On the Effects of Anisotropy on the Flocculation of Cohesive Particles in Turbulence

On the Effects of Anisotropy on the Flocculation of Cohesive Particles in Turbulence | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article On the Effects of Anisotropy on the Flocculation of Cohesive Particles in Turbulence Alexandre Leonelli, Eckart Meiburg This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-7676015/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 17 Nov, 2025 Read the published version in Acta Mechanica → Version 1 posted You are reading this latest preprint version Abstract Particle-resolved direct numerical simulations of finite-sized cohesive particles suspended in a turbulent channel flow are performed to study the effects of an anisotropic flow field on the aggregation, breakup, and restructuring of cohesive particles, known as flocculation. The strength of the cohesive force, and the density ratio between particle and fluid are varied. Consistent with findings in simplified cellular flows \cite{zhao_efficient_2020} and homogeneous isotropic turbulence \cite{zhao_HIT_2021}, the evolution of floc morphology through an initial aggregation-dominated transient is well modeled by an exponential. The flocculation rate and amplitude of relaxation of the floc morphology metrics, averaged over all flocs, are found to follow power law relations with $St$ and $Co$. The channel is binned and a similar analysis performed on the time evolution of locally-binned average floc sizes. Doing so reveals the dependence on the wall-normal direction of the flocculation rate and relaxation amplitude. Scaling the local flocculation parameters with their bulk values results in a collapse, suggesting that $St$ and $Co$ globally modify the flocculation dynamics. Finally, the flocculation rate associated with the exponential rate of decay is found to correlate directly with the wall-normal profile of mean shear. cohesion turbulence anisotropy timescale Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Published Journal Publication published 17 Nov, 2025 Read the published version in Acta Mechanica → Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-7676015","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":527119959,"identity":"eff952e4-6401-418d-b202-2c4aa3a62e16","order_by":0,"name":"Alexandre 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Turbulence","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":false,"hideJournal":true,"highlight":"","institution":"","isAcceptedByJournal":true,"isAuthorSuppliedPdf":true,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":true,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"researchsquare","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":true,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"/submission","title":"Research Square","twitterHandle":"researchsquare","acdcEnabled":true,"dfaEnabled":false,"editorialSystem":"","reportingPortfolio":"","inReviewEnabled":false,"inReviewRevisionsEnabled":true},"keywords":"cohesion, turbulence, anisotropy, timescale","lastPublishedDoi":"10.21203/rs.3.rs-7676015/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-7676015/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"Particle-resolved direct numerical simulations of finite-sized cohesive particles suspended in a turbulent channel flow are performed to study the effects of an anisotropic flow field on the aggregation, breakup, and restructuring of cohesive particles, known as flocculation. The strength of the cohesive force, and the density ratio between particle and fluid are varied. Consistent with findings in simplified cellular flows \\cite{zhao_efficient_2020} and homogeneous isotropic turbulence \\cite{zhao_HIT_2021}, the evolution of floc morphology through an initial aggregation-dominated transient is well modeled by an exponential. The flocculation rate and amplitude of relaxation of the floc morphology metrics, averaged over all flocs, are found to follow power law relations with $St$ and $Co$. The channel is binned and a similar analysis performed on the time evolution of locally-binned average floc sizes. Doing so reveals the dependence on the wall-normal direction of the flocculation rate and relaxation amplitude. Scaling the local flocculation parameters with their bulk values results in a collapse, suggesting that $St$ and $Co$ globally modify the flocculation dynamics. Finally, the flocculation rate associated with the exponential rate of decay is found to correlate directly with the wall-normal profile of mean shear.","manuscriptTitle":"On the Effects of Anisotropy on the Flocculation of Cohesive Particles in Turbulence","msid":"","msnumber":"","nonDraftVersions":[{"code":1,"date":"2025-10-10 03:58:41","doi":"10.21203/rs.3.rs-7676015/v1","editorialEvents":[{"type":"communityComments","content":0}],"status":"published","journal":{"display":true,"email":"[email protected]","identity":"researchsquare","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":true,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"/submission","title":"Research Square","twitterHandle":"researchsquare","acdcEnabled":true,"dfaEnabled":false,"editorialSystem":"","reportingPortfolio":"","inReviewEnabled":false,"inReviewRevisionsEnabled":true}}],"origin":"","ownerIdentity":"0d1fe4b9-a163-4d41-9e4d-21bff42890b2","owner":[],"postedDate":"October 10th, 2025","published":true,"recentEditorialEvents":[],"rejectedJournal":[],"revision":"","amendment":"","status":"posted","subjectAreas":[],"tags":[],"updatedAt":"2025-11-24T16:08:52+00:00","versionOfRecord":{"articleIdentity":"rs-7676015","link":"https://doi.org/10.1007/s00707-025-04579-0","journal":{"identity":"acta-mechanica","isVorOnly":false,"title":"Acta Mechanica"},"publishedOn":"2025-11-17 15:57:21","publishedOnDateReadable":"November 17th, 2025"},"versionCreatedAt":"2025-10-10 03:58:41","video":"","vorDoi":"10.1007/s00707-025-04579-0","vorDoiUrl":"https://doi.org/10.1007/s00707-025-04579-0","workflowStages":[]},"version":"v1","identity":"rs-7676015","journalConfig":"researchsquare"},"__N_SSP":true},"page":"/article/[identity]/[[...version]]","query":{"redirect":"/article/rs-7676015","identity":"rs-7676015","version":["v1"]},"buildId":"8U1c8b4HqxoKbykW_rLl7","isFallback":false,"isExperimentalCompile":false,"dynamicIds":[84888],"gssp":true,"scriptLoader":[]}