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2 point spatial correlation and energy spectra

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Old   March 26, 2014, 02:32
Default 2 point spatial correlation and energy spectra
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chandra shekhar pant
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Hi everyone,
I have a 2 d square periodic domain in which velocities are known at each grid points.
I have to determine radial correlation function variation with distance "r" , given by u(i)*u(i+r).
Also have to find out energy spectra variation with wave number. I am using qtoctave for post-processing the data..
Please tell me the detail of the calculation procedure.
THANKS
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