channelflow.org

====== Differences ====== This shows you the differences between two versions of the page.

--- chaosbook:pcf [2009/04/09 09:10]
wikiadmin
+++ chaosbook:pcf [2011/07/28 05:48] (current)
predrag the latest arXiv by Manneville
@@ Line 2: / Line 2: @@
 ====== A plane Couette blog ======
+(latest posts at the top)
-{{gtspring2009:gibson.png?24}} I am unsure of the purpose and scope of this page. All things plane Couette,
+{{gtspring2009:pc.jpg}} [[http://arxiv.org/abs/1101.2513|Pattern fluctuations in transitional plane Couette flow]] by Joran Rolland and  Paul Manneville looks interesting, about alternatively turbulent and laminar oblique bands. So does [[http://arxiv.org/abs/1101.5400|From temporal to spatiotemporal dynamics in transitional plane Couette flow]] by Jimmy Philip and Paul Manneville,
-as the title suggests (that would be like the NYT website having a special "News" subsection), or responses to reviews of n00bs, as the text suggests (in which case the title should reflect that). And you wonder why there
+[[http://arxiv.org/abs/1102.5703|Spatiotemporal perspective on the decay of turbulence in wall-bounded flows]] by Manneville, and [[http://arxiv.org/abs/1107.5442|On the decay of turbulence in plane Couette flow]] by Manneville.
-are page creation restrictions within my blog ... ;-) // John Gibson 2009-04-09//
- started here, as no permission to enter Gibson flatlands of Nebraska --- //[[predrag.cvitanovic@physics.gatech.edu|Predrag Cvitanovic]] 2009-04-08 07:53//
+{{gtspring2009:gibson.png?24}} Gritsun is working in a 200-d model of barotropic flow.
-(the latest posts within a section at the top, blog-style)
+{{gtspring2009:pc.jpg}} Andrey Gritsun work on unstable periodic orbits in atmospheric science sounds potentially interesting, but I have not been able to find anything to read about it.
+They have a 4-year old [[http://www.checkout.org.cn/awardsearch/showAward.do?AwardNumber=0530868|NSF grant]], a number of identical conference abstracts for different conferences in 2007, 2008 and SIAM DS09, but at most one publication: [[http://www.reference-global.com/doi/abs/10.1515/RJNAMM.2008.021|A. Gritsun.  "Unstable periodic trajectories of a barotropic model of the atmosphere,"  Russ. J. Numer. Anal. Math. Modelling,  v.23,  2008,  p. 345.]] I am not able to get the article through GaTech library, but from the abstract I do not think he is working with high-dimensional PDEs. There is [[http://hal.archives-ouvertes.fr/docs/00/33/10/47/PDF/npg-5-193-1998.pdf|Kazantsev work from 1998]], Gritsun work seems to be a continuation. [[http://ljk.imag.fr/membres/Kazantsev/publi_my.html|Kazantsev]] belongs to the Maryland school of citing, and builds upon the nonsensical formulas of Z---i and Gr------e, but might be worth a read for understanding what the problem is and his methodology of finding periodic orbits. Does not [[http://arxiv.org/find/all/1/all:+AND+Eugene+Kazantsev/0/1/0/all/0/1|do this stuff any more.]]--- //[[predrag.cvitanovic@physics.gatech.edu|Predrag Cvitanovic]] 2009-05-01//
+{{gtspring2009:gibson.png?24}} I saw the Li, Lin paper on arxiv but have not yet studied it in depth. It is interesting. Velocity fields rule!
-===== EQ8 =====
+{{gtspring2009:pc.jpg}} [[http://arxiv.org/abs/0904.4676|A Resolution of the Sommerfeld Paradox]] looks like a paper we should study.  --- //[[predrag.cvitanovic@physics.gatech.edu|Predrag Cvitanovic]] 2009-05-01 04:52//
-:-D  to	Tomoaki Itano //<itano@ipcku.kansai-u.ac.jp>//:
+{{gtspring2009:gibson.png?24}}  Re google code: maybe. I want/plan to move channelflow svn from the GT physics dept, so that it can be seen by the world. Maybe putting it on google code would be good, the whole channelflow website, less likely. The main benefit of channelflow.org is easily-editable pages via dokuwiki. My experience with massive code-hosting sites (freshmeat.net, gnu's savannah.org) is that they're totally inflexible (e.g. probably no dokuwiki), and that not having shell access makes administration a major pain. But I will check it out.
-\\
+//Twenty minutes later// Hmmm, there is almost no documentation available for code.google.com, nothing that explains what features are support, how much disk space is allowed, etc. Just "click here to host my project". 2009-05-04.
-Dr Itano, I've received a copy of your paper through one of my colleagues.  (I'm
-currently without a university affiliation).  It is very interesting.
-Your new equilibria seem similar to those that we refer to as EQ7 and
-EQ8, and what Schmiegel referred to as σ in his 1999 thesis.
-But, without a copy of your data we cannot say for sure.  Have you
-compared your solution to the ones that we have posted at
-www.channelflow.org? ---  // [[http://www.cns.gatech.edu/~jhalcrow/|The Prodigal Son]] 2009-04-08//
-{{gtspring2009:gibson.png?24}}  Professors these days --don't they read anything? The database also
+{{gtspring2009:pc.jpg}} [[http://www.nordita.org/~brandenb/|Axel Brandenburg, Nordita, Stockholm]]:
-shows the first posting: 2008-05-09. We should note in the paper and in a note to
+  * recommends strongly to replace home-maintained website channelflow.org by the google code site, which is free and safer than a locally maintained site (they still copy the entire svn repository to their site, so if google turns evil, one does not lose any of the repository.
-Itano that EQ8 was likely first discovered by Schmiegel in 1999. I'll
+    * example: [[http://www.nordita.org/software/pencil-code/|The Pencil  Code]] is maintained on [[http://pencil-code.googlecode.com/|pencil-code.googlecode.com/]]. Alex has made JohnG a 'project member,' so JohnG can enter and play with the site. Things like svn logs are nicer when displayed on googlecode.com - for example, one can diff on the webiste, without a local svn up.
-do what I can to verify that the Schmiegel, our EQ8 and Itano solutions are the same. ---  // John Gibson 2009-04-08//
+  * In a paper (on his homepage, but I forgot which paper) they showed that one should not plot //(I(t),D(t))// but //(I(t),D(t+T))//, where on varies the delay time //T// until most of this plot aligns itself along the diagonal. The idea is that enrgy is injected at //I(t)//, but then it takes some time //T// for it to be dissipated by vorticity. In their astrophysical application this causes a nice data collapse.
-:-D  My earliest record is the svn  commit 552 to n00bs on May 6 by John,  in
-which he says "2 new EQB pairs for narrow box, one NB/NB2-like, one EQ5/EQ6-like.
-Found from exhaustive search on a long-lived NB unstable manifold trajectory.
-Eigenvalues to follow." Did Itano send you guys his data?  I haven't heard from him
-since the email below.
----  // [[http://www.cns.gatech.edu/~jhalcrow/|The Prodigal Son]] 2009-04-08//
-{{gtspring2009:pc.jpg}} I'm writing this to a referee: "... one of our solutions (EQ8 found by John Gibson
-on May 6, 2008, posted on [[http://arxiv.org/abs/0808.3375|arXiv.org:0808.3375]] Aug 25, 2008) was discovered independently and a letter submitted to PR Lett. on Aug 20, 2008 [[http://link.aps.org/doi/10.1103/PhysRevLett.102.114501|[Itano and Generalis 2009]]]. This single solution was [...] published as a cover article of Physics Review Letters."
-:-D  to	Tomoaki Itano //<itano@ipcku.kansai-u.ac.jp>//:
-\\
-Dr Itano, Congratulations on making the cover of PRL.  I would be happy to
-compare your solution to the ones we've found.  Along with the data,
-could you please also send me a copy of your paper?  We have our
-solutions posted at
-[[http://www.channelflow.org/dokuwiki/doku.php/database|Channelflow.org/dokuwiki/doku.php/database]] if you'd like to
-see them. ---  // [[http://www.cns.gatech.edu/~jhalcrow/|The Prodigal Son]] 2009-03-24//
--) Tomoaki Itano to Harclow:
+{{gtspring2009:pc.jpg}}  grin and bear it. You have now entered the Couette Universe --- //[[predrag.cvitanovic@physics.gatech.edu|Predrag Cvitanovic]] 2009-04-10 09:44//
-\\
-My name is Tomoaki Itano and I am the corresponding author
+{{gtspring2009:gibson.png?24}} I am unsure of the purpose and scope of this page. All things plane Couette,
-of the recent article [[http://link.aps.org/doi/10.1103/PhysRevLett.102.114501|Phys Rev Lett 102, 114501 (2009)]]
+as the title suggests (that would be like the NYT website having a special "News" subsection), or responses to reviews of n00bs, as the text suggests (in which case the title should reflect that). And you wonder why there
-that has actually made the cover of the Journal for its current issue.
+are page creation restrictions within my blog ... ;-) // John Gibson 2009-04-09//
-We had a lengthy refereeing process that lasted for many months.
-In fact, we, my collaborator and I, had the results ready for publication
+ started here, as no permission to enter Gibson flatlands of Nebraska --- //[[predrag.cvitanovic@physics.gatech.edu|Predrag Cvitanovic]] 2009-04-08 07:53//
-for sometime now, but there was some discomfort from the referees to
-publish our __new Couette__ solution.
+(the latest posts within a section at the top, blog-style)
+===== EQ8 =====
+moved this to [[gtspring2009:gibson:eq8]]
-At the final stage of this refereeing process,
-one of the referees asked us to contact your group
-for the purpose of comparing our results, pointing out to us
-your paper that you have submitted on the preprint archive.
-We take this opportunity therefore to make contact with you and
-perhaps compare data and/or opinions about the
-data presented in our independent works.
-\\
-Yours sincerely,
-Tomoaki Itano, PhD. ---  //<itano@ipcku.kansai-u.ac.jp> Mar 24, 2009//

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