significant at low frequencies for the length scale ratios tested.
MCKEOUGH PJ, GRAHAM JMR, 1980, EFFECT OF MEAN LOADING ON THE FLUCTUATING LOADS INDUCED ON AEROFOILS BY A TURBULENT STREAM, AERONAUTICAL QUARTERLY, Vol: 31, Pages: 56-69, ISSN: 0001-9259
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- Citations: 11
BEARMAN PW, GRAHAM JMR, 1980, VORTEX SHEDDING FROM BLUFF-BODIES IN OSCILLATORY FLOW - A REPORT ON EUROMECH-119, JOURNAL OF FLUID MECHANICS, Vol: 99, Pages: 225-245, ISSN: 0022-1120
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- Citations: 51
GRAHAM JMR, 1980, THE FORCES ON SHARP-EDGED CYLINDERS IN OSCILLATORY FLOW AT LOW KEULEGAN-CARPENTER NUMBERS, JOURNAL OF FLUID MECHANICS, Vol: 97, Pages: 331-&, ISSN: 0022-1120
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- Citations: 151
Graham JMR, 1979, Forces on cylindrical bodies in oscillatory flow at low Keulegan-Carpenter numbers.
The dependence of inertia and drag coefficients of cylindrical bodies in planar oscillatory flow on the Keulegan-Carpenter number at small values of the latter is analysed theoretically. The in-line force on the cylinder is divided into an attached flow inertia component and a vortex force associated with flow separation, and related to the rate of growth of vortices shed from the cylinder. Results for three different cross-sections (flat plate, square and circle) are compared with experimental data. (A)
Graham JMR, 1979, Forces on cylindrical bodies in oscillatory flow at low Keulegan-Carpenter numbers.
The dependence of inertia and drag coefficients of cylindrical bodies in planar oscillatory flow on the Keulegan-Carpenter number at small values of the latter is analysed theoretically. The in-line force on the cylinder is divided into an attached flow inertia component and a vortex force associated with flow separation, and related to the rate of growth of vortices shed from the cylinder. Results for three different cross-sections (flat plate, square and circle) are compared with experimental data. (A)
Bearman PW, Graham JMR, Singh S, 1979, Forces on cylinders in harmonically oscillating flow.
Measurements are presented of the forces experienced on a series of two-dimensional bodies in plane oscillatory flow over the Keulegan-Carpenter number range 3 to 70. As KSUPc increases above a value of about 15, flat plates, diamond and circular cylinders show similar variations of drag coefficient. A square section cylinder has a different behaviour and shows evidence of being sensitive to the turbulence in the wake flow swept back past the body. Flow visualisation studies demonstrate the importance of large discrete vortices. (A)
Bearman PW, Graham JMR, 1979, Hydrodynamic forces on cylinder bodies in oscillatory flow., IN: PROC. SECOND INT. CONF. ON THE BEHAVIOUR OF OFF-SHORE STRUCTURES, (LONDON, U.K.: AUG. 28-31, 1979), Vol: 1 , Cranfield, U.K., BHRA Fluid Engng., 1979, Paper 24, Pages: 309-322
This paper presents measurement of the in-line and transverse forces on several cylindrical bodies in plane oscilatory flow in a U-tube water channel over a range of Keulegan-Carpenter number from 3 to 70. Emphasis has been placed on bodies with sharp-edged separation. Flow visualisation studies are used to aid the discussion of the different modes of vortex shedding which occur and the relationship between the vortex shedding and the forces induced on the bodies. The root mean square of the in-line force is shown to remain fairly constant from cycle to cycle at fixed Keulegan Carpenter number, although there is considerable variation in the drag and inertial components. On the other hand the root mean square of the transverse force shows very large variations from cycle to cycle. An analysis of the forces induced by vortex shedding at low Keulegan Carpenter number is presented which leads to power law relationships for the drag and inertia coefficinets in Morison's equation . A numerical point vortex method of representing the flow theoretically is discussed and some results from calculations using this method for oscillatory flow past sharp edged cylinders are presented. (A)
Bearman PW, Graham JMR, Singh S, 1979, Forces on cylinders in harmonically oscillating flow.
Measurements are presented of the forces experienced on a series of two-dimensional bodies in plane oscillatory flow over the Keulegan-Carpenter number range 3 to 70. As KSUPc increases above a value of about 15, flat plates, diamond and circular cylinders show similar variations of drag coefficient. A square section cylinder has a different behaviour and shows evidence of being sensitive to the turbulence in the wake flow swept back past the body. Flow visualisation studies demonstrate the importance of large discrete vortices. (A)
HUNT JCR, GRAHAM JMR, 1978, FREE-STREAM TURBULENCE NEAR PLANE BOUNDARIES, JOURNAL OF FLUID MECHANICS, Vol: 84, Pages: 209-235, ISSN: 0022-1120
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- Citations: 248
GRAHAM JMR, KULLAR I, 1977, SMALL PERTURBATION EXPANSIONS IN UNSTEADY AEROFOIL THEORY, JOURNAL OF FLUID MECHANICS, Vol: 83, Pages: 209-224, ISSN: 0022-1120
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- Citations: 8
Graham JMR, 1976, Turbulent flow past a porous plate, Journal of Fluid Mechanics, Vol: 73, Pages: 565-591, ISSN: 0022-1120
The method of Vickery for calculating the drag of plane lattice structures normal to a turbulent stream is extended to cases of increased solidity. The analysis incorporates an extended version of Taylor's theory for the flow through a porous plate, and a simplified version of Hunt's analysis of the distortion of a turbulent flow by the mean flow field of a body. Some comparisons are made with experimental data. © 1976, Cambridge University Press. All rights reserved.
GRAHAM JMR, 1976, TURBULENT-FLOW PAST A POROUS PLATE, JOURNAL OF FLUID MECHANICS, Vol: 73, Pages: 565-591, ISSN: 0022-1120
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- Citations: 31
Graham JMR, 1973, LIFT FORCES ON CYLINDERS IN A TURBULENT FLOW., Vib Probl in Ind Int Symp
The paper describes some measurements of the spectrum of unsteady lift on elements of various two-dimensional bodies in a turbulent cross-flow. These measurements are compared with the results of a simplified quasi-linear prediction method based on the analysis of thin streamlined bodies in turbulence and the hypothesis of constant Strouhal number.
Graham JMR, Maull DJ, 1971, The effects of an oscillating flap and an acoustic resonance on vortex shedding, Journal of Sound and Vibration, Vol: 18, Pages: 371-380, ISSN: 0022-460X
Vortex shedding from the blunt trailing edge of a flat plate spanning a wind tunnel under two kinds of periodic excitation is described. The conditions under which these two forms of excitation, an oscillating flap and an acoustic resonance, cause the vortex shedding to be in phase along the span are compared. Particular attention is paid to cases when the natural shedding frequency and either the flap frequency or the centre frequency of the acoustic resonance, respectively, are not quite coincident. © 1971.
Graham JMR, 1970, Similarity rules for thin aerofoils in non-stationary subsonic flows, Journal of Fluid Mechanics, Vol: 43, Pages: 753-766, ISSN: 0022-1120
Similarity rules are constructed for the load distributions induced on a thin two-dimensional wing at subsonic speeds by sinusoidal gusts whose wave fronts are at an angle to the leading edge of the wing. It is shown that these rules divide into two groups according to the value of a parameter dependent on the Mach number and the angle between the gust front and the wing. The similarity rules for each group relate all the members of the group to a simpler problem whose solution can be found by existing methods. The similarity between the two groups is also discussed in terms of the two methods of solution available and it is shown that each method of solution is applicable in all cases. © 1970, Cambridge University Press. All rights reserved.
Graham JMR, 1966, Transverse forces on cylinders in random waves.
A quasi steady equation has been used with success to predict transverse forces on circular cylinders in sinusoidal oscillatory flow and waves. It has also been used previously to analyze the broadening of the spectrum of transverse force due to vortex shedding on bluff bodies in unidirectional turbulent flows. Considers the case of a circular cylinder in random oscillatory flows and unidirectional random waves. Time histories of transverse force and associated broadband spectra are computed using the same quasi steady equation and comparisons are made with measurements on a vertical cylinder in random waves using a JONSWOP spectrum for the incident waves.
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