Fluid Structure Interaction (FSI)

What is Fluid-Structure Interaction (FSI)?

Fluid-structure interaction (FSI) is a multiphysics coupling between the laws that describe fluid dynamics and structural mechanics. This phenomenon is characterized by interactions – which can be stable or oscillatory – between a deformable or moving structure and a surrounding or internal fluid flow. When a fluid flow encounters a structure, stresses and strains are exerted on the solid object – forces that can lead to deformations. These deformations can be quite large or very small, depending on the pressure and velocity of the flow and the material properties of the actual structure. Suppose the structure’s deformations are quite small and the variations in time are also relatively slow. In that case, the deformation will not greatly affect the fluid’s behavior, and we can concern ourselves with only the resultant stresses in the solid parts. However, if the variations in time are fast, greater than a few cycles per second, then even small structural deformations will lead to pressure waves in the fluid. These pressure waves lead to the radiation of sound from vibrating structures. Such problems can be treated as an acoustic-structure interaction rather than a fluid-structure interaction. Yet, if the deformations of the structure are large, the velocity and pressure fields of the fluid will change as a result, and we need to treat the problem as a bidirectionally coupled multiphysics analysis: The fluid flow and pressure fields affect the structural deformations, and the structural deformations affect the flow and pressure.



MR-CFD, an expert in the field of FSI simulations

One of the most important applications of ANSYS software is simultaneously analyzing fluids and solids. This software allows us to use fluid-structure interactions to establish the relationship between fluid analysis and solid analysis and investigate how the structure and fluid interact. The mentioned process above is done by coupling Fluent software with transient structural using the system coupling option in ANSYS.

With several years of experience simulating a wide range of problems in various CFD fields using Fluent software, the MR-CFD team is ready to offer extensive modeling, meshing, and simulation services. Simulation Services for FSI are categorized as follows:

  • simulation of stress and strain analysis of blood vessel in variable blood velocity
  • Predicting final deflection and fluctuation of high altitude and skyscraper
  • Human heart stress analysis while pumping blood in a human vessel
  • Generating power from sea waves on the beach using a flexible structure
  • Stress and stress analysis of tidal turbine in submerged and submerged situation
  • Airplane wing fluttering in turbulence fluid flow
  • The fluctuation of structure in vortex shedding region

You may find the related products in the categories mentioned above in our CFD shop by clicking on the following link:


Our services are not limited to the mentioned subjects, and the MR-CFD team is ready to undertake different and challenging projects ordered by our customers. You can consult with our experts freely and without charge at first, and then order your project by sending the problem details to us using the following address.

[email protected]

By entrusting your project to the MR-CFD team, you will not only receive the related project’s files (Geometry, Mesh, Fluent files). Also, you will be provided with an extensive tutorial video demonstrating how you can create the geometry, mesh, and define the needed settings in the Fluent software all by yourself. And these all come with post-technical support from the MR-CFD team.

MR-CFD experts are ready to fulfill every Computational Fluid Dynamic (CFD) needs. Our service includes industrial and academic purposes considering various CFD problems. MR-CFD serves three main categories: ANSYS Fluent Consultation, ANSYS Fluent Training, and ANSYS Fluent Project Simulation. MR-CFD company has gathered experts from various engineering fields to ensure the quality of CFD services. Your CFD project would be done in the shortest time, with the highest quality and reasonable cost.


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