De Tavernier (2022)
This test is a veriication of the implementation of the DMST algorithm in Ashes. It compares the results produced by Ashes with those published in De Tavernier et al. (2022).
1 Test description
This test uses a simple 2-bladed VAWT in constant wind and checks the aerodynamic loads on the blades. The results presented in De Tavernier et al. (2022) apply to a 2D aerodynamical blade station.
2 Model
This test uses the RMA only - vertical axis - 2B template
The CSV file to run this test can be downloaded from here.
The model is illustrated in the figure below:
The characteristics of the 2D blade element are as follows, as defined in De Tavernier et al. (2022):
- radius
$$r = 1\text{ m}$$
- chordlength
$$c = 0.1\text{ m}$$
- number of blades
$$B = 2$$
- incoming wind speed
$$V = 1\text{ m}\cdot\text{s}^{-1}$$
- constant rotational speed
- lift coefficient
$$\omega = 3\text{ rad}\cdot\text{s}^{-1}=28.65\text{ RPM}$$
- lift coefficient
$$C_L = 2\pi\sin(\alpha)$$
where $$\alpha$$
is the angle of attack - drag coefficient
$$C_D=0$$
The blades in Ashes are 2 meters long. The test is run in Loads only so that the rotational speed is not affected by the aerodynamic loads and no controller is required.
3 Benchmarked solution
The results from De Tavernier et al. (2022) that are used to verify the results from Ashes is the Angle of attack, the Relative wind speed and the Distributed torque force from the Blade aerodynamical station sensor.
4 Results
The results are visually checked. The report showing the comparison between Ashes and the benchmark can be found here:
A regression test is also run nightly to ensure that any potential difference between the results from Ashes and the benchmar is picked up immediately. The report showing the results from the rgeresion tests can be found here: