# Taylor microscale

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 November 17, 2012, 07:19 Taylor microscale #1 Senior Member   Mahdi Hosseinali Join Date: Apr 2009 Location: NB, Canada Posts: 271 Rep Power: 11 has anyone calculated taylor microscale in openfoam? Appreciate it if you share the code.

 November 20, 2012, 07:33 #2 Senior Member   Mahdi Hosseinali Join Date: Apr 2009 Location: NB, Canada Posts: 271 Rep Power: 11 any one has any Idea?

 November 20, 2012, 13:16 #3 Senior Member     Daniel P. Combest Join Date: Mar 2009 Location: St. Louis, USA Posts: 612 Rep Power: 22 People might be more likely to help if you provide a little more information e.g. equations; sources; what you have tried already; what type of simulation your are performing. I'm interested in the topic if you can provide more details. __________________ Dan Find me on twitter @dancombest and LinkedIn Last edited by chegdan; November 21, 2012 at 08:54. Reason: edit: this sounds better

 December 7, 2012, 06:28 #4 Senior Member   Mahdi Hosseinali Join Date: Apr 2009 Location: NB, Canada Posts: 271 Rep Power: 11 thanks for the interest chegdan, Taylor microscale is the main length scale measured in turbulent homogeneous box to determine Reynolds number since there is no physical length scale. here is a more descriptive of what it naturally is: http://en.wikipedia.org/wiki/Taylor_microscale but a formula to calculate it is presented in "turbulent flow" by Pope in page 199. Can you tell me how to put that formula in Opefoam?

 December 10, 2012, 15:50 #5 Senior Member     Daniel P. Combest Join Date: Mar 2009 Location: St. Louis, USA Posts: 612 Rep Power: 22 Looking at Pope, around the page that you suggested, I find that the longitudinal Taylor microscale can be related to the transverse Taylor microscale via where However, this formulation seems simplistic compared to the definition by pope using the longitudinal () and transverse () autocorrelation functions. If you are looking for those, then I will have to think about this some more. If you are satisfied with the second equation formulation, then I would suggest you look into the post-processing utilities as to how variables are read in at each time and used to calculate what you want e.g. Co utility. Give it a try and post back if you run into problems. anishtain4 likes this. __________________ Dan Find me on twitter @dancombest and LinkedIn

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