• experimental investigation of wave-current flow on a two-dimensional bed-form

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 726
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     flow structure is important in physical and numerical modelling specially as related to sediment transport problems. numbers of studies have been carried out on wave-current flow conditions without taking the bed-form into consideration. submerged structures and obstacles could significantly alter not only the flow parameters like as turbulence intensity, reynolds stresses and correlation coefficient but also the boundary layer parameters will be affected.experimental studies of flow-bed forms interaction started with investigation in laboratory canals and the researchers tried classified different forms of bed related to current conditions. modern experimental techniques as hot wire, hot film and laser doppler anemometery (lda), helped detail analyzing mean flow and turbulence field related to bed forms as ripples and dunes. previous studies showed sensivity of flow to the bed forms so the influence of topographic acceleration and deceleration of flow due to these forms should be considered. in current condition on downstream of the dune crest, vertical component of the velocity are negative, i.e., singe of a recirculation zone and separation point . acceleration could alter logarithmic mean-velocity profile, too.

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