FLOW INTERFERENCE BETWEEN TANDEM CYLINDER WITH FORCED CONVECTION IN STAGGERED POSITION

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    Abstract

    Flow-induced vibration of the filleted (rounded corner) oscillating cylinder is numerically investigated at Re=150 and Pr=0.7. The upstream cylinder (UC) is static while the downstream cylinder (DC) is elastically mounted which is allowed to vibrate in the transverse direction with a spacing ratio (L/D) =5 and staggered angle (∝) of 45°. Square cylinder is gradually filleted into the circular cylinder by changing r* (filleted radius)=0 (square cylinder), 0.5, 0.75 and 1(circular cylinder). Computations were carried out for reduced mass m = 10 and varying reduced velocity (Ur)= 2, 4, 6, 8 and 10, structural damping constant is set to be zero which gives rise to high vibrational amplitude. Both cylinders were maintained at a constant temperature (T = 1) while the upcoming flow is set to be at T = 0. Vibrational characteristics are scrutinized with help of frequency characteristics of vibrating cylinder, vibrational amplitude, drag coefficient, lift coefficient and instantaneous z-vorticity contours. When natural frequency (fn) and vortex shedding frequency (fs) overlap, it causes synchronization or lock-in. The lock-in phenomenon usually occurred at Ur = 6 leading to higher vibrational amplitude for all geometries and dropped at Ur = 8 but persisted at Ur = 8 and 10 for r*=0. Due to higher vibrational amplitude, the flow structure is more complicated at Ur ≥ 6. The maximum value of average Nusselt number (Nuavg) is at Ur = 6 for circular DC, whereas the minimum lies at Ur = 2 for square upstream cylinder. Generated results envisage results of flow interferences and forced convection of tube arrays in heat exchangers and marine structures. Understanding the mechanisms of flow-induced vibration in staggered cylinders is crucial for designing and optimizing these systems, as well as for ensuring their safe and reliable operation.

    Original languageBritish English
    Title of host publicationProceedings of ASME 2023 Heat Transfer Summer Conference, HT 2023
    PublisherThe American Society of Mechanical Engineers(ASME)
    ISBN (Electronic)9780791887165
    DOIs
    StatePublished - 2023
    EventASME 2023 Heat Transfer Summer Conference, HT 2023 - Washington, United States
    Duration: 10 Jul 202312 Jul 2023

    Publication series

    NameProceedings of ASME 2023 Heat Transfer Summer Conference, HT 2023

    Conference

    ConferenceASME 2023 Heat Transfer Summer Conference, HT 2023
    Country/TerritoryUnited States
    CityWashington
    Period10/07/2312/07/23

    Keywords

    • FIV
    • Flow interference
    • Heated Cylinder
    • Staggered Position

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