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Investigation of fluid particle dispersion in stably stratified turbulence
KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW.ORCID-id: 0000-0002-9819-2906
KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW.
2009 (Engelska)Ingår i: 6th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2009, International Symposium on Turbulence and Shear Flow Phenomena, TSFP , 2009, s. 1160-1163Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

Numerical simulations are used to study vertical dispersion of fluid particles in homogeneous turbulent flows with a stable stratification (Brethouwer and Lindborg, 2009). The results of direct numerical simulations are in good agreement with the relation for the long time fluid particle dispersion, δz2 = 2εP t/N2, derived by Lindborg and Brethouwer (2008), though with a small dependence on the buoyancy Reynolds number. Here, δz2 is the mean square vertical particle displacement, εP is the dissipation of potential energy, t is time and N is the Brunt-Väisälä frequency. Simulations with hyperviscosicity are performed to verify the relation δz2 = (1 + πCP L)2εP t/N2 for N−1 t T, where N is the Brunt-Väisälä frequency and T is the turbulent eddy turnover time. The simulation results approach the relation for increasing stratification and we find that CP L is about 3 in strongly stratified fluids. The onset of a plateau in δz2 is observed in the simulations at t ∼ T . 

Ort, förlag, år, upplaga, sidor
International Symposium on Turbulence and Shear Flow Phenomena, TSFP , 2009. s. 1160-1163
Nyckelord [en]
Dispersions, Numerical models, Potential energy, Reynolds number, Turbulence, Fluid particles, Mean square, Particle displacement, Stratified fluid, Stratified turbulence, Turbulent eddy, Turnover time, Vertical dispersion, Shear flow
Nationell ämneskategori
Strömningsmekanik och akustik
Identifikatorer
URN: urn:nbn:se:kth:diva-237224Scopus ID: 2-s2.0-85048394710OAI: oai:DiVA.org:kth-237224DiVA, id: diva2:1258903
Konferens
6th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2009
Anmärkning

QC 20181026

Tillgänglig från: 2018-10-26 Skapad: 2018-10-26 Senast uppdaterad: 2018-10-26Bibliografiskt granskad

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Brethouwer, Gert

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Brethouwer, GertLindborg, Anders V.
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Linné Flow Center, FLOW
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