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dc.contributor.authorZhao, Lihaonb_NO
dc.date.accessioned2014-12-19T11:50:09Z
dc.date.available2014-12-19T11:50:09Z
dc.date.created2013-04-16nb_NO
dc.date.issued2012nb_NO
dc.identifier616413nb_NO
dc.identifier.isbn978-82-471-3292-0 (printed ver.)nb_NO
dc.identifier.isbn978-82-471-3293-7 (electronic ver.)nb_NO
dc.identifier.urihttp://hdl.handle.net/11250/235037
dc.description.abstractThe overall objective of this doctoral thesis is to investigate how tiny particles are dispersed in a turbulent channel flow and how the fluid turbulence is modulated due to the presence of particles. Both spherical and prolate spheroidal particles are considered in present work and their translational and rotational motions are described in a Lagrangian framework using point-particle approximation. The turbulence of the fluid phase is obtained by means of direct numerical simulation (DNS). Accounting for the feed-backs from the particles onto the flow field, a novel scheme of torque-coupling has been developed and implemented together with the more conventional force-coupling in current program. In the case of spherical particle Reynolds number effect on particle velocity statistics and Stokes number effect on the particle slip velocity have been explored in dilute suspension flow with one-way coupling approach. The study on turbulence modulations by spherical particles has been carried out in two-way coupled simulations. The effects of Stokes number and particle volume fraction have been mainly investigated and the mechanisms of particle-turbulence interaction were elucidated by kinetic energy transfer and particle induced dissipation between particle phase and local fluid phase. In the case of prolate spheroidal particle both torque-coupling and force-coupling has been applied in the simulations of particle suspension turbulent shear flow in which the turbulence modulations and particle orientations and spins have been examined. Some results on the comparison of Lagrangian approach and statistical approach in simulating the particle suspensions were presented.nb_NO
dc.languageengnb_NO
dc.publisherNorges teknisk-naturvitenskapelige universitet, Fakultet for ingeniørvitenskap og teknologi, Institutt for energi- og prosessteknikknb_NO
dc.relation.ispartofseriesDoktoravhandlinger ved NTNU, 1503-8181; 2012:15nb_NO
dc.relation.haspartAndersson, Helge Ingolf; Zhao, Lihao. Computation of particle-laden turbulent flows. Proceedings of The 23rd Nordic Seminar on Computational Mechanics, 2010.nb_NO
dc.relation.haspartZhao, Lihao; Andersson, Helge. Statistics of particle suspensions in turbulent channel flow. Communications in Computational Physics. (ISSN 1815-2406). 11(4): 1311-1322, 2012. <a href='http://dx.doi.org/10.4208/cicp.080510.150511s'>10.4208/cicp.080510.150511s</a>.nb_NO
dc.relation.haspartZhao, Lihao; Marchioli, Cristian; Andersson, Helge. Stokes number effects on particle slip velocity in wall-bounded turbulence and implications for dispersion models. Physics of fluids. (ISSN 1070-6631). 24(2), 2012. <a href='http://dx.doi.org/10.1063/1.3690071'>10.1063/1.3690071</a>.nb_NO
dc.relation.haspartZhao, Lihao; Andersson, Helge Ingolf; Gillissen, J J J. Turbulence modulation and drag reduction by spherical particles. Physics of fluids. (ISSN 1070-6631). 22(8), 2010. <a href='http://dx.doi.org/10.1063/1.3478308'>10.1063/1.3478308</a>.nb_NO
dc.relation.haspartZhao, Lihao; Andersson, Helge I.. On particle spin in two-way coupled turbulent channel flow simulations. Physics of fluids. (ISSN 1070-6631). 23(9): 093302, 2011. <a href='http://dx.doi.org/10.1063/1.3626583'>10.1063/1.3626583</a>.nb_NO
dc.relation.haspartZhao, Lihao; Andersson, Helge Ingolf. Two-way coupled simulations of particle-laden wall turbulence. , 2011.nb_NO
dc.relation.haspartZhao, Lihao; Andersson, H.I.. On particle stress in gas-solid channel flows. .nb_NO
dc.relation.haspartZhao, Lihao; Andersson, Helge I.; Gillissen, Jurriaan J. J.. Interphasial energy transfer and particle dissipation in particle-laden wall turbulence. Journal of Fluid Mechanics. (ISSN 0022-1120). 715: 32-59, 2013. <a href='http://dx.doi.org/10.1017/jfm.2012.492'>10.1017/jfm.2012.492</a>.nb_NO
dc.relation.haspartAndersson, Helge; Zhao, Lihao. DNS of Non-Spherical Particles in Turbulent Flows. , 2010.nb_NO
dc.relation.haspartZhao, Lihao; Andersson, H.I.; Gillissen, J.J.J.. Comparison of Lagrangian approach and statistical approach in simulation of fiber suspension turbulent channel flow.. .nb_NO
dc.relation.haspartAndersson, Helge I.; Zhao, Lihao; Barri, Mustafa. Torque-coupling and particle-turbulence interactions. Journal of Fluid Mechanics. (ISSN 0022-1120). 696: 319-329, 2012. <a href='http://dx.doi.org/10.1017/jfm.2012.44'>10.1017/jfm.2012.44</a>.nb_NO
dc.subjectDirect numerical simulationsen_GB
dc.subjectwall turbulenceen_GB
dc.subjectspherical particleen_GB
dc.subjectprolate spheroidal particleen_GB
dc.subjectturbulence modulationen_GB
dc.subjectparticle dissipationen_GB
dc.subjecttwo-way couplingen_GB
dc.subjecttorque-couplingen_GB
dc.titleParticles in wall turbulencenb_NO
dc.typeDoctoral thesisnb_NO
dc.contributor.departmentNorges teknisk-naturvitenskapelige universitet, Fakultet for ingeniørvitenskap og teknologi, Institutt for energi- og prosessteknikknb_NO
dc.description.degreePhD i energi- og prosessteknikknb_NO
dc.description.degreePhD in Energy and Process Engineeringen_GB


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