School of Engineering and Sustainable Development
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Browsing School of Engineering and Sustainable Development by Author "Abdalla, I. E."
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Item Metadata only Coherent structures and flow topology of transitional separated-reattached flow over two and three dimensional geometrical shapes(American Institute of Physics, 2017) Diabil, H. A.; Abdalla, I. E.; Li, X. K.Large-scale organized motions (commonly referred to coherent structures) and flow topology of a transitional separated-reattached flow have been visualised and investigated using flow visualisation techniques. Two geometrical shapes including two-dimensional flat plate with rectangular leading edge and three-dimensional square cylinder are chosen to shed a light on the flow topology and present coherent structures of the flow over these shapes. For both geometries and in the early stage of the transition, two-dimensional Kelvin-Helmholtz rolls are formed downstream of the leading edge. They are observed to be twisting around the square cylinder while they stay flat in the case of the two-dimensional flat plate. For both geometrical shapes, the two-dimensional Kelvin-Helmholtz rolls move downstream of the leading edge and they are subjected to distortion to form three-dimensional hairpin structures. The flow topology in the flat plate is different from that in the square cylinder. For the flat plate, there is a merging process by a pairing of the Kelvin-Helmholtz rolls to form a large structure that breaks down directly into many hairpin structures. For the squire cylinder case, the Kelvin-Helmholtz roll evolves topologically to form a hairpin structure. In the squire cylinder case, the reattachment length is much shorter and a forming of the three-dimensional structures is closer to the leading edge than that in the flat plate case.Item Metadata only Computational analysis and flow structure of a transitional separated-reattached flow over a surface mounted obstacle and a forward-facing step.(Taylor and Francis, 2009) Yang, Z.; Cook, M. J.; Abdalla, I. E.Item Metadata only Computational visualisation of separated-reattached transitional flow on a blunt plate.(Begell House, 2004) Abdalla, I. E.; Yang, Z.Item Metadata only Effects of free-stream turbulence on a transitional separated-reattached flow over a flat plate with a sharp leading edge.(Elsevier Science, 2009) Yang, Z.; Abdalla, I. E.Item Metadata only Effects of free-stream turbulence on large-scale coherent structures of separated boundary layer transition.(John Wiley, 2005-06-01) Abdalla, I. E.; Yang, Z.Item Metadata only Large-eddy simulation of buoyancy-driven natural ventilation in an enclosure with a point heat source.(2007-06-01) Cook, M. J.; Abdalla, I. E.; Rees, S. J.; Yang, Z.Item Metadata only Numerical study of a separated - reattached flow on a blunt plate(American Institute of Aeronautics and Astronautics Journal, 2005-12-01) Abdalla, I. E.; Yang, Z.Item Metadata only Numerical study of the instability mechanism in transitional separating-reattaching flow(Elsevier, 2004-12-01) Abdalla, I. E.; Yang, Z.Item Metadata only Numerical study of thermal plume characteristics and entrainment in an enclosure with a point heat source.(Hong Kong Poly University, 2009) Abdalla, I. E.; Cook, M. J.; Hunt, G. R.Item Metadata only Numerical study of transitional separated-reattached flow over surface-mounted obstacles using large-eddy simulation(John Wiley, 2006-11-01) Abdalla, I. E.; Cook, M. J.; Yang, Z.Item Metadata only Theoretical and experimental analysis of ultrasonic cross correlation flow measurement technology.(Curran Associates, 2010) Gurevich, A.; Selvaratnarajah, S.; Abdalla, I. E.