What is FSI?|FSI Abaqus analysis
Fluid-Structure Interaction (FSI) refers to the mutual interaction between a fluid flow and a deformable or movable structure. It involves the exchange of forces, momentum, and energy between the fluid and the structure, resulting in dynamic behavior and deformation of the structure in response to the fluid flow.
Here are some practical examples of FSI:
- Aircraft Wing Flexibility: The interaction between the airflow and the flexible wing of an aircraft affects its aerodynamic performance. FSI simulations help analyze the structural deformation and its impact on lift, drag, and stability.
- Bridge and Dam Analysis: Fluid flow around bridges and dams can induce vibrations, oscillations, and even structural damage. FSI simulations assist in understanding the fluid-induced forces and their effects on the structural integrity and stability of these infrastructures.
- Blood Flow in Arteries: The interaction between blood flow and arterial walls is crucial in understanding cardiovascular diseases. FSI simulations aid in studying the impact of blood flow patterns, pressure distribution, and wall deformation on the development of diseases like atherosclerosis.
- Wind Turbine Design: The interaction between wind and turbine blades affects their performance and structural integrity. FSI simulations help optimize turbine designs, considering factors such as aerodynamic efficiency, fatigue life, and vibration response.
- Ocean and Offshore Engineering: FSI is crucial in analyzing the behavior of offshore structures, such as platforms and floating wind turbines, under wave and current loads. It helps examine the dynamic response, fatigue life, and safety of these structures.
- Heart Valve Function: FSI simulations are used to study the functioning of heart valves, considering the fluid flow through the valve and its impact on the valve leaflet motion, stresses, and strains. This aids in evaluating valve performance and designing improved prosthetic valves.
Workshop 1: FSI simulation on the Aluminum body with flexible tail
Fluid-structure interaction (FSI) refers to the interaction between a movable or deformable structure and the fluid flow that surrounds it or is contained within it. These interactions can either be stable or oscillatory. In oscillatory interactions, the strain exerted on the solid structure causes it to move in a way that reduces the strain, returning the structure to its original state before the process repeats. Considering fluid-structure interactions is crucial when designing various engineering systems, such as aircraft, spacecraft, engines, and bridges. Neglecting the effects of oscillatory interactions can have catastrophic consequences, particularly in structures made of materials prone to fatigue. In this video, an FSI simulation was conducted on an aluminum body with a flexible tail to study these interactions.
Workshop 2: Blood and vessel FSI simulation using Abaqus-Co Simulation process
This tutorial focuses on studying the Fluid-Structure Interaction (FSI) simulation of blood and vessels using the Abaqus-Co Simulation process. Hemodynamic factors, such as pressure, flow rate, and shear stress, have been identified as crucial contributors to vascular diseases like atherosclerosis and aneurysms. Recent advancements in medical imaging techniques, including magnetic resonance imaging (MRI) and computed tomography (CT), offer detailed anatomical information about the vasculature. Utilizing computational fluid dynamics (CFD), blood flow simulation provides a unique approach to quantifying hemodynamics with high spatial and temporal resolution. While earlier studies used simplified geometric models for blood flow simulations, recent research predominantly employs image-based, subject-specific models. The tutorial employs three-dimensional parts representing the blood and vessels for the simulation.
The simulation of blood flow was conducted using Abaqus CFD, employing flow steps and assigning inlet and outlet boundary conditions. The vessel part was assigned as the boundary in the standard module. It is essential to ensure that the mesh used in both analyses is identical, as the mesh quality significantly impacts the accuracy of the results. Following the simulation, it becomes possible to obtain the stress and displacement of the vessel, derived from the CFD analysis, as well as the pressure and velocity of the blood flow influenced by the vessel’s effects.
Workshop 3: Simulation of air velocity effect over a short column using FSI analysis
This video showcases a simulation of fluid-structure interaction using ABAQUS. ABAQUS is capable of performing FSI analysis and establishing an appropriate coupling between computational fluid dynamics (CFD) and standard analysis. The simulation focuses on examining the impact of air velocity on a short column. The CFD section is responsible for creating the air domain, where properties such as density and viscosity are defined. On the other hand, the Standard section is responsible for creating the column using steel material with elastic properties assigned to it. To ensure proper interaction between the two models, fluid-structure interaction is employed. Changes in velocity and pressure in the CFD section are correlated with stress and displacement in the Standard section.
These examples demonstrate the wide applicability of FSI simulations in various industries, where understanding the interaction between fluids and structures is essential for design, analysis, and optimization purposes.