Rotation of the velocity measurements - Revision history

CynthiaBluteau at 18:54, 5 July 2022

2022-07-05T18:54:18Z

← Older revision		Revision as of 18:54, 5 July 2022
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	= Methods used for rotating into the analysis frame of reference=		= Methods used for rotating into the analysis frame of reference=


	~~{{FontColor\|fg=white\|bg=red\|text=We will update when our final recommendation is set in stone. Also, comment about large vertical velocities on sloped bottoms... The page is too wordy}}~~
	* Using time-averaged velocities in each segment		* Using time-averaged velocities in each segment
	* Principal component analysis		* Principal component analysis
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	==Recommendations==		==Recommendations==
			{{FontColor\|fg=white\|bg=red\|text=We will update when our final recommendation is set in stone. Also, comment about large vertical velocities on sloped bottoms... The page is too wordy}}

	If one intends on using only the vertical velocity component to estimate <math>\varepsilon</math>, then the rotation of the velocity measurements into a new frame of reference may be skipped. The analysis frame of reference is thus the same as the measurement frame provided one direction is aligned with gravity.		If one intends on using only the vertical velocity component to estimate <math>\varepsilon</math>, then the rotation of the velocity measurements into a new frame of reference may be skipped. The analysis frame of reference is thus the same as the measurement frame provided one direction is aligned with gravity.

	~~However, [[Velocity inertial subrange model#anisotropy\|anisotropic velocity spectra]] caused when the largest turbulence scales are less than~~ {{FontColor\|fg=white\|bg=red\|text=XX}} times the Kolmogorov length scale, may inhibit using the vertical velocity component to derive <math>\varepsilon</math>. In these situations, it may be possible to use the longitudinal velocity component (see Bluteau et al (2011)<ref name="Bluteau.etal2011"/>), which requires the user to rotate the velocity in the direction of the mean flow.		{{FontColor\|fg=white\|bg=red\|text=If not, then which strategy is best ? I think all are OK}}
	==References==		==References==
	<references />		<references />

CynthiaBluteau: /* Methods used for rotating into the analysis frame of reference */

2022-07-05T18:50:25Z

Methods used for rotating into the analysis frame of reference

← Older revision		Revision as of 18:50, 5 July 2022
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	= Methods used for rotating into the analysis frame of reference=		= Methods used for rotating into the analysis frame of reference=
	If one intends on using only the vertical velocity component to estimate <math>\varepsilon</math>, then the rotation of the velocity measurements into a new frame of reference may be skipped. The analysis frame of reference is thus the same as the measurement frame provided one direction is aligned with gravity.

	However, [[Velocity inertial subrange model#anisotropy\|anisotropic velocity spectra]] caused when the largest turbulence scales are less than {{FontColor\|fg=white\|bg=red\|text=XX}} times the Kolmogorov length scale, may inhibit using the vertical velocity component to derive <math>\varepsilon</math>. In these situations, it may be possible to use the longitudinal velocity component (see Bluteau et al (2011)<ref name="Bluteau.etal2011"/>), which requires the user to rotate the velocity in the direction of the mean flow.

	{{FontColor\|fg=white\|bg=red\|text=We will update when our final recommendation is set in stone. Also, comment about large vertical velocities on sloped bottoms... The page is too wordy}}		{{FontColor\|fg=white\|bg=red\|text=We will update when our final recommendation is set in stone. Also, comment about large vertical velocities on sloped bottoms... The page is too wordy}}
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	* Principal component analysis		* Principal component analysis


			==Recommendations==
			If one intends on using only the vertical velocity component to estimate <math>\varepsilon</math>, then the rotation of the velocity measurements into a new frame of reference may be skipped. The analysis frame of reference is thus the same as the measurement frame provided one direction is aligned with gravity.

			However, [[Velocity inertial subrange model#anisotropy\|anisotropic velocity spectra]] caused when the largest turbulence scales are less than {{FontColor\|fg=white\|bg=red\|text=XX}} times the Kolmogorov length scale, may inhibit using the vertical velocity component to derive <math>\varepsilon</math>. In these situations, it may be possible to use the longitudinal velocity component (see Bluteau et al (2011)<ref name="Bluteau.etal2011"/>), which requires the user to rotate the velocity in the direction of the mean flow.
	==References==		==References==
	<references />		<references />

CynthiaBluteau: /* Methods used for rotating into the analysis frame of reference */

2022-07-05T18:47:59Z

Methods used for rotating into the analysis frame of reference

← Older revision		Revision as of 18:47, 5 July 2022
Line 18:		Line 18:

	= Methods used for rotating into the analysis frame of reference=		= Methods used for rotating into the analysis frame of reference=
	If one intends on using only the vertical velocity component to estimate <math>\varepsilon</math>, then the rotation of the velocity measurements into a new frame of reference may be skipped. The analysis frame of reference is thus the same as the measurement frame provided one direction is aligned with gravity. However, [[Velocity inertial subrange model#anisotropy\|anisotropic velocity spectra]] caused when the largest turbulence scales are less than {{FontColor\|fg=white\|bg=red\|text=XX}} times the Kolmogorov length scale, may inhibit using the vertical velocity component to derive <math>\varepsilon</math>. In these situations, it may be possible to use the longitudinal velocity component (see Bluteau et al (2011)<ref name="Bluteau.etal2011"/>), which requires the user to rotate the velocity in the direction of mean flow.		If one intends on using only the vertical velocity component to estimate <math>\varepsilon</math>, then the rotation of the velocity measurements into a new frame of reference may be skipped. The analysis frame of reference is thus the same as the measurement frame provided one direction is aligned with gravity.

			However, [[Velocity inertial subrange model#anisotropy\|anisotropic velocity spectra]] caused when the largest turbulence scales are less than {{FontColor\|fg=white\|bg=red\|text=XX}} times the Kolmogorov length scale, may inhibit using the vertical velocity component to derive <math>\varepsilon</math>. In these situations, it may be possible to use the longitudinal velocity component (see Bluteau et al (2011)<ref name="Bluteau.etal2011"/>), which requires the user to rotate the velocity in the direction of the mean flow.

	{{FontColor\|fg=white\|bg=red\|text=We will update when our final recommendation is set in stone. Also, comment about large vertical velocities on sloped bottoms... The page is too wordy}}		{{FontColor\|fg=white\|bg=red\|text=We will update when our final recommendation is set in stone. Also, comment about large vertical velocities on sloped bottoms... The page is too wordy}}

CynthiaBluteau at 18:47, 5 July 2022

2022-07-05T18:47:32Z

← Older revision		Revision as of 18:47, 5 July 2022
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	\|doi=10:4319/lom.2011.9.302		\|doi=10:4319/lom.2011.9.302
	}}</ref>. If this isn't the case, then the velocities' measurement frame must be rotated into that of the flow, which we refer to as the analysis frame of reference.		}}</ref>. If this isn't the case, then the velocities' measurement frame must be rotated into that of the flow, which we refer to as the analysis frame of reference.



	= Methods used for rotating into the analysis frame of reference=		= Methods used for rotating into the analysis frame of reference=

CynthiaBluteau at 18:47, 5 July 2022

2022-07-05T18:47:19Z

← Older revision		Revision as of 18:47, 5 July 2022
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	\|level=level 2 segmented and quality controlled		\|level=level 2 segmented and quality controlled
	}}		}}
	To estimate <math>\varepsilon</math> from all the different velocity components, the measurements must be rotated into the main direction of the flow.		To estimate <math>\varepsilon</math> from all the different velocity components, the measurements must be rotated into the main direction of the flow. In some instances, the instrument's [[frame of reference]] may be aligned with the direction of flow, which is ideal to account for the varying levels of [[Velocity inertial subrange model#anisotropy\|anisotropy]] amongst components <ref name="Gargett.etal1984">{{Cite journal

	In some instances, the instrument's [[frame of reference]] may be aligned with the direction of flow, which is ideal to account for the varying levels of [[Velocity inertial subrange model#anisotropy\|anisotropy]] amongst components <ref name="Gargett.etal1984">{{Cite journal
	\|authors= A. E. Gargett, T. R. Osborn, and P.W. Nasmyth		\|authors= A. E. Gargett, T. R. Osborn, and P.W. Nasmyth
	\|journal_or_publisher= J. Fluid. Mech.		\|journal_or_publisher= J. Fluid. Mech.
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	\|year= 2011		\|year= 2011
	\|doi=10:4319/lom.2011.9.302		\|doi=10:4319/lom.2011.9.302
	}}</ref>. If this isn't the case, then the ~~velocitie~~'s measurement frame must be rotated into that of the flow.		}}</ref>. If this isn't the case, then the velocities' measurement frame must be rotated into that of the flow, which we refer to as the analysis frame of reference.



	= Methods used for rotating into the analysis frame of reference=		= Methods used for rotating into the analysis frame of reference=
	If one intends on using only the vertical velocity component to estimate <math>\varepsilon</math>, then the rotation of the velocity measurements into a new frame of reference may be skipped. However, [[Velocity inertial subrange model#anisotropy\|anisotropic velocity spectra]] caused when the largest turbulence scales are less than {{FontColor\|fg=white\|bg=red\|text=XX}} times the Kolmogorov length scale, may inhibit using the vertical velocity component to derive <math>\varepsilon</math>. In these situations, it may be possible to use the longitudinal velocity component (see Bluteau et al (2011)<ref name="Bluteau.etal2011"/>), which requires the user to rotate the velocity in the direction of mean flow.		If one intends on using only the vertical velocity component to estimate <math>\varepsilon</math>, then the rotation of the velocity measurements into a new frame of reference may be skipped. The analysis frame of reference is thus the same as the measurement frame provided one direction is aligned with gravity. However, [[Velocity inertial subrange model#anisotropy\|anisotropic velocity spectra]] caused when the largest turbulence scales are less than {{FontColor\|fg=white\|bg=red\|text=XX}} times the Kolmogorov length scale, may inhibit using the vertical velocity component to derive <math>\varepsilon</math>. In these situations, it may be possible to use the longitudinal velocity component (see Bluteau et al (2011)<ref name="Bluteau.etal2011"/>), which requires the user to rotate the velocity in the direction of mean flow.

	{{FontColor\|fg=white\|bg=red\|text=We will update when our final recommendation is set in stone. Also, comment about large vertical velocities on sloped bottoms... The page is too wordy}}		{{FontColor\|fg=white\|bg=red\|text=We will update when our final recommendation is set in stone. Also, comment about large vertical velocities on sloped bottoms... The page is too wordy}}

CynthiaBluteau at 18:45, 5 July 2022

2022-07-05T18:45:13Z

← Older revision		Revision as of 18:45, 5 July 2022
Line 3:		Line 3:
	\|level=level 2 segmented and quality controlled		\|level=level 2 segmented and quality controlled
	}}		}}
			To estimate <math>\varepsilon</math> from all the different velocity components, the measurements must be rotated into the main direction of the flow.

	~~The~~ [[~~frame of reference\|measurement~~ frame of reference]] ~~varies between set-ups. In some instances, the instrument has an axis~~ aligned with the direction of flow, which is ideal to account for the varying levels of anisotropy amongst components <ref name="Gargett.etal1984">{{Cite journal		In some instances, the instrument's [[frame of reference]] may be aligned with the direction of flow, which is ideal to account for the varying levels of [[Velocity inertial subrange model#anisotropy\|anisotropy]] amongst components <ref name="Gargett.etal1984">{{Cite journal
	\|authors= A. E. Gargett, T. R. Osborn, and P.W. Nasmyth		\|authors= A. E. Gargett, T. R. Osborn, and P.W. Nasmyth
	\|journal_or_publisher= J. Fluid. Mech.		\|journal_or_publisher= J. Fluid. Mech.
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	\|year= 2011		\|year= 2011
	\|doi=10:4319/lom.2011.9.302		\|doi=10:4319/lom.2011.9.302
	}}</ref>. ~~Still, it~~'~~s possible to rotate the measurements into~~ the main component of the flow if intending on making use of the different components when estimating <math>\varepsilon</math> or other turbulence quantities (e.g., Reynold stresses). If one intends on using only the vertical velocity component to estimate <math>\varepsilon</math>, then ~~this step of rotating~~ the ~~velocity measurements may~~ be ~~skipped. However, anisotropic [[Velocity inertial subrange model#anisotropy\| velocity spectra]] caused when~~ the largest turbulence scales are less than {{FontColor\|fg=white\|bg=red\|text=XX}} times the Kolmogorov length scale, may inhibit using the vertical velocity component to derive <math>\varepsilon</math>. In these situations, it may be possible to use the longitudinal velocity component (see Bluteau et al (2011)<ref name="Bluteau.etal2011"/>), which requires the user to rotate the velocity in the direction of mean flow.		}}</ref>. If this isn't the case, then the velocitie's measurement frame must be rotated into that of the flow.



	= Methods used for rotating into the analysis frame of reference=		= Methods used for rotating into the analysis frame of reference=
	{{FontColor\|fg=white\|bg=red\|text=We will update when our final recommendation is set in stone. Also, comment about large vertical velocities on sloped bottoms...}}		If one intends on using only the vertical velocity component to estimate <math>\varepsilon</math>, then the rotation of the velocity measurements into a new frame of reference may be skipped. However, [[Velocity inertial subrange model#anisotropy\|anisotropic velocity spectra]] caused when the largest turbulence scales are less than {{FontColor\|fg=white\|bg=red\|text=XX}} times the Kolmogorov length scale, may inhibit using the vertical velocity component to derive <math>\varepsilon</math>. In these situations, it may be possible to use the longitudinal velocity component (see Bluteau et al (2011)<ref name="Bluteau.etal2011"/>), which requires the user to rotate the velocity in the direction of mean flow.

			{{FontColor\|fg=white\|bg=red\|text=We will update when our final recommendation is set in stone. Also, comment about large vertical velocities on sloped bottoms... The page is too wordy}}
	* Using time-averaged velocities in each segment		* Using time-averaged velocities in each segment
	* Principal component analysis		* Principal component analysis

CynthiaBluteau at 18:38, 5 July 2022

2022-07-05T18:38:50Z

← Older revision		Revision as of 18:38, 5 July 2022
Line 16:		Line 16:
	\|year= 2011		\|year= 2011
	\|doi=10:4319/lom.2011.9.302		\|doi=10:4319/lom.2011.9.302
	}}</ref>. Still, it's possible to rotate the measurements into the main component of the flow if intending on making use of the different components when estimating <math>\varepsilon</math> or other turbulence quantities (e.g., Reynold stresses). If one intends on using only the vertical velocity component to estimate <math>\varepsilon</math>, then this step of rotating the velocity measurements may be skipped. However, anisotropic [[Velocity inertial subrange model#anisotropy\| velocity spectra]] caused when the largest turbulence scales are less than {{FontColor\|fg=white\|bg=red\|text=XX}} times the Kolmogorov length scale, may inhibit using the vertical velocity component to derive <math>\varepsilon</math>. In these situations, it may be possible to use the longitudinal velocity component~~. The L&O methods paper by~~ Bluteau et al (2011)<ref name="Bluteau.etal2011"/>, ~~discusses this topic~~ in ~~greater detail~~.		}}</ref>. Still, it's possible to rotate the measurements into the main component of the flow if intending on making use of the different components when estimating <math>\varepsilon</math> or other turbulence quantities (e.g., Reynold stresses). If one intends on using only the vertical velocity component to estimate <math>\varepsilon</math>, then this step of rotating the velocity measurements may be skipped. However, anisotropic [[Velocity inertial subrange model#anisotropy\| velocity spectra]] caused when the largest turbulence scales are less than {{FontColor\|fg=white\|bg=red\|text=XX}} times the Kolmogorov length scale, may inhibit using the vertical velocity component to derive <math>\varepsilon</math>. In these situations, it may be possible to use the longitudinal velocity component (see Bluteau et al (2011)<ref name="Bluteau.etal2011"/>), which requires the user to rotate the velocity in the direction of mean flow.

	= Methods used for rotating into the analysis frame of reference=		= Methods used for rotating into the analysis frame of reference=

CynthiaBluteau at 18:37, 5 July 2022

2022-07-05T18:37:45Z

← Older revision		Revision as of 18:37, 5 July 2022
Line 16:		Line 16:
	\|year= 2011		\|year= 2011
	\|doi=10:4319/lom.2011.9.302		\|doi=10:4319/lom.2011.9.302
	}}</ref>. Still, it's possible to rotate the measurements into the main component of the flow if intending on making use of the different components when estimating <math>\varepsilon</math> or other turbulence quantities (e.g., Reynold stresses). If one intends on using only the vertical velocity component to estimate <math>\varepsilon</math>, then this step of rotating the velocity measurements may be skipped. {{FontColor\|fg=white\|bg=red\|text=~~Mention anisotropy~~, ~~and refer~~ to ~~my own~~ paper}}		}}</ref>. Still, it's possible to rotate the measurements into the main component of the flow if intending on making use of the different components when estimating <math>\varepsilon</math> or other turbulence quantities (e.g., Reynold stresses). If one intends on using only the vertical velocity component to estimate <math>\varepsilon</math>, then this step of rotating the velocity measurements may be skipped. However, anisotropic [[Velocity inertial subrange model#anisotropy\| velocity spectra]] caused when the largest turbulence scales are less than {{FontColor\|fg=white\|bg=red\|text=XX}} times the Kolmogorov length scale, may inhibit using the vertical velocity component to derive <math>\varepsilon</math>. In these situations, it may be possible to use the longitudinal velocity component. The L&O methods paper by Bluteau et al (2011)<ref name="Bluteau.etal2011"/>, discusses this topic in greater detail.

	= Methods used for rotating into the analysis frame of reference=		= Methods used for rotating into the analysis frame of reference=

CynthiaBluteau at 13:41, 5 July 2022

2022-07-05T13:41:50Z

← Older revision		Revision as of 13:41, 5 July 2022
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	\|year= 1984		\|year= 1984
	\|doi=10.1017/S0022112084001592		\|doi=10.1017/S0022112084001592
			}}</ref><ref name="Bluteau.etal2011">{{Cite journal
			\|authors= C.E. Bluteau, N.L. Jones, and G. Ivey
			\|journal_or_publisher= Limnol. Oceanogr.: Methods
			\|paper_or_booktitle= Estimating turbulent kinetic energy dissipation using the inertial subrange method in environmental flows
			\|year= 2011
			\|doi=10:4319/lom.2011.9.302
	}}</ref>. Still, it's possible to rotate the measurements into the main component of the flow if intending on making use of the different components when estimating <math>\varepsilon</math> or other turbulence quantities (e.g., Reynold stresses). If one intends on using only the vertical velocity component to estimate <math>\varepsilon</math>, then this step of rotating the velocity measurements may be skipped. {{FontColor\|fg=white\|bg=red\|text=Mention anisotropy, and refer to my own paper}}		}}</ref>. Still, it's possible to rotate the measurements into the main component of the flow if intending on making use of the different components when estimating <math>\varepsilon</math> or other turbulence quantities (e.g., Reynold stresses). If one intends on using only the vertical velocity component to estimate <math>\varepsilon</math>, then this step of rotating the velocity measurements may be skipped. {{FontColor\|fg=white\|bg=red\|text=Mention anisotropy, and refer to my own paper}}

CynthiaBluteau at 13:28, 5 July 2022

2022-07-05T13:28:25Z

← Older revision		Revision as of 13:28, 5 July 2022
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	}}		}}

	The [[frame of reference\|measurement frame of reference]] varies between set-ups. In some instances, the instrument has an axis aligned with the direction of flow, which is ideal to account for the varying levels of anisotropy amongst components <ref name="~~luecketal2022~~">{{Cite journal		The [[frame of reference\|measurement frame of reference]] varies between set-ups. In some instances, the instrument has an axis aligned with the direction of flow, which is ideal to account for the varying levels of anisotropy amongst components <ref name="Gargett.etal1984">{{Cite journal
	\|authors= A. E. Gargett, T. R. Osborn, and P.W. Nasmyth		\|authors= A. E. Gargett, T. R. Osborn, and P.W. Nasmyth
	\|journal_or_publisher= J. Fluid. Mech.		\|journal_or_publisher= J. Fluid. Mech.