Show simple item record

dc.contributor.authorLøken, Trygve K.
dc.contributor.authorLande-Sudall, David
dc.contributor.authorJensen, Atle
dc.contributor.authorRabault, Jean
dc.date.accessioned2024-04-05T13:00:16Z
dc.date.available2024-04-05T13:00:16Z
dc.date.created2024-03-28T09:46:08Z
dc.date.issued2024
dc.identifier.citationLøken, T. K., Lande-Sudall, D., Jensen, A. & Rabault, J. (2024). Grid turbulence measurements with an acoustic Doppler current profiler. Fluids, 9(3): 60. doi:en_US
dc.identifier.issn2311-5521
dc.identifier.urihttps://hdl.handle.net/11250/3125131
dc.description.abstractThe motivation for this study is to investigate the abilities and limitations of a Nortek Signature1000 acoustic Doppler current profiler (ADCP) regarding fine-scale turbulence measurements. Current profilers offer the advantage of gaining more coherent measurement data than available with point acoustic measurements, and it is desirable to exploit this property in laboratory and field applications. The ADCP was tested in a towing tank, where turbulence was generated from a grid towed under controlled conditions. Grid-induced turbulence is a well-studied phenomenon and a good approximation for isotropic turbulence. Several previous experiments are available for comparison and there are developed theories within the topic. In the present experiments, a Nortek Vectrino acoustic Doppler velocimeter (ADV), which is an established instrument for turbulence measurements, was applied to validate the ADCP. It was found that the mean flow measured with the ADCP was accurate within 4% of the ADV. The turbulent variance was reasonably well resolved by the ADCP when large grid bars were towed at a high speed, but largely overestimated for lower towing speed and smaller grid bars. The effective cutoff frequency and turbulent eddy size were characterized experimentally, which provides detailed guidelines for when the ADCP data can be trusted and will allow future experimentalists to decide a priori if the Nortek Signature can be used in their setup. We conclude that the ADCP is not suitable for resolving turbulent spectra in a small-scale grid-induced flow due to the intrinsic Doppler noise and the low spatial and temporal sample resolution relative to the turbulent scales.en_US
dc.language.isoengen_US
dc.publisherMDPIen_US
dc.rightsNavngivelse 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/deed.no*
dc.subjectTurbulensen_US
dc.subjectTurbulenceen_US
dc.titleGrid turbulence measurements with an acoustic Doppler current profileren_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.description.versionpublishedVersionen_US
dc.rights.holder© 2024 The Author(s)en_US
dc.subject.nsiVDP::Mekaniske og strømningstekniske fag: 574en_US
dc.subject.nsiVDP::Mechanical and flow technical subjects: 574en_US
dc.subject.nsiVDP::Mekaniske og strømningstekniske fag: 574en_US
dc.subject.nsiVDP::Mechanical and flow technical subjects: 574en_US
dc.source.pagenumber14en_US
dc.source.volume9en_US
dc.source.journalFluidsen_US
dc.source.issue3en_US
dc.identifier.doi10.3390/fluids9030060
dc.identifier.cristin2257554
dc.relation.projectThe Research Council of Norway: 280625en_US
dc.source.articlenumber60en_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record

Navngivelse 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Navngivelse 4.0 Internasjonal