Towards Topology Optimization of Three-Dimensional Fluid-Structure Interaction Problems Considering Flow-Induced Vibration

• Grant number: 22/13175-2
• Support Opportunities: Regular Research Grants
• Start date: December 01, 2023
• End date: November 30, 2025
• Field of knowledge: Engineering - Mechanical Engineering
• Principal Investigator: Renato Picelli Sanches
• Grantee: Renato Picelli Sanches
• Host Institution: Escola Politécnica (EP). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Associated researchers: Bruno Souza Carmo ; Mike Xie

Abstract

Structural topology optimization faces serious challenges when applied to fluid-structure interaction problems. We propose to develop base research for topology optimization of these problems with applications to important engineering systems, such as bridges under flow-induced vibration. The core product of this research is to produce a three dimensional (3D) topology optimization framework that results in new insights about the design of fluid-structure systems. The challenges include the incorporation of a 3D geometry smoothing tool into the optimization framework, the many design variables involved in the 3D problem and the adequate formulation of resonance constraints. The optimization solver will be based on sequential integer linear programming. The structure will be modeled with linear and non-linear elasticity, while the fluid will be governed by the Reynolds-Averaged Navier-Stokes equations and a chosen turbulence model, e.g., the k-omega SST. The governing equations will be solved via the Finite Element Method (FEM). The optimization method will be based on the separation of optimization and analysis (FEM) meshes to reduce the computational cost and solve large-scale 3D problems. The necessary degrees of refinement of the two meshes will be investigated. (AU)