Faculty Publications
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Item Mixing in Oscillating Lid Driven Cavity—A Numerical Study(Springer Science and Business Media Deutschland GmbH, 2021) Neeraj, M.P.; Maniyeri, R.The mixing problems are highly important to be dealt with in fluid mechanics. In the present work mixing in a lid driven cavity with constant top wall velocity and oscillating top wall velocity is addressed. The staggered grid system is used and discretization of continuity equation, Navier–Stokes equations and concentration equation are done using Finite Volume Method. The Euler Explicit scheme is used for solving the numerical problem. Firstly, the developed computational model is validated with that of other researcher’s results for the case of constant top wall motion. Then the simulation is done for oscillating top wall for a Reynolds number of 100 and two amplitudes. The results in both cases are compared. © 2021, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.Item Numerical Study of Mixed Convection in Single and Double Lid Driven Cavity Using LBM(Springer Science and Business Media Deutschland GmbH, 2021) Sen, S.; Arumuga Perumal, D.; Yadav, A.K.The lattice Boltzmann method (LBM) has been gaining popularity over the last two decades and the method has been extended from simple fluid flow problems to problems involving heat transfer. In the present work, an attempt is made to model cases involving mixed convection. Two types of problems are considered in this study; the first one dealing with mixed convection in a single-sided lid-driven cavity and the second one dealing with mixed convection in a double-sided lid-driven cavity in parallel and anti-parallel configurations at constant Prandtl number and various values of Richardson number. For the first problem, a square domain is considered with a moving lid at a lower temperature while the stationary wall at the bottom at a higher temperature. The cavity side walls are treated with an adiabatic boundary condition. In LBM, a forcing term dependent on temperature difference is utilized to vary the value of y-velocity in order to satisfy the effects of gravity on mixed convection. A grid independence study is conducted to show that the results are independent of the grid chosen, and good agreement with literature is achieved. The second problem is an extension of the first one; the cavity bottom wall is first given a velocity in the opposite direction, and then in the same direction, and the velocity streamlines, temperature contours and local Nusselt number variation in the top wall for these cases are plotted. The developed method helps in the visualization of various phenomena such as splitting of flow into two halves for the parallel configuration and formation of secondary vortices with high Reynolds number. © 2021, Springer Nature Singapore Pte Ltd.Item Numerical study of oscillating lid driven cavity with the presence of an obstacle using immersed boundary method(Elsevier Ltd, 2022) Yaswanth, D.; Maniyeri, R.In this paper, an oscillating lid driven cavity with an obstacle at center is simulated to study the effects on fluid mixing for various oscillating frequency (ω) and Reynolds number (Re). The oscillating lid promotes the generation of vortices and further presence of an obstacle breaks them into multiple sub-vortices which greatly enhance fluid mixing. This study is carried out to find the optimum parameters of the fluid mixing. It is performed by discretizing continuity and momentum equations using finite volume method on staggered grid system. The fluid–structure interaction is studied using feedback forcing scheme based immersed boundary method (IBM). A numerical model is developed and validated with previous results, and then simulations are carried out for different Re and ω to find the optimum for efficient fluid mixing inside the cavity. © 2022