1. ## the duck

took this shot at sunrise of the duck liked how the water was a golden colour

2. ## Re: the duck

Nicely captured Warren

3. ## Re: the duck

Good colours, Warren, and the duck's wake holds the shot together

5. ## Re: the duck

Great colors and awesome lighting. Nice job. Beautiful.

6. ## Re: the duck

This is a lovely picture but is also interesting from a mathematical point of view. Why are there ripples in front of the main wake?

7. ## Re: the duck

Tony, do you mean the bow wave? You have to go to computational fluid dynamics to understand it. My math education ended with basic difference and differential equations. And the way my brain currently computes I can't understand anything beyond simple optimization problems.

Warren, nice image.

karm

8. ## Re: the duck

Originally Posted by TonyW
This is a lovely picture but is also interesting from a mathematical point of view. Why are there ripples in front of the main wake?
Don't forget there is a mix of wake and turbulence generated by the paddling feet. I think the main wake starts outside the finer ripples. If the America cup had not moved onto catamarans you may have been able to ask one of their designers.

9. ## Re: the duck

Karm, yes I did mean the bow wave. Computational fluid dynamics is not needed to get the form of the wave. It's to do with group velocity and phase velocity coming out of complex variable analysis but I have forgotten most of this stuff in my retirement. The important thing is that it is beautiful photograph.

10. ## Re: the duck

thank you for the comments and the maths lesson

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