Item description

Air flow simulation in H-Type vertical axis turbine

The vertical axis wind turbines, called VAWT (or Vertical Axis Wind Turbines), are located vertically. The most important advantage of vertical wind turbines is that there is no need to adjust the orientation to the direction of the wind, and they can also be used at low altitude.

In turbines or vertical axis rotors, the axis of rotation is perpendicular to the ground and the blades rotate parallel to the ground. because of this, the surface that is driven by the wind will have to move in the direction of the flow of the wind after half a turn and this will reduce their power factor. For this reason, the curve of the blade is so important in these rotors.

In this analysis, the air flow around the H-Type vertical axis turbine has been simulated and analyzed using Ansys Fluent software.

Geometry and Mesh

The geometry required for this analysis was generated by Ansys Design Modeler software. The meshing required for this analysis was also generated by Ansys Meshing software. The mesh type used in this analysis is unstructured. The total number of cells produced for this geometry is 2169176 cells.

Model

In this analysis, the Viscosity Model K-epsilon RNG has been used to check the fluid flow. The Standard Wall function is also used near the wall. In this analysis, in order to model the rotation, the Mesh Motion (MRF) method in the Cell Zone condition has been used, with the velocity of 14.17 rad/s.

Boundary Condition

The airflow inlet is defined as Velocity Inlet, and its value is equal to 5.3 m/s. The output flow is defined as pressure outlet and the pressure is equal to 0 Pa in relative terms. The blade walls are also defined as Wall.

Discretization of equations

In this analysis, the SIMPLE algorithm is used to discretize the velocity and pressure equations. The flow equation is also discretized as Second Order Upwind.

The results are presented as velocity contours as well as streamlines.

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