Fluid Structure Interaction (FSI)

MR-CFD experts are ready for FSI analysis, consulting, training, and CFD simulation.

Fluid-structure interactionAircraft wing fluttering

Fluid-structure interaction is the science of investigating fluid flows interacting with structures. And the occurred phenomena in the interaction. Moreover, Fluid-structure interaction (FSI) has a wide range of applications in many engineering systems.

We use the FSI model just for cases that fluid and solid behavior are completely coupled and the reason for stress in a structure depends on pressure distribution of fluid flow behavior. If pressure distribution around solid structural is uniform and by changing deflection is constant and is independent to fluid flow behavior, we do not suggest use FSI model because the complexity and computational cost of FSI simulation are higher than fluid flow analysis or structural analysis. Even some times is higher than the sum of total computational cost. So we suggest simulating the project by the FSI model just in non-uniform pressure distribution (based on fluid flow behavior) and in cases that by changing deflection pressure distribution will be changed.Mr CFD

There are two methods for solving the FSI problem. One way and two way. In one way method, CFD solver software (ANSYS Fluent) steadily predict pressure distribution around solid structure and this pressure distribution will transfer to structural analysis software (ANSYS static structural) and based on this, stress distribution and in consequence final strain and deflection of structure will be predicted. This method is appropriate for analysis of fluid flow behavior around building and finding final deflection of building.  However, in the two-way analysis FSI method, the simulation will be done in transient mode and in each time step pressure will transfer to structural software and deflection will transfer to CFD solver. This method will be used in various industrial and aerodynamic application such as wing fluttering and Coriolis flowmeter. Etc.

We are highly experienced in the simulation of FSI problems and we use ANSYS Fluent package for solving this problem. ANSYS Fluent software is used for modeling fluid flow behavior beside, static structural and transient structural is used for modeling and simulating strain and stress analysis. In the following, there is a summary of our FSI project:

  • simulation of stress and strain analysis of blood vessel in variable blood velocityMr CFD
  • 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 wave in beach using 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

For instance, fluid-induced vibration (FIV) which is an FSI problem, is widely encountering in various applications. Such as pipes conveying fluids, cross-flow or parallel flow around solitary cylinders, vibrations related to pressure waves in piping, Surging in compressors, etc.

The phenomena of interaction between fluids and structures may occur in internal and external flow through a complex process. This can happen by numerous factors such as the structure geometry, flow conditions, and fluid properties. Our CFD engineers at Mr CFD Company believe that in order to apply the possible advantages to industry and overcome existing disadvantages, it is necessary to scrutinize effective factors.

Recent developments in the FSI field have provided mathematical and computational requirements for better understanding resulting in more effective CFD simulations. Eventually, the CFD simulations will lead to more efficient mechanical systems and help you improve the design of your systems.wing










One of the most important applications of ANSYS software is the ability to simultaneously analyze fluids and solids. In fact, this software allows us to use fluid-structure interactions to establish the relationship between fluid analysis and solid analysis and to investigate how the structure and fluid interact, which is briefly called FSI. Whenever the purpose of the problem was to investigate the effect of fluid flow on the solid body within the fluid, the above method is used. For example, this method is used to simulate the movement of a water turbine within a water flow and the effect of water flow on the turbine blades.

Transient Structural

In the Analysis Setting section, the time step of the problem solving, the solution time, and the end time of the solution are stated that the time of the solution must be in accordance with the time of solving the fluid problem in Fluent. Then, the boundary of the solid body in the fluid flow can be deduced from the present problem, such as from the Fixed Support constraint to the assumption of walls that are not affected by the fluid flow, and the Fluid-Solid Interface constraint is used for definition of walls that are affected by the change in fluid flow.

System Coupling

To establish the relationship between the results of fluid and structural analysis and their effect on each other, several Data Transfers need to be defined, so that the area of deformation in the Fluid Flow zone as the Source of Force parameter to the same area in the Transient Structural section as the Target, and then the same area in the Transient Structural section as the Source causes a change in Displacement in the Fluid Flow section.


MR-CFD experts are ready to fulfill every Computational Fluid Dynamic (CFD) needs. Our service includes both industrial and academic purposes considering a wide range of CFD problems. MR-CFD services in three main categories of Consultation, Training, and 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 appropriate cost.

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