resistance test in wave conditions

Not sure what you mean by "negative eddy", but is has a lot on natural viscious mixing due to things like density layers, jet flows, and falling objects.

Isn't "repeatable turbulence" an oxymoron? ....I mean if it is repeatable isn't it by definition a "vibration" no matter how long the period, i.e. a step function happens once and only once.....after that it is a periodic function....

 

Yes it is, but I can't think of a better term for it.
Maybe turbulence within a given fixed range of intensity would have been better.

 

Or repeatable as far as the relevant probability statistics are concerned.

Vibrations are generally considered to repeat with one or more fixed periods/frequencies. Of course if enough frequencies are considered any reasonable continuous but random function can be approximated to the desired level of accuracy.

 

Uncertainity actually, lol

I spent a lot of time wallowing around in that tar pit trying to predict peak motions and loads in waves...I wouldn't advise it. Better to use stoichastic spectral analysis and then walk away knowing you did your best.

 

Uncertainty actually, pedantic lol

All I want is a way of producing reasonably consistent large values of the horizontal and vertical eddy viscosity in a tank.
Maybe I should use a tar pit.

 

To paraphrase Fermi "If I could have spelt better, I would have been a writer." I blame the English school system where I learned my colours.

 

Agree. I was commenting on the theory, not what is a reasonable approach.