User talk:Kraaiennest

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TUSC token 01b17fc5373bb6eea993dc86649366d1

I am now proud owner of a TUSC account! — Preceding unsigned comment added by Kraaiennest (talk • contribs) 14:04, 2 August 2008‎ (UTC)

Was there once an animated gif ...

... of something like this static image: File:Wave_motion-i18n-mod.svg? I used that animation on gewp.org, but it seems to be missing from Commons, now. I see deletions of earlier versions of this file. Was one of the deleted files animated? Or, am I looking in the wrong place? I no longer see any animations on the encyclopedia articles on waves, either. Was there possibly an error by assuming that the trace of a rolling circle is a Sin wave? I might re-do the animation if you are not. I already have code published on the trace of the tips of a Savonius rotor, and that is very similar math. See the top image on the homepage of http://www.youvan.com, and Example 19 please. Thank you, Kraaiennest / Crowsnest Doug youvan (talk) 18:03, 14 January 2012 (UTC)

Hello Doug youvan, my animations at Commons are listed here: [1], which hopefully contains also the one you search. I am not aware of animations being deleted. Regards, Kraaiennest (talk) 22:02, 15 January 2012 (UTC)

Now, I see the word Trochoid in your discussions, above, and tracked it into simple math that I should have known. I will copy this to my own Talk page if you have anything to say. When I was writting code for the Savonius Rotor, I did not know the term "Trochoids". But I did come to the same independent conclusion / math / code. Doug youvan (talk) 01:19, 15 January 2012 (UTC)

Dear Crow, I found a backup of my deleted gewp.org site and the file name. I searched that name on Google and found: http://commons.wikimedia.org/wiki/File:Deep_water_wave.gif . It's usage is on wikis other than in English. Is something like that file currently in use by you anywhere on en. ? Also, would you share that source code with me? I would like to re-write in Mathematica with proper attribution to you. Doug youvan (talk) 16:38, 21 January 2012 (UTC)

Hello Doug Youvan, File:Deep water wave.gif is in use on en-wiki in "Wind wave" and in "Stokes drift". The wave physics are computed with the Rienecker & Fenton (R&F) streamfunction theory; for a computer code to compute these see: J.D. Fenton (1988) "The numerical solution of steady water wave problems". Computers & Geosciences 14(3), pp. 357–368. The animations are made from the R&F results with a series of Matlab scripts and batch files. Regards, Kraaiennest (talk) 21:13, 21 January 2012 (UTC)

Dear Crow, Thanks for all that information. Is there anything you would like to see done in Mathematica from scratch? I would do the coding at your direction. The contribution here to Commons would be done jointly. Links in the description of the image could be made out to Wolfram's CDF player and the actual code could be deposited elsewhere such that anyone could download the CDF Player (free) and adjust parameters within our code. I would suggest re-doing File:Deep water wave.gif so that the new code could be checked. The custom code we deposit (elsewhere) would be freeware. A second possibility is to write code for a parameterized interferometer using this same scenario of an image deposited here on Commons, links to custom freeware, and a link to the CDF Player.

A search for "J D Fenton Ocean Waves" yields many on-line calculators: http://pipeng.com/index.php/ms/keyword/detail/Ocean%20Wave%20:%20Calculator .Doug youvan (talk) 17:12, 22 January 2012 (UTC)

Dear Crow, May I have a copy of the source code that was used to make File:Deep water wave.gif? As you know, I would like to re-do this work in Mathematica and make it public domain, and it would be very nice if this were a joint project between us. In addition to Commons, http://demonstrations.wolfram.com/MotionOfParticlesInOceanWaves/ would be a great place to deposit in Wolfram CDF as an educational game. One could make parameters of amplitude and period of an ocean wave and make a game of a Stokes Ball Race! Someone else has already deposited a Rogue Wave simulation. Doug youvan (talk) 23:31, 30 January 2012 (UTC)

Dear Doug Youvan, I do not intent to make the code available, since it is (in part) the property of others. The code has been extensively validated against the results of similar codes by others. I pointed out before the Fenton paper, which contains a full source code to compute these kinds of waves, which you can use as a basis for your plans. Further, I personally have no interest in joint projects (of code development, Mathematica stuff, animations, etc.). Best regards, Kraaiennest (talk) 01:39, 2 February 2012 (UTC)

Dear Crow, I trust you have seen the level of energy that children place into worthless video games. We really have a chance here to develop something entertaining and educational. Would you at least consider donating code into the Mathematica site I have referenced, above? If needed, I will gladly grant you funds to do so through my Foundation to do the re-coding. I have no other motives other than seeing my son, now age 7, and other children like him, play games that are educational. Consider this an end-of-life, philanthropic goal of mine. I think you know me well enough to understand that I am not playing games (no pun intended) with you. Doug youvan (talk) 03:47, 2 February 2012 (UTC)

FYI, I have begun emailing people in your field in an attempt to find your colleagues who did this programming. I am now of the opinion that it is the programmers, not the uploader of this work, who should be cited as authors. That's still another reason for you and I to re-do the code and place it in the public domain: The authorship would be clean and clear. Doug youvan (talk) 00:35, 4 February 2012 (UTC)

Hello Doug, good luck and fun with your project! Regards, Kraaiennest (talk) 14:25, 5 February 2012 (UTC)

Hi Kraaiennest; I don't see that you were notified of a Village Pump discussion that may involve you. --Walter Siegmund (talk) 17:37, 6 February 2012 (UTC)

Yes Crow, Please join us. If you are candid and honest, the WMF gets $100,000! Doug youvan (talk) 03:24, 7 February 2012 (UTC)

I went back down to $10K and placed an image of the cashiers check in that discussion. I am also transplanting this statement you made: "Dear Doug Youvan, I do not intent to make the code available, since it is (in part) the property of others." Doug youvan (talk) 16:02, 7 February 2012 (UTC)

File:Bous2d berk03 z.gif

Ontzettend bedankt voor deze! Erg nuttig voor colleges over golven en optica. Groeten, /Pieter Kuiper (talk) 09:58, 8 February 2012 (UTC)

Dank je wel! -- Kraaiennest (talk) 10:02, 8 February 2012 (UTC)

I agree with Pieter Kuiper. That is a educational and pleasing animation.

I added the patrol right to your account.[2] --Walter Siegmund (talk) 21:47, 8 February 2012 (UTC)

Thank you very much, Walter! Best regards, Kraaiennest (talk) 17:12, 9 February 2012 (UTC)

Pseudocolored Deep Water Wave

Dear Crow, Could you write down an equation for me that would describe every pixel in a deep water wave as a function of our display coordinates, amplitude, period, and time (x,y,A,P,t)? I would like to try an orthonormal 3-axis (120 degree) pseudocoloring scheme to indicate velocity (speed s, direction d) of each pixel. Get it?

You don't have to worry about this part, but I will use a 0-1 color scaling for RGB:

v=0: Black {0,0,0};

maximum velocity up: Red (r,0,0};

maximum velocity towards 120 degrees: Green {0,g,0};

maximum velocity towards 240 degrees: Blue {0,0,b}.

Little r,g,b will be scaled for maximum velocity in any direction, and then all pixel velocity will be projected onto this tri-color-axis. For example, velocity in the direction of 60 degrees will be colored Yellow, 180 is Cyan, and 300 is Magenta. All 360 degrees get a different color by an algorithm and the intensity of those colors is proportional to speed. For each frame, I will pseudocolor for how the pixels will move into the next frame.

Thanks, Doug youvan (talk) 01:29, 9 February 2012 (UTC)