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The generation of turbulence from displaced cross-members in uniform flow

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Abstract

This paper presents details of an experimental investigation into the nature of turbulence generated in the wake of a single grid node. The latter has been considered as two members placed perpendicular to each other in the geometry of a cross, with square and circular sections representing bars and rods respectively. The effect of member spacing has been examined in an attempt to identify the complex flow phenomena associated with such a configuration, and in this respect a critical gap width has been found.

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Abbreviations

C p :

pressure coefficient, (p — p 0)/1/2 ϱ U 20

C pb :

pressure coefficient measured on the base centre-line

C ps :

pressure coefficient measured at stagnation point

D :

diameter/section depth of model

L :

distance between central axis of two cylinders or bars

n :

vortex shedding frequency

p :

local pressure on model's surface

p 0 :

static pressure

R (τ) :

autocorrelation coefficient

R e :

Reynolds number, DU 0/v

St :

Strouhal number, n D/U 0

U 0 :

mean freestream velocity in X-direction

ovu :

local mean velocity in X-direction

u′ :

velocity fluctuation in X-direction

ovv :

local mean velocity in Y-direction

ovw :

local mean velocity in Z-direction

X :

cartesian co-ordinate in longitudinal direction

Y :

cartesian co-ordinate perpendicular to wind tunnel floor

Z :

cartesian co-ordinate in lateral direction

μ :

dynamic viscosity of fluid

v :

kinematic viscosity of fluid, μ/ϱ

φ n :

spectral energy, 4 ∫0 ∞ R (τ) cos 2 π n τ dτ

ϱ :

density of fluid

ω x :

longitudinal component of vorticity, ∂ϖ/∂y − ∂ΰ/∂z

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Authors and Affiliations

  1. Dept. of Civil Engineering, University of Surrey, GU2 5XH, Guildford, Surrey, Great Britain

    T. A. Fox & N. Toy

Authors
  1. T. A. Fox
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  2. N. Toy
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Fox, T.A., Toy, N. The generation of turbulence from displaced cross-members in uniform flow. Experiments in Fluids 6, 172–178 (1988). https://doi.org/10.1007/BF00230729

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  • DOI: https://doi.org/10.1007/BF00230729

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