Summary statistics of cylinder wake variables and trout kinematic variables for five experimental treatments
| Variable . | smD2.5 . | smD4.5 . | laD4.5 . | FS . | BW . |
|---|---|---|---|---|---|
| Vortex shedding frequency (Hz) | 2.24±0.01 | 4.02±0.02 | 2.22±0.01 | - | - |
| Tail-beat frequency (Hz) | 2.10±0.04 | 3.71±0.05 | 2.18±0.05* | 6.62±0.11 | 4.34±0.24 |
| Cylinder wake wavelength (L) | 1.12±0.01 | 1.12±0.01 | 2.03±0.01 | - | - |
| Body wavelength (L) | 1.57±0.04 | 1.50±0.03 | 4.05±0.22 | 1.15±0.02 | 1.21±0.03 |
| Snout amplitude (L) | 0.02±0.01 | 0.02±0.01 | 0.16±0.02 | 0.02±0.01 | 0.02±0.01 |
| COM amplitude (L) | 0.01±0.01 | 0.02±0.01 | 0.15±0.01 | 0.02±0.01 | 0.01±0.01 |
| 50% L amplitude (L) | 0.05±0.01 | 0.05±0.01 | 0.17±0.01 | 0.02±0.01 | 0.02±0.01 |
| Tail-beat amplitude (L) | 0.14±0.01 | 0.16±0.01 | 0.32±0.02 | 0.11±0.01 | 0.09±0.01 |
| Max. body curvature (1/L) | 1.60±0.06 | 1.83±0.06 | 2.09±0.09 | 1.71±0.06 | 1.16±0.09 |
| Location of max. curvature (L) | 0.74±0.01 | 0.74±0.01 | 0.71±0.01 | 0.76±0.01 | 0.78±0.01 |
| Distance downstream from cylinder (L) | 1.68±0.03 | 1.77±0.05 | 1.92±0.05 | - | - |
| Maximum head angle (degrees) | 16.53±0.54 | 14.74±0.49 | 16.76±0.96 | 12.96±0.40 | 10.46±0.65 |
| Slip | 0.77±0.02 | 0.82±0.01 | 0.55±0.02 | 0.60±0.01 | 0.93±0.06 |
| Strouhal number | 0.24±0.01 | 0.26±0.01 | 0.31±0.01 | 0.32±0.01 | 0.17±0.01 |
| Variable . | smD2.5 . | smD4.5 . | laD4.5 . | FS . | BW . |
|---|---|---|---|---|---|
| Vortex shedding frequency (Hz) | 2.24±0.01 | 4.02±0.02 | 2.22±0.01 | - | - |
| Tail-beat frequency (Hz) | 2.10±0.04 | 3.71±0.05 | 2.18±0.05* | 6.62±0.11 | 4.34±0.24 |
| Cylinder wake wavelength (L) | 1.12±0.01 | 1.12±0.01 | 2.03±0.01 | - | - |
| Body wavelength (L) | 1.57±0.04 | 1.50±0.03 | 4.05±0.22 | 1.15±0.02 | 1.21±0.03 |
| Snout amplitude (L) | 0.02±0.01 | 0.02±0.01 | 0.16±0.02 | 0.02±0.01 | 0.02±0.01 |
| COM amplitude (L) | 0.01±0.01 | 0.02±0.01 | 0.15±0.01 | 0.02±0.01 | 0.01±0.01 |
| 50% L amplitude (L) | 0.05±0.01 | 0.05±0.01 | 0.17±0.01 | 0.02±0.01 | 0.02±0.01 |
| Tail-beat amplitude (L) | 0.14±0.01 | 0.16±0.01 | 0.32±0.02 | 0.11±0.01 | 0.09±0.01 |
| Max. body curvature (1/L) | 1.60±0.06 | 1.83±0.06 | 2.09±0.09 | 1.71±0.06 | 1.16±0.09 |
| Location of max. curvature (L) | 0.74±0.01 | 0.74±0.01 | 0.71±0.01 | 0.76±0.01 | 0.78±0.01 |
| Distance downstream from cylinder (L) | 1.68±0.03 | 1.77±0.05 | 1.92±0.05 | - | - |
| Maximum head angle (degrees) | 16.53±0.54 | 14.74±0.49 | 16.76±0.96 | 12.96±0.40 | 10.46±0.65 |
| Slip | 0.77±0.02 | 0.82±0.01 | 0.55±0.02 | 0.60±0.01 | 0.93±0.06 |
| Strouhal number | 0.24±0.01 | 0.26±0.01 | 0.31±0.01 | 0.32±0.01 | 0.17±0.01 |
Values are means ± S.E.M. (N=8 for all treatments except for BW, N=5).
L, total body length.
Treatments: smD2.5, 2.5 cm diameter cylinder at 2.5 Ls-1; smD4.5, 2.5 cm diameter cylinder at 4.5 Ls-1; laD4.5, 5 cm diameter cylinder at 4.5 Ls-1; FS, free stream at 4.5 L s-1; BW, bar wake of 5 cm diameter cylinder at 4.5 L s-1.
Not significantly different from the corresponding vortex shedding frequency (P=0.48).