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How do you calculate the fluctuating pressure coefficient: by N or N-1

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Old   March 11, 2014, 02:17
Default How do you calculate the fluctuating pressure coefficient: by N or N-1
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yu. yuxuan
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Just like the topic as follows

${C_p}^\prime (\theta )= \sqrt {\frac{{\sum\limits_{t}{{{\left( {{C_p}(\theta ,t) - {{\bar C}_p}(\theta )} \right)}^2}} }}{{N - 1}}}$

or

${C_p}^\prime (\theta )= \sqrt {\frac{{\sum\limits_{t}{{{\left( {{C_p}(\theta ,t) - {{\bar C}_p}(\theta )} \right)}^2}} }}{{N }}}$

Which item will you choose? Thanks
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