You're invited to attend
Master's Proposal
Isabel Fernandez
(Advisor: Prof. Juergen Rauleder)
"Evaluation of Boundary Condition Treatments for Complex Geometries in Lattice-Boltzmann Flow Simulations"
Thursday, January 13
10:00 a.m.
Weber 200
Abstract:
This study aims to implement and assess different boundary conditions in the Lattice-Boltzmann method as they are applied to more complex geometric shapes. The Lattice-Boltzmann Method is currently being explored as an alternative flow solver for use in high-speed or real-time applications like pilot flight simulators. The Lattice Boltzmann framework used in this study is a GPU accelerated version of the OpenLB C++ library, a highly parallelizable program that allows for increased computational speed. The LBM models fluid domain as a set of square lattices aligned to a Cartesian grid. While this allows for a much more computationally efficient analysis, this can result in challenges when modeling solid structures within the fluid flow, as the objects are often represented with a staircase approximation, requiring a high resolution to represent curved features. Different boundary conditions that account for curved geometry are implemented in the current Lattice-Boltzmann framework and different near-body flow parameters are evaluated for complex geometric shapes. This study compares simple bounce-back boundary conditions, an extrapolation method for curved surfaces proposed by Filippova and Hanel and improved upon by Mei, Luo, and Shyy (MLS), an interpolated bounce-back method proposed by Bouzidi, Firdaouss, and Lallemand (BFL), and a unified interpolated bounce-back method proposed by Yu, Mei, and Shyy (YMS). These methods were implemented using both no-slip/non-moving wall assumptions and moving-wall/slip assumptions.
Committee:
- Prof. Juergen Rauleder – School of Aerospace Engineering (advisor)
- Prof. Marilyn Smith – School of Aerospace Engineering
- Prof. Lakshmi Sankar– School of Aerospace Engineering
