Potential Vorticity Generation in Breaking Gravity Waves
Potential vorticity (PV) is an important quantity in stratified flows because it is conserved following the flow in the absence of forcing and viscous and diffusive effects. However, as shown by previous work for unstratified turbulence, viscosity and diffusion, when present, are not purely dissipat...
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| Format: | Article |
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MDPI AG
2023-05-01
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| Series: | Atmosphere |
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| Online Access: | https://www.mdpi.com/2073-4433/14/5/881 |
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| author | Michael L. Waite Nicholas Richardson |
| author_facet | Michael L. Waite Nicholas Richardson |
| author_sort | Michael L. Waite |
| collection | DOAJ |
| description | Potential vorticity (PV) is an important quantity in stratified flows because it is conserved following the flow in the absence of forcing and viscous and diffusive effects. However, as shown by previous work for unstratified turbulence, viscosity and diffusion, when present, are not purely dissipative and can create potential vorticity even when none is present initially. In this work, we use direct numerical simulations to investigate the viscous and diffusive generation of potential vorticity and potential enstrophy (integrated square PV) in stratified turbulence. Simulations are initialized with a two-dimensional standing internal gravity wave, which has no potential vorticity apart from some low-level random noise; as a result, all potential vorticity and enstrophy comes from viscous and diffusive effects. Significant potential enstrophy is found when the standing wave breaks, and the maximum potential enstrophy increases with increasing Reynolds number. The mechanism for the initial PV generation is spanwise diffusion of buoyancy perturbations, which grow as the standing wave three-dimensionalizes, into the direction of spanwise vorticity. The viscous and diffusive terms responsible are small-scale and are sensitive to under-resolution, so high resolution is required to obtain robust results. |
| first_indexed | 2024-03-11T03:58:11Z |
| format | Article |
| id | doaj.art-f547424fe6c9410882772936fd5b8d4d |
| institution | Directory Open Access Journal |
| issn | 2073-4433 |
| language | English |
| last_indexed | 2024-03-11T03:58:11Z |
| publishDate | 2023-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Atmosphere |
| spelling | doaj.art-f547424fe6c9410882772936fd5b8d4d2023-11-18T00:26:17ZengMDPI AGAtmosphere2073-44332023-05-0114588110.3390/atmos14050881Potential Vorticity Generation in Breaking Gravity WavesMichael L. Waite0Nicholas Richardson1Department of Applied Mathematics, University of Waterloo, Waterloo, ON N2L 3G1, CanadaDepartment of Applied Mathematics, University of Waterloo, Waterloo, ON N2L 3G1, CanadaPotential vorticity (PV) is an important quantity in stratified flows because it is conserved following the flow in the absence of forcing and viscous and diffusive effects. However, as shown by previous work for unstratified turbulence, viscosity and diffusion, when present, are not purely dissipative and can create potential vorticity even when none is present initially. In this work, we use direct numerical simulations to investigate the viscous and diffusive generation of potential vorticity and potential enstrophy (integrated square PV) in stratified turbulence. Simulations are initialized with a two-dimensional standing internal gravity wave, which has no potential vorticity apart from some low-level random noise; as a result, all potential vorticity and enstrophy comes from viscous and diffusive effects. Significant potential enstrophy is found when the standing wave breaks, and the maximum potential enstrophy increases with increasing Reynolds number. The mechanism for the initial PV generation is spanwise diffusion of buoyancy perturbations, which grow as the standing wave three-dimensionalizes, into the direction of spanwise vorticity. The viscous and diffusive terms responsible are small-scale and are sensitive to under-resolution, so high resolution is required to obtain robust results.https://www.mdpi.com/2073-4433/14/5/881stratified turbulencepotential vorticitydirect numerical simulation |
| spellingShingle | Michael L. Waite Nicholas Richardson Potential Vorticity Generation in Breaking Gravity Waves Atmosphere stratified turbulence potential vorticity direct numerical simulation |
| title | Potential Vorticity Generation in Breaking Gravity Waves |
| title_full | Potential Vorticity Generation in Breaking Gravity Waves |
| title_fullStr | Potential Vorticity Generation in Breaking Gravity Waves |
| title_full_unstemmed | Potential Vorticity Generation in Breaking Gravity Waves |
| title_short | Potential Vorticity Generation in Breaking Gravity Waves |
| title_sort | potential vorticity generation in breaking gravity waves |
| topic | stratified turbulence potential vorticity direct numerical simulation |
| url | https://www.mdpi.com/2073-4433/14/5/881 |
| work_keys_str_mv | AT michaellwaite potentialvorticitygenerationinbreakinggravitywaves AT nicholasrichardson potentialvorticitygenerationinbreakinggravitywaves |