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Hydrodynamic studies on two traveling wavy foils in tandem arrangement
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10.1063/1.2814259
/content/aip/journal/pof2/19/11/10.1063/1.2814259
http://aip.metastore.ingenta.com/content/aip/journal/pof2/19/11/10.1063/1.2814259

Figures

Image of FIG. 1.
FIG. 1.

(a) Physical model of the two-foil structure and definition of the coordinate system. (b) Dimensions of the computational domain.

Image of FIG. 2.
FIG. 2.

Illustration of a Lagrangian point and the surrounding virtual points.

Image of FIG. 3.
FIG. 3.

Description of the boundary topology with interface markers.

Image of FIG. 4.
FIG. 4.

Schematic of an oscillating cylinder in uniform flow ( denotes the cylinder diameter).

Image of FIG. 5.
FIG. 5.

Lift and drag coefficients time history at for the flow around a stationary circular cylinder.

Image of FIG. 6.
FIG. 6.

Wake structure for : (a) , numerical results; (b) , experiments (see Ref. 31); (c) , numerical results; and (d) , experiments (see Ref. 31).

Image of FIG. 7.
FIG. 7.

Time-averaged drag efficient and efficiency vs for : (a) mean drag efficient and (b) efficiency (see Ref. 34).

Image of FIG. 8.
FIG. 8.

Time-averaged drag coefficient vs member spacing for case T1. Symbols --, --, and -- denote , , and , respectively, for upstream fish. Symbols --, -○-, and -- denote , , and , respectively, for downstream fish. Solid line: for case S1. Dashed line: for case S1. Dash dotted line: for case S1.

Image of FIG. 9.
FIG. 9.

Time-averaged drag coefficient vs member spacing for case T2. Symbols --, --, and -- denote , , and , respectively, for upstream fish. Symbols --, -○-, and -- denote , , and , respectively, for downstream fish. Solid line: for case S2. Dashed line: for case S2. Dash-dotted line: for case S2.

Image of FIG. 10.
FIG. 10.

Time-averaged drag coefficient vs member spacing for case T3. Symbols --, --, and -- denote , , and , respectively, for upstream fish. Symbols --, -○-, and -- denote , , and , respectively, for downstream fish. Solid line: for case S3. Dashed line: for case S3. Dash-dotted line: for case S3.

Image of FIG. 11.
FIG. 11.

Vorticity contours over one period in case T3 (the solid lines denote positive values, the dashed line denote negative values, and “LR” denotes the lower-pressure region induced by the vortex shedding from the upstream fish). (a)–(d) Four sequential images with the time interval for . (e)–(h) Four sequential images with the time interval for .

Image of FIG. 12.
FIG. 12.

Mean -component velocities along the axis in the wake of an isolated fish for three different cases.

Image of FIG. 13.
FIG. 13.

Mean pressure coefficient profiles in the near wake of the upstream fish for various member spacings in (a) case T1 and (b) case T3.

Image of FIG. 14.
FIG. 14.

Efficiency vs member spacing. Dashed line denotes the efficiency of a single fish; symbol --, the efficiency of upstream fish; --, the efficiency of downstream fish; and -○-, the overall efficiency of the two-fish system. (a) Case T1, (b) case T2, and (c) case T3.

Image of FIG. 15.
FIG. 15.

Overall efficiency of the two-fish system vs member spacing: Symbol -- for case T4; -▴- for case T5; and -○- for case T6.

Tables

Generic image for table
Table I.

Simulation parameters in the case of two fish .

Generic image for table
Table II.

Simulation results for a single fish.

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/content/aip/journal/pof2/19/11/10.1063/1.2814259
2007-11-26
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Hydrodynamic studies on two traveling wavy foils in tandem arrangement
http://aip.metastore.ingenta.com/content/aip/journal/pof2/19/11/10.1063/1.2814259
10.1063/1.2814259
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