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Swirl-switching phenomenon in turbulent flow through toroidal pipes
KTH, Skolan för teknikvetenskap (SCI), Mekanik.ORCID-id: 0000-0001-7734-0466
KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW. KTH, Centra, SeRC - Swedish e-Science Research Centre. KTH, Skolan för teknikvetenskap (SCI), Mekanik.ORCID-id: 0000-0001-9627-5903
2015 (engelsk)Inngår i: 9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015, TSFP-9 , 2015Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

Direct numerical simulations (DNS) are performed to investigate turbulent flows in toroidal pipes with mild and strong curvature. By means of proper orthogonal decomposition (POD), dominant structures in the flow field are identified. The most energetic structures in the strongly curved pipes (κ = 0.1 and κ = 0.3) are very similar in both configurations studied here. These modes (shape and frequency) also match the coherent structures responsible for swirl switching phenomenon found earlier in experimental and numerical studies of turbulent flow in spatially developing 90° bends with which the current results are compared. The observed swirl switching in toroidal pipes, which is isolated from any upstream and separation conditions, may challenge the current hyphothesis regarding the origin of swirl switching mechanism.

sted, utgiver, år, opplag, sider
TSFP-9 , 2015.
Emneord [en]
Principal component analysis, Switching, Turbulence, Turbulent flow, Coherent structure, Curved pipes, Experimental and numerical studies, Proper orthogonal decompositions, Separation condition, Switching mechanism, Switching phenomenon, Shear flow
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-222958Scopus ID: 2-s2.0-85034436337ISBN: 9780000000002 (tryckt)OAI: oai:DiVA.org:kth-222958DiVA, id: diva2:1193499
Konferanse
9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015, 30 June 2015 through 3 July 2015
Merknad

QC 20180327

Tilgjengelig fra: 2018-03-27 Laget: 2018-03-27 Sist oppdatert: 2022-12-07bibliografisk kontrollert

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Noorani, AzadSchlatter, Philipp

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