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dc.contributor.authorNadaf, Elias de Castro-
dc.contributor.authorRadko, Timourpt_BR
dc.date.accessioned2024-01-22T18:04:01Z-
dc.date.available2024-01-22T18:04:01Z-
dc.date.issued2022-
dc.identifier.urihttps://www.repositorio.mar.mil.br/handle/ripcmb/846585-
dc.descriptionThis study explores the behavior of turbulent wakes generated by a sphere propagating with constant speed in a non-uniformly stratified fluid. The investigation is based on a series of high-resolution direct numerical simulations in which the background stratification is systematically varied. We consider one linear and three nonlinear density profiles and discover that even modest, spatially localized nonuniformities of stratification can profoundly influence the wake dynamics, structure, and evolution. The analysis of microstructure signatures shows that wakes in non-uniformly stratified fluids tend to be more spread horizontally, and internal waves are much stronger than in linear stratification. Simulations performed with Gaussian perturbations are characterized by a vertically asymmetric energy distribution, which is attributed to internal wave reflections from low-gradient regions. Using microstructure decay rates, we estimate the effective persistence period of wakes, showing that it substantially increases with the increasing Froude number. We also find that wakes persist much longer in high-gradient profiles, whereas weak local gradients can substantially reduce the wake longevity.pt_BR
dc.language.isoenpt_BR
dc.publisherPhysics of Fluidspt_BR
dc.rightsopenAccesspt_BR
dc.subjectTurbulent wakespt_BR
dc.subjectDetectionpt_BR
dc.subjectInternal wavespt_BR
dc.titleTurbulent wakes in a non-uniformly stratified environmentpt_BR
dc.typejournalArticlept_BR
dc.subject.dgpmOceanografia físicapt_BR
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