gtspring2009
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gtspring2009 [2010/10/25 19:26] predrag link to FEniCS project |
gtspring2009 [2011/08/04 08:07] predrag Woods Hole report |
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| + | {{gtspring2009:pc.jpg }} Woods Hole GFD snippets: Listening to [[http://www.mech.kth.se/~henning/|Dan Hennignson]]: watching their movies of the boundary layer is very fascinating - if you find them on their homepage, please put a link here. Used 5000 processors for 6 months; amounts to 40 cm of Boing 747. Wu & Moin recent work claims that the initial forest of hairpin vortices. Not correct. They do not look at as high Reynolds numbers. They do not get the averages right. Henningson results are much better, and the transition region does not persist. For plane Couette, 800 1/2 heights domain, showed a movie that shows that initial noisy conditions go into stripes. That justifies using smaller cells. | ||
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| + | Study this: They use Lagrange multipliers method to get to the adjoint Navier-Stokes evolution (this might be the way to deal with Domenico's noise evolution for hyperbolic fixed points, as well). Dan finds it remarkable that it works in optimized perturbation settings. This was discussed in detail in the talk "Questioning the question: The role of nonlinear optimal perturbations in the transition to turbulence of plane Couette flow" by [[http://www.damtp.cam.ac.uk/people/c.p.caulfield/|Colm-cille Caulfield]]. ([[http://en.wikipedia.org/wiki/Columba|Colm-cille]] is an Irish name). Concerning finite amplitude perturbations for plane Couette transition from laminar to optimal (Monokrousos et al (2011)): For dissipation norm, with the same energy disturbance, //localized// disturbances are optimal (but not too localized - would be interesting to understand the scale). Numerical observations support this - the point where transition happens are localized. He showed a few movies where localized -> vortex pair -> streak, grow due lift-up effect -> and pretty turbulent looking edge state. It is the Orr mechanism of generating a 2D packet (the strongest transient growth mechanism in 2D, a version of Kelvin circulation theorem), but it is essential that disturbance is 3D, or Orr mechanism would make the perturbation die away. --- //[[predrag.cvitanovic@physics.gatech.edu|Predrag Cvitanovic]] 2011/08/04 07:12// | ||
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| + | {{gtspring2009:pc.jpg }} If you want to fall asleep, [[http://www.jove.com/details.php?id=2152|biology video journal]] is the way to go. Still, it is intriguing way to publish, might be useful for complicated state-space narratives. --- //[[predrag.cvitanovic@physics.gatech.edu|Predrag Cvitanovic]] 2011-02-01 20:23// | ||
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| + | {{gtspring2009:pc.jpg }} [[http://www.openfoam.com/|www.openfoam.com]] open source CFD seems interesting --- //[[predrag.cvitanovic@physics.gatech.edu|Predrag Cvitanovic]] 2010-11-02 17:51// | ||
| {{gtspring2009:pc.jpg }} [[http://www.fenicsproject.org/wiki/FEniCS_Project|FEniCS project]] software for automated solution of differential equations looks interesting. --- //[[predrag.cvitanovic@physics.gatech.edu|Predrag Cvitanovic]] 2010-10-25 19:23// | {{gtspring2009:pc.jpg }} [[http://www.fenicsproject.org/wiki/FEniCS_Project|FEniCS project]] software for automated solution of differential equations looks interesting. --- //[[predrag.cvitanovic@physics.gatech.edu|Predrag Cvitanovic]] 2010-10-25 19:23// | ||
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| * Jeff, [[http://music-illuminati.com/|the flip side of]] | * Jeff, [[http://music-illuminati.com/|the flip side of]] | ||
| * [[http://www.youtube.com/watch?v=TdicSaJBwYQ|Ally Moe Designs fashion show beats Wet & Wild hands down.]] The distance form Jawja to Santa Barbara equals the distance form here to Dog Star. | * [[http://www.youtube.com/watch?v=TdicSaJBwYQ|Ally Moe Designs fashion show beats Wet & Wild hands down.]] The distance form Jawja to Santa Barbara equals the distance form here to Dog Star. | ||
| - | * The [[http://www.flickr.com/photos/birdtracks/sets/72157622595634417/|Hof lab]], featuring photos of the plane Couette experiement. So far in air only, the 3 tons of water will be added Jan 2010. --- //[[predrag.cvitanovic@physics.gatech.edu|Predrag Cvitanovic]] 2009-12-17 23:10// | + | * The [[http://www.flickr.com/photos/birdtracks/sets/72157622595634417/|Hof lab]], featuring photos of the plane Couette experiment. So far in air only, the 3 tons of water will be added Jan 2010. --- //[[predrag.cvitanovic@physics.gatech.edu|Predrag Cvitanovic]] 2009-12-17 23:10// |
| * The unofficial [[http://www.flickr.com/photos/birdtracks/sets/72157622720110890/|Prandtlitos Juniors]] homepage. --- //[[predrag.cvitanovic@physics.gatech.edu|Predrag Cvitanovic]] 2009-12-16 00:07// | * The unofficial [[http://www.flickr.com/photos/birdtracks/sets/72157622720110890/|Prandtlitos Juniors]] homepage. --- //[[predrag.cvitanovic@physics.gatech.edu|Predrag Cvitanovic]] 2009-12-16 00:07// | ||
gtspring2009.txt ยท Last modified: 2011/08/10 08:11 by predrag
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