gtspring2009:predrag:blog
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gtspring2009:predrag:blog [2010/12/12 17:49] (current) predrag variational method for long orbits? |
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| + | **2010-12-13** | ||
| + | There are people who promise to US military to find long (relative) periodic orbits in boundary sheer flows by variational methods, for a significant amount of money. They presumably do not mean it, but just in case someone does: [[http://en.wikipedia.org/wiki/L-BFGS|L-BFGS]] algorithm (one of quasi-Newton optimization methods) might be the method to implement. | ||
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| + | **2010-11-20 Probably should have a look at this paper:** | ||
| + | Schneider Tobias M.; De Lillo Filippo; Buehrle Juergen; Eckhardt Bruno; Dörnemann Tim; Dörnemann Kay; Freisleben Bernd | ||
| + | //Transient turbulence in plane Couette flow// | ||
| + | Phys. Rev. E 81, 015301 (2010) | ||
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| + | **2010-06-09 Paul Manneville and Joran Rolland:** [[http://arxiv.org/abs/1010.2125|On modelling transitional turbulent flows using under-resolved direct numerical simulations: The case of plane Couette flow]]. | ||
| + | While the dynamics of the transition from laminar flow to turbulence via localised spots can be investigated with reasonable computing resources in domains of limited extent, the study of the decay of turbulence in conditions approaching those in the laboratory requires consideration of domains so wide as to exclude the recourse to fully resolved simulations. Using Gibson's C++ code ChannelFlow, we scrutinize the effects of a controlled lowering of the numerical resolution on the decay of turbulence in plane Couette flow at a quantitative level. We show that the number of Chebyshev polynomials describing the cross-stream dependence can be drastically decreased while preserving all the qualitative features of the solution. In particular, the oblique turbulent band regime experimentally observed in the upper part of the transitional range is extremely robust. In terms of Reynolds numbers, the resolution lowering is seen to yield a regular downward shift of the upper and lower thresholds Rt and Rg where the bands appear and break down. | ||
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| + | **2010-06-09 Predrag to Ruslan**, about a possibility of applying for BBSRC US Partnering Award scheme [[http://www.bbsrc.ac.uk/science/international/usa.aspx|www.bbsrc.ac.uk/science/international/usa.aspx]], an upcoming application deadline for November 2010: | ||
| + | |||
| + | Grigoriev, Fenton, Cherry and I applied for NSF cyber-initiative, idea being that the yet-unknown postdoc would | ||
| + | work with Grigoriev, Cherry and me on finding numerically exact unstable relative equilibria (spiral waves & scrolls) | ||
| + | and relative periodic orbits in excitable media. That would be a continuation of work of Biktashev(a), Barkley, and | ||
| + | zillion others in our, turbulent direction, with hopefully leading to better diagnostic and control. So if you want to do that, | ||
| + | we are biotechnology? | ||
| **2010-01-06 Jean-Pierre Eckmann:** Y R U doing all this? | **2010-01-06 Jean-Pierre Eckmann:** Y R U doing all this? | ||
gtspring2009/predrag/blog.1265126109.txt.gz · Last modified: 2010/06/09 07:01 (external edit)
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