Change search
ReferencesLink to record
Permanent link

Direct link
Dynamic interaction of fixed dual spheres for several configurations and inflow conditions
KTH, School of Engineering Sciences (SCI), Mechanics.ORCID iD: 0000-0001-9976-8316
2010 (English)In: European journal of mechanics. B, Fluids, ISSN 0997-7546, E-ISSN 1873-7390, Vol. 29, no 1, 43-52 p.Article in journal (Refereed) Published
Abstract [en]

The changes in force characteristics as well as the shedding patterns for various dual sphere configurations are studied. The Reynolds numbers considered are 300, 600 and two different inflow conditions are used: steady and pulsating. The sphere formations are defined by the separation distance D-0 between the spheres and the angle between the line connecting the centres of the spheres and the main flow direction, gamma. The position of one of the spheres is varied in the range 0 degrees-90 degrees using a 15 degrees increment. Two separation distances are studied; 1.5D and 3D. The method used for the simulations is the Volume of Solid (VOS) approach, a method based on Volume of Fluid (VOF). A major conclusion from this work is that the sphere interaction alters the wake dynamics by obstructing the vortex shedding (generating a steady wake or a wake with lower Strouhal number) and by changing the direction of the lift force so that it in most cases is directed in the plane containing the sphere centres. The results also show that changing the inflow condition gives the same relative change in drag and lift as for a single sphere. The drag is substantially reduced by placing the sphere downstream in a tandem arrangement and slightly increased in a side-by-side arrangement. However, the effect is decreased by increasing separation distance and increasing Reynolds number.

Place, publisher, year, edition, pages
2010. Vol. 29, no 1, 43-52 p.
Keyword [en]
Particle interactions, Volume of Solid (VOS), Wake structures
National Category
Mechanical Engineering
URN: urn:nbn:se:kth:diva-29102DOI: 10.1016/j.euromechflu.2009.09.003ISI: 000272928900005ScopusID: 2-s2.0-71649113595OAI: diva2:391457
Swedish Research Council
QC 20110125Available from: 2011-01-25 Created: 2011-01-25 Last updated: 2011-01-25Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Prahl, Lisa
By organisation
In the same journal
European journal of mechanics. B, Fluids
Mechanical Engineering

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 31 hits
ReferencesLink to record
Permanent link

Direct link