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Numerical study of turbulent channel flow laden with finite-size non-spherical particles
KTH, Skolan för teknikvetenskap (SCI), Mekanik. KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW. KTH, Centra, SeRC - Swedish e-Science Research Centre.ORCID-id: 0000-0002-4346-4732
KTH, Skolan för teknikvetenskap (SCI), Mekanik. KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW. KTH, Centra, SeRC - Swedish e-Science Research Centre.
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2017 (Engelska)Ingår i: 10th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2017, International Symposium on Turbulence and Shear Flow Phenomena, TSFP10 , 2017, Vol. 4Konferensbidrag (Refereegranskat)
Abstract [en]

We present interface-resolved numerical simulations of turbulent channel flow laden with non-spherical rigid and neutrally-buoyant particles. We first focus on the case of oblate particles of aspect ratio 1/3 at volume fractions up to 15% and show that the turbulent drag is decreasing when increasing the particle volume fraction although the effective viscosity of the suspension actually increases. We relate the observed drag reduction to turbulence attenuation and to particle migration away from the near-wall region. Particles tend to align parallel to the wall with rotation rates significantly lower than those reported for spheres. In the second part of the study, we examine the effect of the particle slenderness on the observed drag reduction and show that the drag increases for flatter particles.

Ort, förlag, år, upplaga, sidor
International Symposium on Turbulence and Shear Flow Phenomena, TSFP10 , 2017. Vol. 4
Nationell ämneskategori
Strömningsmekanik och akustik
Identifikatorer
URN: urn:nbn:se:kth:diva-217854Scopus ID: 2-s2.0-85033375570ISBN: 9780000000002 (tryckt)OAI: oai:DiVA.org:kth-217854DiVA, id: diva2:1158071
Konferens
10th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2017, Swissotel Chicago, United States, 6 July 2017 through 9 July 2017
Forskningsfinansiär
Swedish e‐Science Research Center
Anmärkning

QC 20171117

Tillgänglig från: 2017-11-17 Skapad: 2017-11-17 Senast uppdaterad: 2017-11-17Bibliografiskt granskad

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Brandt, L.uca

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Brandt, L.ucaArdekani, Mehdi Niazi
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MekanikLinné Flow Center, FLOWSeRC - Swedish e-Science Research Centre
Strömningsmekanik och akustik

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