Hello everyone

I have attached the integral length scale definition where upper limit goes up to infinity, but in some references practically they integrate from 1 to where autocorrelation function becomes zero (and naturally negative part is not included), references like;

1- Davidson, L., 2018. Fluid mechanics, turbulent flow and turbulence modeling. Chalmers University of Technology, Goteborg, Sweden (Nov 2011).

2- Tritton, D.J., 2012. Physical fluid dynamics. Springer Science & Business Media.

which one is correct,

1 - Integrating up to where R11 goes to zero

OR

2 - Should I include negative part too?

Thanks,

Farzad

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