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Coral colony Drag coefficients

Coral colony Drag coefficients. Lianna Samuel- oceans colloquium. Motivation. Forces. Lift. Flow. Drag. Inertia. Big question. ?. SET UP. Drag force & C d. specimens. P. compressa. P. verrucosa. S. pistillata. Set-up validation. coral results. Wiffle ball. Force in waves.

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Coral colony Drag coefficients

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  1. Coral colony Drag coefficients Lianna Samuel- oceans colloquium

  2. Motivation

  3. Forces Lift Flow Drag Inertia

  4. Big question ?

  5. SET UP

  6. Drag force & Cd

  7. specimens P. compressa P. verrucosa S. pistillata

  8. Set-up validation

  9. coral results

  10. Wiffle ball

  11. Force in waves

  12. Log10( )

  13. conclusions • Drag is the dominant force • Solid body drag force equation for a sphere under-predicts drag on corals • 1340% at low Re • 35% at high Re • Higher frontal area to volume ratio for branching corals has its benefits: • Higher rates of mass transfer • Higher rates of particle capture

  14. acknowledgements • Stephen Monismith • Jordanna Deane • Jeff Koseff • Uri Shavit • Stanford EFML

  15. questions

  16. Set-up

  17. Comparing results

  18. Other Results

  19. Cd = f(Re)

  20. future work • Evaluate drag forces directly for wave driven flows • Investigate the Inertial forces felt by a coral colony

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