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FSI Method Application for Water Turbine CFD Simulation

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A turbine is a rotating mechanical device that takes energy from the fluid flow and converts it.


This product includes CFD simulation files and a training movie using ANSYS Fluent software.

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FSI Problem Description

The present study investigates the water flow around a vertical water-turbine considering unsteady CFD simulation. In the present case, it is assumed that the turbine blades are affected by the flow of the passing fluid; that is, the fluid flowing through the turbine blades impedes forces on the turbine body and these forces cause deformation or resizing of the body of these blades. Therefore, the present problem consists of two fluid and solid solutions at the same time and hence, the FSI method and the coupling between the fluid flow and the Transient Structural are used. Also, the moving mesh technique should be applied to make instantaneous changes to the mesh structure.

Assumptions for Water Turbine Simulation

Simulation is Transient and the solver is pressure-Based. Also, the gravity force effect is ignored.

Geometry & Mesh of the Water Turbine

The present 3-D model was designed by Design Modeler software. The geometry of the model consists of a large cubic space as a fluid domain and the water turbine inside this space as a solid domain. The unstructured mesh was carried out by ANSYS Meshing software. The element number is 523202.

CFD Simulation

Here is a summary of the steps to define and solve the problem in the table:

k-epsilon Viscous model
standard k-epsilon model
standard wall function near wall treatment
Dynamic mesh
smoothing and remeshing mesh methods
system coupling dynamic mesh zone
Boundary conditions for FSI CFD simulation
velocity-inlet Inlet
1.5 m.s-1 velocity magnitude
pressure-outlet Outlet
0 Pa gauge pressure
wall Walls type
stationary walls blades and fixed walls
Solution Methods for FSI simulation
Simple   Pressure-velocity coupling
second order upwind pressure Spatial discretization
second order upwind momentum
first order upwind turbulent kinetic energy
first order upwind turbulent dissipation rate
Initialization (FSI)
Standard Initialization method
1.5 m.s-1 x-velocity


All files, including Geometry, Mesh, Case & Data, are available in Simulation File. By the way, Training File presents how to solve the problem and extract all desired results.



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