Kinetic energy dissipation

by Bimlesh Kumar last modified Feb 14, 2008 11:26 PM
Up to General comments

Kinetic energy dissipation

Posted by Bimlesh Kumar at February 09. 2008

Dear Sir,

How to measure kinetic rate dissipation through turbulence data obtained by Vectorino plus? If you have any literature please give me

Current state: Being created

Re: Kinetic energy dissipation

Posted by Atle Lohrmann at February 11. 2008

Two ideas:

a) Check out ExploreV.  You can access (I think) the Help section without buying the software license.

b) check one of the previous threads ---  http://www.nortek-as.com/forum/current-profilers-and-current-meters/579860345

or http://www.nortek-as.com/forum/velocimeters/30180970#498521376 --- a general search of the forum should be quite helpful.

Best regards, Atle Lohrmann

Current state: Being created

Re: Kinetic energy dissipation

Posted by Bimlesh Kumar at February 11. 2008

Dear Sir,

I have also purchased ExploreV software. If i am going to 5/3 figure and click on extract dissipation rate, each and every point it is giving some value. So i am confused which one is teh real one, or i am infact bot understanding teh concept properly. So please suggest me

Current state: Being created

Re: Kinetic energy dissipation

Posted by Atle Lohrmann at February 12. 2008

Have you checked the help section in the program?  - Atle Lohrmann

Current state: Being created

Re: Kinetic energy dissipation

Posted by Bimlesh Kumar at February 14. 2008

Dear Sir,

Explore V help gives brief description about it. There is no section detailing how it calculates and where to calculate. In fact help is not clear

Current state: Being created

Re: Kinetic energy dissipation

Posted by Atle Lohrmann at February 14. 2008

Dear  Bimlesh Kumar

The calculation of the dissipation rate in ExploreV is, as far as I know, based on the Taylor hypthesis of frozen turbulence and that you can use the mean flow to scale between frequency and wave number space.   I would recommend getting a book on turbulence so you can better understand how the dissipation rate is related to the spectrum that is displayed in ExploreV. 

Nortek is just an instrumentation company -- we are not really specialists in fluid mechanics.

Best regards, Atle Lohrmann

Current state: Being created
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