Experimental validation of a CFD-based resistive force coefficient set for rotating helical tails in cylindrical Channels

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dc.contributor.authorTabak, Ahmet Fatih
dc.contributor.authorYeşilyurt, Serhat
dc.date.accessioned2020-11-21T15:54:12Z
dc.date.available2020-11-21T15:54:12Z
dc.date.issued2013en_US
dc.departmentİstanbul Ticaret Üniversitesien_US
dc.description7th Subrata Chakrabarti International Conference on Fluid Structure Interaction, FSI 2013 -- 10 April 2013 through 12 April 2013 -- Gran Canaria -- 97103en_US
dc.description.abstractReal-time manipulation of objects in micro flows is important due to an ever increasing interest in demanding medical applications. Specialized swimming micro robots are expected to perform minimal invasive surgery consisting of various in vivo tasks. Moreover, fluid forces exerted on moving surfaces are crucial for maneuverability if swimming micro robotic tools are ever to play a key role in therapeutic applications. Hydrodynamic forces acting on an isolated object of regular blunt shapes immersed in micro flows are calculated by resistive force coefficients based on the Stokes Flow approximation derived by analytical means. However, force coefficients presented in literature often lack the accuracy to predict the hydrodynamic interactions between rotating and translating objects of irregular shapes, and rigid concave surfaces such as a rigid helix moving inside a cylindrical channel. In this study a set of parameterized 3D CFD simulations are carried out using a novel geometric representation for rigid helical tails of varying sizes and of varying distances with respect to the wall of a cylindrical channel. Furthermore, the complex rigid-body motion of the helix is represented by a series of simple translations and rotations. Each simulation is governed by Stokes equations and carried out by a commercial CFD package. A generic resistive force coefficient set is obtained via surface-fit procedures based on the hydrodynamic forces computed by the CFD simulations along the tangential, normal and binormal directions on the moving and rotating helical surface. Finally, using a reduced-order microhydrodynamic model, the proposed coefficient set is validated with empirical data collated using bio-inspired cmscale robots autonomously swimming in a cylindrical channel filled with silicone oil of high viscosity. The robots are on-board powered and propel themselves with rotating rigid helices of parameterized geometric features. The CFD-based coefficient set predicted the experiment-based velocities of the bio-inspired untethered robots with good agreement. © 2013 WIT Press.en_US
dc.identifier.doi10.2495/FSI130181en_US
dc.identifier.endpage213en_US
dc.identifier.issn1743-3509
dc.identifier.issn9.78185E+12
dc.identifier.scopus2-s2.0-84878158158en_US
dc.identifier.scopusqualityQ2en_US
dc.identifier.startpage201en_US
dc.identifier.urihttps://doi.org/10.2495/FSI130181
dc.identifier.urihttps://hdl.handle.net/11467/3785
dc.identifier.volume129en_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.relation.ispartofWIT Transactions on the Built Environmenten_US
dc.relation.publicationcategoryKonferans Öğesi - Uluslararası - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectBio-inspired robotsen_US
dc.subjectCFD analysisen_US
dc.subjectCylindrical channelsen_US
dc.subjectLow reynolds number flowsen_US
dc.subjectReduced-order modelsen_US
dc.subjectResistive force coefficientsen_US
dc.subjectUntethered swimmingen_US
dc.titleExperimental validation of a CFD-based resistive force coefficient set for rotating helical tails in cylindrical Channelsen_US
dc.typeConference Objecten_US

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