Fluid Structure Interaction (FSI)

The Fluid-structure Interaction (FSI) Capability Group focuses on the interaction of movable or deformable structures with an internal or surrounding fluid flow. This interaction has been a crucial consideration in many engineering applications. The aim of this research is to develop advanced computational techniques and models to predict coupled FSI applications with highly effective, accurate, massively scalable performance.

Adequate solvers for fluid and solid mechanics alone are well developed. Challenges arise at the junction of the two fields – where the motion of the fluid and response from solid cannot be decoupled. Simulating such FSI problems need to deal with not only large differences in spatio-temporal scales, but also completely different physical properties of each medium. We have developed advanced methodologies in our group for four main key components: robust flow and structural solvers, coupling algorithms and mesh generation techniques.

At FSI group, we continue to expand the core capabilities in various areas with a stronger emphasis on applying the existing and future development for potential applications with industrial and academic partners. In particular, we will reinforce our strategies and focus the research and development in the following areas:

Marine-Offshore Hydrodynamics
The program focuses on building fundamental capabilities for marine-offshore applications with great interests from various industries and academic. This focus presents a very broad research of multi-scale and multi-physics in nature. In particular, we will aim at the following research topics:
  • Three-dimensional vortex induced vibrations simulations of riser arrays
  • Strong nonlinear hydrodynamics for wave run-up for semi-submersible platform

Figure 5: Simulations of wave impact on spar-buoy floating structure.


CFD-based Risk Analysis

Computational fluid dynamics (CFD) has been used as a reliable tool for risk analysis, consequence study as well as mitigation planning. The current research focuses on building physical models and numerical simulation techniques for pollutant dispersion in urban-scale areas, improvement of blast and explosive impact simulations as well as uncertainty (stochastic) and risk analysis. The main application areas in the current research theme are:
  • Blast/explosion impact prediction and analysis
  • Evaluation, design of protective structure
  • Offshore structure risk analysis (leak, explosion…)

Figure 6:Blast wave propagation in a large scale urban area.(left) Prediction of structure response under the impact of strong blast wave.(right)


Aerodynamics

In this focus, we aim to develop a novel approach for aerodynamics simulations and aeroelasticity using nonlinear FSI analysis. This problem poses several challenges required to address in full detail. In particular, the main research topics in this theme are:
  • Enhancement of lift-drag prediction (DPWs, HiLIFT)
  • Turbulence modelling (LES)
  • Gust load simulations
  • Wind turbine aerodynamics, rotorcraft aerodynamics

Biological Flows
This study aims at building up capabilities for simulations of biological flows for in-vitro diagnostic and design of medical devices. This research is intrinsically multi-disciplinary and requires broad investigations and extensive development. Our particular interests are:
  • Simulations of patient-specific cardiovascular system (including human heart, arteries...) using FSI approach.
  • Development of heart valve simulator assisting valve design and surgery optimizations.

Figure 7:Velocity contours and vectors in human heart left ventricle over one cardiac cycles.

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