Wave asymmetry and particle orbits in irregular wave models
Lindgren, Georg LU
and Prevosto, Marc
(2020)
In Journal of Fluid Mechanics
905.
- Abstract
- Water particle orbits are key elements in the Lagrange wave formulation. The stochastic Miche implementation of the Lagrange model is a linear Gaussian two-dimensional or three-dimensional space–time model which exhibits typical nonlinear wave characteristics when transformed to Eulerian coordinates. This paper investigates the statistical relation between the degree of front–back asymmetry of individual waves and the orbit orientation for the particle located at the wave maximum at the point of observation. It is shown that, in the Lagrangian model with statistical front–back symmetry, for individual waves there is a clear connexion between the degree of individual wave asymmetry and the orientation of the randomly deformed elliptic... (More)
- Water particle orbits are key elements in the Lagrange wave formulation. The stochastic Miche implementation of the Lagrange model is a linear Gaussian two-dimensional or three-dimensional space–time model which exhibits typical nonlinear wave characteristics when transformed to Eulerian coordinates. This paper investigates the statistical relation between the degree of front–back asymmetry of individual waves and the orbit orientation for the particle located at the wave maximum at the point of observation. It is shown that, in the Lagrangian model with statistical front–back symmetry, for individual waves there is a clear connexion between the degree of individual wave asymmetry and the orientation of the randomly deformed elliptic orbit: a steep front correlates with upward tilt, a steep back is correlated with a downward tilt. This holds both for waves observed in time and in space, and the dependence is stronger for large amplitude waves than for smaller ones. The dependence is strongly dependent on the depth and on the significant steepness and spectral width. Inclusion of the average Stokes drift has a moderate effect on the dependence. For models with forced front–back asymmetry there is both a systematic dependence and a statistical correlation between asymmetry and tilt; for large amplitude waves the systematic relation dominates. The conclusions are based on Fourier simulations of Gauss–Lagrange waves of first and second order with a wind–sea Pierson–Moskowitz spectrum and a narrow swell JONSWAP spectrum. (Less)
- Abstract (Swedish)
- Water particle orbits are key elements in the Lagrange wave formulation. The stochastic
Miche implementation of the Lagrange model is a linear Gaussian 2D or 3D space-time
model which exhibit typical non-linear wave characteristics when transformed to Eulerian
coordinates. This paper investigates the statistical relation between the degree of front-back
asymmetry of individual waves and the orbit orientation for the particle
located at the wave maximum at the point of observation.
It is shown that in the Lagrangian model with statistical front-back symmetry, for individual waves
there is a clear connexion between the degree of individual wave asymmetry and the orientation of the randomly deformed... (More) - Water particle orbits are key elements in the Lagrange wave formulation. The stochastic
Miche implementation of the Lagrange model is a linear Gaussian 2D or 3D space-time
model which exhibit typical non-linear wave characteristics when transformed to Eulerian
coordinates. This paper investigates the statistical relation between the degree of front-back
asymmetry of individual waves and the orbit orientation for the particle
located at the wave maximum at the point of observation.
It is shown that in the Lagrangian model with statistical front-back symmetry, for individual waves
there is a clear connexion between the degree of individual wave asymmetry and the orientation of the randomly deformed elliptic orbit: a steep front correlates with upward tilt,
a steep back is correlated with a downward tilt. This holds both for waves observed in
time and in space, and the dependence is stronger for large
amplitude waves than for smaller ones.
The dependence is strongly dependent on the depth and on the significant steepness
and spectral width. Inclusion of the average Stokes drift
has a moderate effect on the dependence. For models with forced front-back asymmetry
there is both a systematic dependence and a statistical correlation between asymmetry
and tilt; for large amplitude waves the systematic relation dominates. The conclusions
are based on Fourier simulations of Gauss-Lagrange waves of 1st and 2nd order
with wind-sea Pierson-Moskowitz spectrum and a narrow swell JONSWAP spectrum. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/2d3b092f-7853-42d6-9414-a83ac482e0ba
- author
- Lindgren, Georg
LU
and Prevosto, Marc
- organization
- publishing date
- 2020-12-25
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Journal of Fluid Mechanics
- volume
- 905
- article number
- A27
- pages
- 19 pages
- publisher
- Cambridge University Press
- external identifiers
-
- scopus:85095442569
- ISSN
- 0022-1120
- DOI
- 10.1017/jfm.2020.738
- language
- English
- LU publication?
- yes
- id
- 2d3b092f-7853-42d6-9414-a83ac482e0ba
- date added to LUP
- 2020-09-02 12:18:08
- date last changed
- 2022-04-19 00:39:18
@article{2d3b092f-7853-42d6-9414-a83ac482e0ba,
abstract = {{Water particle orbits are key elements in the Lagrange wave formulation. The stochastic Miche implementation of the Lagrange model is a linear Gaussian two-dimensional or three-dimensional space–time model which exhibits typical nonlinear wave characteristics when transformed to Eulerian coordinates. This paper investigates the statistical relation between the degree of front–back asymmetry of individual waves and the orbit orientation for the particle located at the wave maximum at the point of observation. It is shown that, in the Lagrangian model with statistical front–back symmetry, for individual waves there is a clear connexion between the degree of individual wave asymmetry and the orientation of the randomly deformed elliptic orbit: a steep front correlates with upward tilt, a steep back is correlated with a downward tilt. This holds both for waves observed in time and in space, and the dependence is stronger for large amplitude waves than for smaller ones. The dependence is strongly dependent on the depth and on the significant steepness and spectral width. Inclusion of the average Stokes drift has a moderate effect on the dependence. For models with forced front–back asymmetry there is both a systematic dependence and a statistical correlation between asymmetry and tilt; for large amplitude waves the systematic relation dominates. The conclusions are based on Fourier simulations of Gauss–Lagrange waves of first and second order with a wind–sea Pierson–Moskowitz spectrum and a narrow swell JONSWAP spectrum.}},
author = {{Lindgren, Georg and Prevosto, Marc}},
issn = {{0022-1120}},
language = {{eng}},
month = {{12}},
publisher = {{Cambridge University Press}},
series = {{Journal of Fluid Mechanics}},
title = {{Wave asymmetry and particle orbits in irregular wave models}},
url = {{http://dx.doi.org/10.1017/jfm.2020.738}},
doi = {{10.1017/jfm.2020.738}},
volume = {{905}},
year = {{2020}},
}