Choosing the processing parameters for shear probes - Revision history

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2021-11-23T16:06:27Z

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		[[Category:Shear probes]]

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	~~== Dissipation rate estimation ==~~

	~~The following items break down the derivation of the turbulent dissipation rate of kinetic energy (<math>\varepsilon</math>).~~
	~~Explanations for each step can be found after.~~

	~~# Extract the section defined in [[Flow_chart_for_shear_probes\|step 2]].~~
	~~# High-pass filter the shear-probe and (optionally) the vibration data.~~
	~~# Identify each diss-length segment in the profile.~~
	~~# De-spike the shear-probe data, and track the fraction of data affected by de-spiking within each diss-length segment. This will become a quality-control metric.~~
	~~# Calculate the frequency spectra and cross-spectra of shear and vibrations for each diss-length segment using the method described here.~~
	~~# Extract the original and the vibration-coherent clean shear-probe frequency spectra.~~
	~~# Correct shear and vibration frequency spectra for the high-pass filter.~~
	~~# Correct the cleaned frequency spectra for the bias induced by the Goodman algorithm.~~
	# Convert the frequency spectra into wavenumber spectra using the mean speed for each diss-length segment. That is, make the wavenumber <math> \begin{equation}k=f/U\end{equation}</math> and the wavenumber [[Here\|kinetic energy spectrum]] <math> \begin{equation}E(\kappa)=UE(f)\end{equation}</math> .
	~~# Correct the spectra of shear for the wavenumber response of the shear probe.~~
	~~# Apply an iterative spectral integration algorithm to estimate the variance of shear, which is described here.~~
	~~# Calculate the rate of dissipation by multiplying the shear variance by <math> 15/2 \nu </math> where <math> \nu </math> is the temperature-dependent kinematic viscosity.~~

Aleboyer: Created page with "== Dissipation rate estimation == The following items break down the derivation of the turbulent dissipation rate of kinetic energy ( $\varepsilon$ ). Explanations..."

2021-06-25T12:41:06Z

Created page with "== Dissipation rate estimation == The following items break down the derivation of the turbulent dissipation rate of kinetic energy (<math>\varepsilon</math>). Explanations..."

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== Dissipation rate estimation ==

The following items break down the derivation of the turbulent dissipation rate of kinetic energy (<math>\varepsilon</math>).
Explanations for each step can be found after.

# Extract the section defined in [[Flow_chart_for_shear_probes|step 2]].
# High-pass filter the shear-probe and (optionally) the vibration data.
# Identify each diss-length segment in the profile.
# De-spike the shear-probe data, and track the fraction of data affected by de-spiking within each diss-length segment. This will become a quality-control metric.
# Calculate the frequency spectra and cross-spectra of shear and vibrations for each diss-length segment using the method described here.
# Extract the original and the vibration-coherent clean shear-probe frequency spectra.
# Correct shear and vibration frequency spectra for the high-pass filter.
# Correct the cleaned frequency spectra for the bias induced by the Goodman algorithm.
# Convert the frequency spectra into wavenumber spectra using the mean speed for each diss-length segment. That is, make the wavenumber <math> \begin{equation}k=f/U\end{equation}</math> and the wavenumber [[Here|kinetic energy spectrum]] <math> \begin{equation}E(\kappa)=UE(f)\end{equation}</math> .
# Correct the spectra of shear for the wavenumber response of the shear probe.
# Apply an iterative spectral integration algorithm to estimate the variance of shear, which is described here.
# Calculate the rate of dissipation by multiplying the shear variance by <math> 15/2 \nu </math> where <math> \nu </math> is the temperature-dependent kinematic viscosity.

Choosing the processing parameters for shear probes - Revision history

CynthiaBluteau: Categorization

Aleboyer: Blanked the page

Aleboyer: Created page with "== Dissipation rate estimation == The following items break down the derivation of the turbulent dissipation rate of kinetic energy (\varepsilon). Explanations..."

Aleboyer: Created page with "== Dissipation rate estimation == The following items break down the derivation of the turbulent dissipation rate of kinetic energy ( $\varepsilon$ ). Explanations..."