Sustainable passive vibration control of fuel cells on fluid structure interaction

• The wake width along the flow partition line is witnessed to be expanding around the control structures surrounding the control rods, and further, it is reducing at a certain distance in the downstream. • Swirling flow is identified to be more significant in the development of sloping three-dimensional flow structures with a low-frequency force coefficient in spite of the induced high-frequency force coefficient resulted due to the Karman vortices. • The observed wake vortex near the test structures exhibits an intermittent discrepancy throughout the length in the direction of span wise. • In spite of the free shear layer, the shedding of vortices with a like frequency is developed and is further complicated to sway up to become an established vortex formation at an advanced location in the downstream. • The perfectly organized vortex for a greater range of wave sharpness shows a noteworthy influence on the inconsistent lift force. • The span wise waviness due to increased flow velocity has a significant impact on the reduction of drag force coefficient. • Only a minor peak raise in the amplitude response for the case 4 and case 5 is identified, it is because of the control tubes positioned in the upstream condition act as a force barrier and reduce the displacement effects due to the flow impact directly on the control rods structures. • The stagnation point is observed to be at θ ≈ 71 ∘ , and the base pressure coefficient is observed to be C p b ≈ 0.96 . A passive vibration control study has been carried out to understand the nature of fluid structure interaction on control rods. Further to identify the possible ways to preserve the structural integrity by isolating the impact of vibration. In regards, by employing multiple control tubes to assess the characteristics of induced vibration and flow dynamics over a fuel cell structures in different orientation at a subcritical Reynolds number (Re=18685) has been proposed. An experimental and numerical investigation has been performed to understand the influence of control tubes over the test structure. The computational study has been performed by employing the Large Eddy Simulation technique to estimate the flow characteristics and it dynamics over the test structures. Similarly, the experimental investigation also focussed on understanding nature of control rods subjected fluid flow with an influence of control tubes. In this study nine different cases were taken into consideration for the better understanding on the proposed idea. It is mainly focussed on the amplitude response with respect to the force coefficients. Further, it examines the near wake flow structure, instantaneous flow field, mean flow field, turbulent intensity, vortex length and mean pressure distribution for all the considered cases. The swirling flow is identified to be more significant in the development of sloping three-dimensional flow structures with a low-frequency force coefficient despite the induced high-frequency force coefficient resulted due to the Karman vortices. In addition, the perfectly organized vortices observed for a larger value of wave sharpness reveals a noteworthy influence on the inconsistency in the lift force. Only a minor peak raise in the amplitude response for the case 4 and case 5 is identified. It is because of the control tubes positioned in the upstream condition causes a blockade effect on the excessive forces on the tube structures, and reduces the displacement effects due to the flow impact directly on the control rods structures. At last, the base pressure coefficient is observed to be c p ≈ 0.96 along with the stagnation point at θ ≈ 71 0 .