Self-Sustained Oscillations in Flows Around Long Blunt Plates

Hourigan, Kerry; Thompson, Mark C.; Tan, Boon Thong

doi:10.1006/jfls.2000.0352

Cited by 120 publications

(109 citation statements)

References 17 publications

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“…That rectangular prisms with streamlined leading edges generate well-defined, clean, wake flows of a highly twodimensional nature has been well established in the literature (e.g. Okajima et al 1992;Hourigan et al 2001). Also, because, in the present study, the fish coasts behind the prism there are no body motions to deal with and, therefore, the periodically oscillating pressure signals arriving at the surface of the fish are due solely to the prism wake.…”

Section: Objectives Of This Studysupporting

confidence: 52%

Drag force acting on a neuromast in the fish lateral line trunk canal. I. Numerical modelling of external–internal flow coupling

Barbier

Humphrey

2008

J. R. Soc. Interface.

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Fishes use a complex, multi-branched, mechanoreceptive organ called the lateral line to detect the motion of water in their immediate surroundings. This study is concerned with a subset of that organ referred to as the lateral line trunk canal (LLTC). The LLTC consists of a long tube no more than a few millimetres in diameter embedded immediately under the skin of the fish on each side of its body. In most fishes, pore-like openings are regularly distributed along the LLTC, and a minute sensor enveloped in a gelatinous cupula, referred to as a neuromast, is located between each pair of pores. Drag forces resulting from fluid motions induced inside the LLTC by pressure fluctuations in the external flow stimulate the neuromasts. This study, Part I of a two-part sequence, investigates the motion-sensing characteristics of the LLTC and how it may be used by fishes to detect wakes. To this end, an idealized geometrical/dynamical situation is examined that retains the essential problem physics. A two-level numerical model is developed that couples the vortical flow outside the LLTC to the flow stimulating the neuromasts within it. First, using a Navier-Stokes solver, we calculate the unsteady flow past an elongated rectangular prism and a fish downstream of it, with both objects moving at the same speed. By construction, the prism generates a clean, periodic vortex street in its wake. Then, also using the Navier-Stokes solver, the pressure field associated with this external flow is used to calculate the unsteady flow inside the LLTC of the fish, which creates the drag forces acting on the neuromast cupula. Although idealized, this external-internal coupled flow model allows an investigation of the filtering properties and performance characteristics of the LLTC for a range of frequencies of biological interest. The results obtained here and in Part II show that the LLTC acts as a low-pass filter, preferentially damping high-frequency pressure gradient oscillations, and hence high-frequency accelerations, associated with the external flow.

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Section: Objectives Of This Studysupporting

confidence: 52%

Drag force acting on a neuromast in the fish lateral line trunk canal. I. Numerical modelling of external–internal flow coupling

Barbier

Humphrey

2008

J. R. Soc. Interface.

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“…These modes have distinct unstable spanwise wavelength bands and di!erent topologies. There are strong indications that the equivalent of mode A is the initial transition mode for a range of two-dimensional cylindrical bodies, from square cylinders (Robichaux et al 1999) to long plates with aerodynamic noses (Hourigan et al 2001). In addition, modes with the corresponding two distinct spatio-temporal symmetries have been observed in plane wakes both experimentally and numerically (Meiburg & Lasheras 1988).…”

Section: Introductionmentioning

confidence: 96%

The Physical Mechanism of Transition in Bluff Body Wakes

Thompson

Leweke

Williamson

2001

Journal of Fluids and Structures

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135

124

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“…On one hand, the lowReynolds number flow around rectangular cylinders has been clarified in both its 2D and 3D features by several studies (e.g. [3,4,5]. On the other hand, the high-Reynolds number flow (i.e.…”

Section: Introductionmentioning

confidence: 99%