Flatfish Biomimetic Dynamic Mode
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Nominal Multi-r Mesh-Disc PTO Harmonics

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So far, we have only reviewed symmetrical disc harmonics as mult-r mesh dynamic modes. These have a sub-optimal relation to wind direction, as the leading side enjoys clean wind, but the trailing side is in a wake-zone.

Alternatively, flounders, skates, rays, and torpedos share a characteristic disc-like plan-form but have and associated swimming motion that similar-form muti-r meshes may apply for more efficient harmonic energy extraction.

The "flat-fish" biomimetic mode uses muscle-power to develop traveling edge waves forward that move aft, growing and, and converging, while the forward center-body stays mostly still. For multi-r mesh-disc energy extraction, time-symmetry is presumed, and the (reversed) leading edge would rise and plunge the most, and the edge-waves move aft, damped-away by PTO energy extraction, and the rearward area would stay relatively still.

Here are two typical similarity-case samples of the disc planform and swimming bio-dynamic. Some of these fish have extra locomotion modes, but all use locomotion edge-modes and many depend wholly on them. Performance is good, with long migrations and amazing bursts of speed enabled.

• Stingrays - Reef Life of the Andaman - Part 5   
  
• https://tinyurl.com/StingRayDiscIMAGES