Fundamental mode of freely decaying laminar swirling flows
2016 (English)In: Applied Mathematical Modelling, ISSN 0307-904X, E-ISSN 1872-8480, Vol. 40, no 13-14, 6218-6233 p.Article in journal (Refereed) PublishedText
Abstract A detailed study of a swirling flow in a tube is presented in the first part of the paper. A simplified analytical solution of the governing equations indicates specific modes of the tangential velocity and that the decay of the swirl effect is exponential. The problem is then solved in three dimensions using computational fluid dynamics (CFD) and a comparison with analytical expressions shows that the CFD code is reliable in terms of accuracy. The CFD results confirm that a fundamental swirling mode is reached within a short distance from the inlet. The torque swirl number is introduced to physically estimate the intensity of the swirl. A companion value is given: it is the average deviation.
Place, publisher, year, edition, pages
2016. Vol. 40, no 13-14, 6218-6233 p.
Laminar, Decay, Swirl, Analytical, Boundary condition, OpenFOAM
Applied Mechanics Fluid Mechanics and Acoustics
Research subject ENGINEERING, Manufacturing and materials engineering; ENGINEERING, Mathematics
IdentifiersURN: urn:nbn:se:hv:diva-9299DOI: 10.1016/j.apm.2016.02.002ISI: 000377921900002ScopusID: 2-s2.0-84966430130OAI: oai:DiVA.org:hv-9299DiVA: diva2:917763
Available online 12 February 20162016-04-072016-04-072016-12-16Bibliographically approved