File:ADV fft length.png: Difference between revisions
Contours represent the log of the fft-length required to resolve the non-dimensional wavenumber [rad/m] indicated in each panel's title. The contours are plotted as a function of <math>\varepsilon</math> and speed past the sensor u. The fft-length controls the lowest frequency that is resolved by the spectra. The bottom panel (c) shows the fft-length that begins to resolve the viscous subrange i.e., the end of the inertial subrange. The middle panel shows the fft-length to resolve 1 decade'... |
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== Summary == | == Summary == | ||
Contours represent the log of the fft-length required to resolve the non-dimensional wavenumber [rad/m] indicated in each panel's title. The contours are plotted as a function of <math>\varepsilon</math> and speed past the sensor u. The fft-length controls the lowest frequency that is resolved by the spectra. | Contours represent the log of the fft-length required to resolve the non-dimensional wavenumber [rad/m] indicated in each panel's title. The contours are plotted as a function of <math>\varepsilon</math> and speed past the sensor u. The fft-length controls the lowest frequency that is resolved by the spectra. Panel (a) provides a bit of breathing room for fitting the inertial subrange given the sparse number of spectral observations at low wavenumber. The middle panel (b) shows the fft-length to resolve 1 decade's worth of inertial subrange. The bottom panel (c) shows the fft-length that begins to resolve the viscous subrange i.e., the end of the inertial subrange. It can be used to gauge the fft-length for computing shear probe spectra to estimate <math>\varepsilon</math> from the viscous subrange. | ||
Latest revision as of 21:02, 10 July 2022
Summary
Contours represent the log of the fft-length required to resolve the non-dimensional wavenumber [rad/m] indicated in each panel's title. The contours are plotted as a function of [math]\displaystyle{ \varepsilon }[/math] and speed past the sensor u. The fft-length controls the lowest frequency that is resolved by the spectra. Panel (a) provides a bit of breathing room for fitting the inertial subrange given the sparse number of spectral observations at low wavenumber. The middle panel (b) shows the fft-length to resolve 1 decade's worth of inertial subrange. The bottom panel (c) shows the fft-length that begins to resolve the viscous subrange i.e., the end of the inertial subrange. It can be used to gauge the fft-length for computing shear probe spectra to estimate [math]\displaystyle{ \varepsilon }[/math] from the viscous subrange.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 20:59, 10 July 2022 |  | 800 × 800 (166 KB) | CynthiaBluteau (talk | contribs) | Contours represent the log of the fft-length required to resolve the non-dimensional wavenumber [rad/m] indicated in each panel's title. The contours are plotted as a function of <math>\varepsilon</math> and speed past the sensor u. The fft-length controls the lowest frequency that is resolved by the spectra. The bottom panel (c) shows the fft-length that begins to resolve the viscous subrange i.e., the end of the inertial subrange. The middle panel shows the fft-length to resolve 1 decade'... |
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