Two-Dimensional Flow at Right Angles to a Flexible Membrane

1981 ◽  
Vol 32 (3) ◽  
pp. 243-269 ◽  
Author(s):  
B.G. Newman ◽  
H.T. Low
Keyword(s):  
Strouhal Number ◽  
Incompressible Flow ◽  
Separated Flow ◽  
Experimental Results ◽  
Two Dimensional ◽  
Flexible Membrane ◽  
Dimensional Flow ◽  
Two Dimensional Flow ◽  
Universal Correlation ◽  
Membrane Density

SummaryIncompressible flow perpendicular to a flexible, impervious membrane has been studied for two-dimensional conditions. The membrane was mounted on relatively thin supports spaced c apart. Measurements of drag, base pressure and the frequency of membrane oscillation are presented for various lengths ℓ, and for two densities, of membrane. These parameters are related to one another theoretically and in particular Bearman′s universal correlation for Strouhal number agrees with the experimental results. It is found that for values of< 0.50 the drag is independent of membrane density. The drag decreases at larger values ofand this is related to a periodic reattachment of the separated flow to the back of the membrane. For a given ℓ the drag is greatest whenis very small and the membrane is almost flat.

Calculation of Diffuser Efficiency for Two-Dimensional Flow

1947 ◽  
Vol 14 (3) ◽  
pp. A213-A216
Author(s):  
R. C. Binder
Keyword(s):  
Boundary Layer ◽  
Incompressible Flow ◽  
Potential Flow ◽  
Layer Growth ◽  
Two Dimensional ◽  
Dimensional Flow ◽  
Check Calculation ◽  
Two Dimensional Flow ◽  
Boundary Layer Growth ◽  
Potential Velocity

Abstract A method is presented for calculating the efficiency of a diffuser for two-dimensional, steady, incompressible flow without separation. The method involves a combination of organized boundary-layer data and frictionless potential-flow relations. The potential velocity and pressure are found after the boundary-layer growth is determined by a trial-and-check calculation.

Perspective: Selected Benchmarks From Commercial CFD Codes

1995 ◽  
Vol 117 (2) ◽  
pp. 208-218 ◽  
Author(s):  
C. J. Freitas
Keyword(s):  
Three Dimensional ◽  
Separated Flow ◽  
Policy Statement ◽  
Two Dimensional ◽  
Three Dimensional Flow ◽  
Common Reference ◽  
Reynolds Number Flow ◽  
Flow Problems ◽  
Dimensional Flow ◽  
Two Dimensional Flow

This paper summarizes the results of a series of five benchmark simulations which were completed using commercial Computational Fluid Dynamics (CFD) codes. These simulations were performed by the vendors themselves, and then reported by them in ASME’s CFD Triathlon Forum and CFD Biathlon Forum. The first group of benchmarks consisted of three laminar flow problems. These were the steady, two-dimensional flow over a backward-facing step, the low Reynolds number flow around a circular cylinder, and the unsteady three-dimensional flow in a shear-driven cubical cavity. The second group of benchmarks consisted of two turbulent flow problems. These were the two-dimensional flow around a square cylinder with periodic separated flow phenomena, and the steady, three-dimensional flow in a 180-degree square bend. All simulation results were evaluated against existing experimental data and thereby satisfied item 10 of the Journal’s policy statement for numerical accuracy. The objective of this exercise was to provide the engineering and scientific community with a common reference point for the evaluation of commercial CFD codes.

On the Two-Dimensional Theory of Incompressible Flow Over Inlets

1986 ◽  
Vol 53 (4) ◽  
pp. 947-951
Author(s):  
A. Sanz
Keyword(s):  
Incompressible Flow ◽  
Potential Flow ◽  
Two Dimensional ◽  
Dimensional Theory ◽  
Dimensional Flow ◽  
Two Dimensional Flow

The linearized solution for the two-dimensional flow over an inlet of general form has been derived, assuming incompressible potential flow. With this theory suction forces at sharp inlet lips can be estimated and ideal inlets can be designed.

Effect of Axial Velocity Variation in Aerofoil Cascades

1971 ◽  
Vol 13 (2) ◽  
pp. 92-99 ◽  
Author(s):  
S. Soundranayagam
Keyword(s):  
Wind Tunnel ◽  
Incompressible Flow ◽  
Axial Velocity ◽  
Three Dimensional ◽  
Velocity Variation ◽  
Two Dimensional ◽  
Dimensional Flow ◽  
Two Dimensional Flow ◽  
Wind Tunnel Data ◽  
Flow Through

The effect of the variation of axial velocity in the incompressible flow through a cascade of aerofoils is discussed and it is shown that changes take place in the flow angles and in the blade circulation. A method is proposed by which the effect of axial velocity variation on a known two-dimensional flow or alternatively the two-dimensional equivalent of a flow with axial velocity variation can be calculated. The method is very easy to apply. The deviation may increase or decrease depending on the change in blade circulation and the stagger. An increase in apparent deflection through the cascade can be accompanied by a reduction in the blade force. The method would be particularly useful for the interpretation of cascade wind tunnel data and in the design of impeller stages where three-dimensional flows occur.

Two-Dimensional Theory of Incompressible Flow Over Inlets

1982 ◽  
Vol 49 (2) ◽  
pp. 444-446
Author(s):  
M. K. Huang
Keyword(s):  
Incompressible Flow ◽  
Inviscid Fluid ◽  
Two Dimensional ◽  
Dimensional Theory ◽  
Dimensional Flow ◽  
Two Dimensional Flow

On the basis of the assumption of incompressible inviscid fluid, a linearized solution has been derived for the two-dimensional flow over an inlet of general form. The theory can be used to estimate the external drag of the inlets with sharp lips at subsonic speeds.

The Second Las Cruces Trench Experiment: Experimental Results and Two-Dimensional Flow Predictions

1991 ◽  
Vol 27 (10) ◽  
pp. 2707-2718 ◽  
Author(s):  
R. G. Hills ◽  
P. J. Wierenga ◽  
D. B. Hudson ◽  
M. R. Kirkland
Keyword(s):  
Experimental Results ◽  
Two Dimensional ◽  
Dimensional Flow ◽  
Two Dimensional Flow
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