Session: 08-06-01 non-presentations

Paper Number: 122743

122743 - Numerical Investigation of Vibrating Cylinder Using a Lattice Boltzmann Approach 

Conventionally, the Navier-Stokes equations are solved over a moving grid to understand the flow induced forces acting on an actively vibrating body by adhering to the continuum assumption, specifically macroscopic flows. However, the main challenge in solving these equations lies in the nonlinear nature of the advection/convective term and as well as updating the fluid mesh to account for the vibrating structure’s movement at the end of each time-step/non-linear iteration. Consequently, solving the Navier-Stokes equations becomes computationally demanding and expensive for large-scale computational fluid dynamics based fluid structure interaction problems. Over the past two decades Lattice Boltzmann method (LBM) has rapidly evolved as a computational method that efficiently simulates fluid-structure interaction. LBM’s inherent simplicity and local nature make it amenable to efficient parallelization by leveraging modern multi-core processors and graphic processing units to improve the performance and speed of simulations. LBM considers the system at the mesoscale level, where the discretization of the Boltzmann equation brings in exact advection. However, the Chapman-Enskog analysis provides us an understanding in the connection between the equation resolved by discretizing the Boltzmann equation and the macroscopic Navier Stokes equations. As a result of which LBM becomes capable enough to solve macroscopic flow problems as well.

The present study considers a two-dimensional configuration of the lattice structure with nine quadrature points.  This study presents the dynamics of a vibrating circular cylinder in an unconfined flow, through the implementation of the lattice Boltzmann Method (LBM). Systematic parametric simulations as a function of vibration amplitudes (0.05D to D) and frequencies (0.1D/U to 0.5D/U), where D is diameter of the cylinder and U is the freestream velocity. The fluid dynamic force coefficients and the computational time will be compared against commercial CFD packages to demonstrate the capabilities.

Presenting Author: Vemu Sahiti Birla Institute of Technology and Science Pilani, Hyderabad Campus

Presenting Author Biography: A research scholar in BITS-Pilani, Hyderabad campus specializing in CFD development.

Authors:

Vemu Sahiti Birla Institute of Technology and Science Pilani, Hyderabad Campus
P S Gurugubelli Birla Institute of Technology and Science Pilani, Hyderabad Campus
V K Surasani Birla Institute of Technology and Science Pilani, Hyderabad Campus