*7.1.2 Mathematical model*

The primary model to be set up is the turbulence model. **SST k-omega** was used for this chapter. There are multiple turbulence models in **Fluent**, each with pros and cons. The next step is to choose the fluid properties (air was selected). Then one needs to set the cell-zone conditions. Here, the rotational frame of reference must be set. The speed of rotation of the frame is the speed of blade rotation. For multiple simulations, this will take on multiple values. For TSR of 7, it is 2.42 rad/sec.

### *7.1.3 Boundary conditions*

Here, we set the boundary values; the inlet wind velocity is set as 12 m/sec along the z-axis. The fluid was selected to be air. The outlet was set to have a constant atmospheric pressure of 1 atm. **Fluent** uses the gauge pressure system, where the values are computed at the center-point of 1 atm. This system improves the floating point accuracy. Period 1 and period 2 were set as interfaces. The blade itself was set as a wall with no-slip condition.
