Turbulent shear flows subject to system rotation
Doctoral thesis
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http://hdl.handle.net/11250/233419Utgivelsesdato
2009Metadata
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Sammendrag
Turbulent flows in rotating frame-of-reference are of considerable interest in a variety of industrial, geophysical and astrophysical applications. In these flows, the system rotation induces additional body forces, i.e. centrifugal and Coriolis forces, acting on the turbulent flow, so that the momentum mechanism becomes more complicated. The present doctoral thesis concerns the system rotation influence on turbulent shear flows. To this end, direct numerical simulations (DNSs) have been performed in order to investigate the effect of system rotation on different turbulent flow configurations including plane Couette flow, sudden expansion flow and wake behind a flat plate. In addition, the PIV measurements for rotating plane channel and sudden expansion flows have been carried out in order to support the numerical simulations results.
A realistic turbulent inflow boundary condition is needed in order to perform direct numerical simulations for spatially developing flows subjected to system rotation such as rotating sudden expansion flows. The cost effective method is introduced based on a separate (precursor) simulation in order to establish fully turbulent inflow including wide ranges of length and time scales needed in the direct numerical simulations. On the other hand, the characteristic features of the rotating turbulent flows were investigated by means of three-dimensional flow visualization, two-point correlations and transport for the individual second-moments of the velocity and vorticity fluctuations.
Består av
Barri, Mustafa Ali Mustafa; Andersson, Helge Ingolf. Anomalous turbulence in rapidly rotating plane Couette flow. Advances in Turbulence XI, Proceedings of the 11th European Turbulence Conference - Proceedings in Physics - Dynamics of spheres in turbulent channel flow: 100-102, 2007. 10.1007/978-3-540-72604-3_30.Barri, Mustafa Ali Mustafa; Holstad, Anders; Andersson,, Helge Ingolf; Pettersen, Bjørnar. On turbulent plane Couette flow with and without rotation. Fourth national conference on Computational Mechanics: 103-111, 2007.
Barri, Mustafa; Andersson, Helge I.. Computer Experiments on Rapidly Rotating Plane Couette Flow. Communications in Computational Physics. (ISSN 1815-2406). 7(4): 683-717, 2010. 10.4208/cicp.2009.09.068.
Visscher, J.; Andersson, H.; Barri, M.; Didelle, H.; Viboud, S.; Sous, D.; Sommeria, J.. A new set-up for PIV measurements in rapidly rotating turbulent duct flows.. .
Barri, Mustafa; El Khoury, George K.; Andersson, Helge I.; Pettersen, Bjørnar. Inflow conditions for inhomogeneous turbulent flows. International Journal for Numerical Methods in Fluids. (ISSN 0271-2091). 60(2): 227-235, 2009. 10.1002/fld.1884.
Mustafa, Barri; George, K. El Khoury; Helge, I. Andersson; Bjørnar, Pettersen. DNS of backward-facing step flow with fully turbulent inflow. International Journal for Numerical Methods in Fluids. (ISSN 0271-2091), 2009. 10.1002/fld.2176.
El Khoury, George K.; Andersson, Helge I.; Barri, Mustafa; Pettersen, Bjørnar. Massive separation of turbulent Couette flow in a one-sided expansion channel. International Journal of Heat and Fluid Flow. (ISSN 0142-727X). 31(3): 274-283, 2010. 10.1016/j.ijheatfluidflow.2010.01.008.
El Khoury, G. K; Barri, M; Andersson, H. I.; Pettersen, B.. DNS of orifice flow with turbulent inflow conditions. Proceedings of the Seventh International ERCOFTAC Workshop on Direct and Large-Eddy Simulation, held at the University of Trieste, September 8-10, 2008: 81-84, 2010. 10.1007/978-90-481-3652-0_12.
Mustafa, Barri; El Khoury, George K.; Andersson, Helge I.; Pettersen, Bjørnar. Massive separation in rotating turbulent flows. Springer Proceedings in Physics - Proceedings of the 12th EUROMECH European Turbulence Conference: 625-628, 2009. 10.1007/978-3-642-03085-7_150.
Barri, M.; Andersson, H. I.. Turbulent flow in a sudden-expansion channel.. .
Barri, M.; Andersson, H. I.. Turbulent flow in a sudden-expansion channel.. .
Khaledi, Hatef A.; Barri, Mustafa; Andersson, Helge I.. On the stabilizing effect of the Coriolis force on the turbulent wake of a normal flat plate. Physics of fluids. (ISSN 1070-6631). 21(9): 095104, 2009. 10.1063/1.3225147.