Experimental and numerical investigation of the effect of aft deformation using wedge and step on the performance and stability of hard chine mono-hull high-speed craft and their optimization using Taguchi statistical method

Experimental and numerical investigation of the effect of aft deformation using wedge and step on the performance and stability of hard chine mono-hull high-speed craft and their optimization using Taguchi statistical method | 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 Experimental and numerical investigation of the effect of aft deformation using wedge and step on the performance and stability of hard chine mono-hull high-speed craft and their optimization using Taguchi statistical method Parviz Ghadimi, Sayyed Mahdi Sajedi, Ali Ghadimi This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-3657265/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract Speed and stability play crucial roles in the performance of high-speed crafts. In the present paper, a two-stepped model is tested in towing tank and compared with stepless and wedge-mounted models, which have previously been tested by the authors. This study is conducted to compare the stability and performance of the mentioned models in the displacement, semi-planing, and planing regimes. The length and width of these models are 2.64 meters and 0.55 meters, respectively. The measured parameters include trim, rise-up, and resistance. The whisker sprays of the models are also depicted at different speeds. the performance of stepped boats is not suitable prior to the planing regime. But wedged model can perform well in this area. One of the features of this type of model is having a chine. So far, no comparison has been made between the chined models. Further, the whisker spray edge approaches to the keel line by increasing speed in all considered models. These tests are conducted in three series at speeds of 2,4,6 and 8 m/s within the mentioned motion regimes. Based on the experimental findings, it is observed that tested models are stable in displacement and semi-displacement regimes. The bare hull which has no transverse step or wedge, is longitudinally unstable in planning regime. However, the vessels with two transverse steps exhibit longitudinal stability and have less drag than the bare-hull model in all motion regimes. On the other hand, the trim and rise-up in stepped as well as wedged vessel are less than those in the bare-hull model in all motion regimes. Meanwhile, the drag of the two-step model at high speeds is determined to be less than the other two models. Ultimately, using the Taguchi design method, different wedge-mounted and two-stepped vessels are selected to conduct numerical studies. These simulations are done via STAR-CCM + commercial code. The calculated results show that at speeds higher than 8 m/s, the resistance could be reduced by optimizing the step location. As the first step gets farther from the stern, the resistance of the vessel reduces. However, increasing the distance between the second step and the stern leads to a drag penalty for the vessel. high-speed craft longitudinal instability second transverse step wedge numerical studies experimental design method (Taguchi technique) Full Text Cite Share Download PDF Status: Posted 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-3657265","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":265203334,"identity":"a1a6768f-e01b-4a28-87ab-08aa1771d973","order_by":0,"name":"Parviz Ghadimi","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAy0lEQVRIiWNgGAWjYFACHiAyYODhh/HZiNYi2cDA2ECCFiBlcACqhSAw51978MObgm0yxsfPmD9gqLFj4JM+gF+L5Yx3yZJzDG7zmJ3JMWxgOJbMwMaXgF+LwY0zBtI8IC0HQFrYDjCw8RBwGFCL8W+QFuP+N0At/4jRcr7HDGyLgQTQFsY2IrRYzuAxswT5ReLGs8IZiX3JPAS1mPOfMb7x5s9te/7+5A0fPnyzk5PvIeQwiQQkXgIkjgho4T9AUM0oGAWjYBSMdAAAFug8r0px8okAAAAASUVORK5CYII=","orcid":"https://orcid.org/0000-0002-9315-5428","institution":"Amirkabir University of Technology Department of Maritime Engineering","correspondingAuthor":true,"prefix":"","firstName":"Parviz","middleName":"","lastName":"Ghadimi","suffix":""},{"id":265203335,"identity":"76141529-0179-41db-9855-bc993c959054","order_by":1,"name":"Sayyed Mahdi Sajedi","email":"","orcid":"","institution":"Amirkabir University of Technology Department of Maritime Engineering","correspondingAuthor":false,"prefix":"","firstName":"Sayyed","middleName":"Mahdi","lastName":"Sajedi","suffix":""},{"id":265203336,"identity":"afdcc277-3dfe-470c-b081-b5d123feddf9","order_by":2,"name":"Ali Ghadimi","email":"","orcid":"","institution":"Amirkabir University of Technology Department of Maritime Engineering","correspondingAuthor":false,"prefix":"","firstName":"Ali","middleName":"","lastName":"Ghadimi","suffix":""}],"badges":[],"createdAt":"2023-11-24 05:45:10","currentVersionCode":1,"declarations":"","doi":"10.21203/rs.3.rs-3657265/v1","doiUrl":"https://doi.org/10.21203/rs.3.rs-3657265/v1","draftVersion":[],"editorialEvents":[],"editorialNote":"","failedWorkflow":false,"files":[{"id":53344347,"identity":"c39cd6c8-80fa-4c8a-aad8-091191684c45","added_by":"auto","created_at":"2024-03-24 18:36:08","extension":"pdf","order_by":1,"title":"","display":"","copyAsset":false,"role":"manuscript-pdf","size":1097667,"visible":true,"origin":"","legend":"","description":"","filename":"ManuscriptSubmitted.pdf","url":"https://assets-eu.researchsquare.com/files/rs-3657265/v1_covered_b8306b05-7cdc-4bee-b93c-4622595b7626.pdf"}],"financialInterests":"","formattedTitle":"Experimental and numerical investigation of the effect of aft deformation using wedge and step on the performance and stability of hard chine mono-hull high-speed craft and their optimization using Taguchi statistical method","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":false,"hideJournal":true,"highlight":"","institution":"","isAcceptedByJournal":false,"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":"high-speed craft, longitudinal instability, second transverse step, wedge, numerical studies, experimental design method (Taguchi technique)","lastPublishedDoi":"10.21203/rs.3.rs-3657265/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-3657265/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003eSpeed and stability play crucial roles in the performance of high-speed crafts. In the present paper, a two-stepped model is tested in towing tank and compared with stepless and wedge-mounted models, which have previously been tested by the authors. This study is conducted to compare the stability and performance of the mentioned models in the displacement, semi-planing, and planing regimes. The length and width of these models are 2.64 meters and 0.55 meters, respectively. The measured parameters include trim, rise-up, and resistance. The whisker sprays of the models are also depicted at different speeds. the performance of stepped boats is not suitable prior to the planing regime. But wedged model can perform well in this area. One of the features of this type of model is having a chine. So far, no comparison has been made between the chined models. Further, the whisker spray edge approaches to the keel line by increasing speed in all considered models. These tests are conducted in three series at speeds of 2,4,6 and 8 m/s within the mentioned motion regimes. Based on the experimental findings, it is observed that tested models are stable in displacement and semi-displacement regimes. The bare hull which has no transverse step or wedge, is longitudinally unstable in planning regime. However, the vessels with two transverse steps exhibit longitudinal stability and have less drag than the bare-hull model in all motion regimes. On the other hand, the trim and rise-up in stepped as well as wedged vessel are less than those in the bare-hull model in all motion regimes. Meanwhile, the drag of the two-step model at high speeds is determined to be less than the other two models. Ultimately, using the Taguchi design method, different wedge-mounted and two-stepped vessels are selected to conduct numerical studies. These simulations are done via STAR-CCM\u0026thinsp;+\u0026thinsp;commercial code. The calculated results show that at speeds higher than 8 m/s, the resistance could be reduced by optimizing the step location. As the first step gets farther from the stern, the resistance of the vessel reduces. However, increasing the distance between the second step and the stern leads to a drag penalty for the vessel.\u003c/p\u003e","manuscriptTitle":"Experimental and numerical investigation of the effect of aft deformation using wedge and step on the performance and stability of hard chine mono-hull high-speed craft and their optimization using Taguchi statistical method","msid":"","msnumber":"","nonDraftVersions":[{"code":1,"date":"2024-01-08 10:25:57","doi":"10.21203/rs.3.rs-3657265/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":"45b5ec14-38aa-4ccd-bbf0-c080340d53b7","owner":[],"postedDate":"January 8th, 2024","published":true,"recentEditorialEvents":[],"rejectedJournal":[],"revision":"","amendment":"","status":"posted","subjectAreas":[],"tags":[],"updatedAt":"2024-03-24T18:27:54+00:00","versionOfRecord":[],"versionCreatedAt":"2024-01-08 10:25:57","video":"","vorDoi":"","vorDoiUrl":"","workflowStages":[]},"version":"v1","identity":"rs-3657265","journalConfig":"researchsquare"},"__N_SSP":true},"page":"/article/[identity]/[[...version]]","query":{"redirect":"/article/rs-3657265","identity":"rs-3657265","version":["v1"]},"buildId":"qtupq5eGEP_6zYnWcrvyt","isFallback":false,"isExperimentalCompile":false,"dynamicIds":[84888],"gssp":true,"scriptLoader":[]}