Conference Papers

Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/28506

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Author: search.filters.author.Maniyeri, R.Subject: search.filters.subject.Fluid-structure interaction

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    Numerical study on fluid flow through collapsible channels
    (Springer, 2020) Dhruv, V.; Mishra, U.; Maniyeri, R.
    The fluid flow in collapsible channels or tubes is an interesting problem with several physiological applications; for example, blood flow in veins, air flow in lungs and wheezing. In this paper, we present a fluid-structure interaction based model for single-phase fluid flow through a microchannel containing two elastic walls. A two-dimensional model is developed and simulations have been performed using a commercial software. The deforming geometry is analyzed using moving mesh. The flow field and deformation of the elastic walls for different boundary loads and inlet flow conditions are presented and discussed. © Springer Nature Singapore Pte Ltd. 2020.
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    Dynamics of Flexible Filament in Viscous Oscillating Flow
    (Springer Science and Business Media Deutschland GmbH, 2020) Kanchan, M.; Maniyeri, R.
    The dynamics of flexible filament in a viscous fluid is a complex fluid–structure interaction problem that has wide scientific and engineering applications in emerging fields such as biomimetics and biotechnology. Coupling the structural equations with fluid flow poses a number of challenges for numerical simulation. In this regard, techniques like immersed boundary method (IBM) have been quite successful. In the present study, a two-dimensional numerical simulation of flexible filament in a rectangular channel with an oscillating fluid flow at low Reynolds number is carried out using IBM. The discretization of governing continuity and Navier–Stokes equation is done by finite volume method on a staggered Cartesian grid. SIMPLE algorithm is used to solve fluid velocity and pressure terms. The filament mechanical properties like stiffness and bending rigidity are incorporated into the governing equation via Eulerian forcing term. An oscillating pressure gradient drives the fluid while the flexible filament is fixed to the bottom channel wall. The simulation results are validated with filament dynamic studies of previous researchers. The interaction of the filament with nearby oscillating fluid motion is well captured by the developed numerical model. © 2020, Springer Nature Singapore Pte Ltd.
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    Modeling and simulation of fluid-structure interaction using smoothed particle hydrodynamics
    (Elsevier Ltd, 2021) Antony, J.; Maniyeri, R.
    Analyzing fluid-structure interactions (FSI) is crucial in many engineering applications from modeling of blood flow to design of aircrafts. FSI problems are normally simulated using grid based methods, which is complicated and challenging due to the difficulties in modeling large deformations. In this work, we present a numerical model developed for solving FSI problems using smoothed particle hydrodynamics (SPH), which is a meshless particle based Lagrangian method widely used for solving fluid mechanics and heat transfer problems. Being meshless method, the discretization of complex domains and treatment of large deformations becomes easier in SPH. It has an attractive feature that the interpolating nodes also function as material component by carrying properties of the material and move according to the internal and external interactions. SPH uses a smoothing kernel function to approximate the field variables and its derivatives at a node from its neighboring nodes. With this perspective, we developed a numerical model to simulate the flow through a square lattice of stationary cylinders. The developed model captured the fluid dynamics and the velocity contour and the streamlines plot obtained are in good agreement with available results in the literature. We believe that this model can be extended to investigate complex fluid-structure interaction problems involving moving and deformable structures. © 2021 Elsevier Ltd.
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    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