## 3 Results  
### Experimental Results  
Tables 6-9 show the values of the aerodynamic forces and moments that were obtained from the experimental tests on the truss models discussed in the previous sections. Tables 6-9 also present the particular wind speed and turbulent intensity for each measurement. The experimental tests were performed with a \"quasi-laminar\" flow, where the average turbulent intensity was equal to \(\mathrm{I_{v}}=3\%\); for tests using turbulent airflow, the average turbulent intensity was \(\mathrm{I_{v}}=9\%\) and \(12\%\) for the tower truss and jib truss models, respectively. In all investigated cases, the nominal wind speed was equal to \(\mathrm{V}=15\) m/s. Moreover, it was assumed that the wind direction varied from \(0^{\circ}\) to \(180^{\circ}\) with a step of \(15^{\circ}\). Figures 15-18 show the profiles of the measured wind speed as a function of time. In the case of \"quasi-laminar\" flow, the wind speed did not change significantly. However, in turbulent flow, the wind speed varied considerably. Thus, in this case, precise wind measurements should be considered quite problematic. \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Angle \(\mathbf{\beta}\) (\({}^{\circ}\))** & \(\mathbf{F_{X}}\) (N) & \(\mathbf{F_{Y}}\) (N) & \(\mathbf{M_{Z}}\) (Nm) \\ \hline
0 & 6.086 & \(-0.832\) & 0.277 \\
15 & 7.061 & \(-0.034\) & 0.245 \\
30 & 7.682 & \(-0.418\) & 0.310 \\
45 & 7.711 & \(-0.654\) & 0.391 \\
60 & 7.593 & \(-0.595\) & 0.457 \\
75 & 6.854 & \(-0.832\) & 0.457 \\
90 & 6.234 & 0.143 & 0.391 \\
105 & 7.357 & 0.468 & 0.261 \\
120 & 8.420 & 0.409 & 0.408 \\
135 & 8.952 & 0.025 & 0.408 \\
150 & 8.568 & \(-0.418\) & 0.440 \\
165 & 7.475 & \(-0.595\) & 0.408 \\
180 & 6.618 & \(-0.093\) & 0.310 \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Experimental results obtained for tower truss model with “quasi-laminar” airflow. \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Cell Size (mm)** & \(\mathbf{F_{X}}\) (N) & \(\mathbf{F_{Y}}\) (N) & \(\mathbf{M_{Z}}\) (Nm) & \(\mathbf{C_{X}}\) & \(\mathbf{C_{Y}}\) & \(\mathbf{C_{M_{Z}}}\) & **Number of Iter** \\ \hline
1.000 & 7.765 & 0.083 & 0.015 & 2.628 & 0.028 & 0.009 & 609 \({}^{*}\) \\
1.500 & 7.748 & 0.088 & 0.017 & 2.622 & 0.030 & 0.010 & 48 \\
2.000 & 7.808 & 0.059 & 0.018 & 2.643 & 0.020 & 0.011 & 42 \\ \hline \hline \end{tabular} \({}^{*}\)Solution not convergent due to continuity criterion.  
\end{table} 
Table 4: The values of the aerodynamic forces and corresponding coefficients for different mesh sizes. Wind speed V = 15 m/s, turbulent intensity \(\mathrm{I_{v}}=9\%\). \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Cell Size (mm)** & **Faces (Truss \({}^{*}\))** & **Nodes** & **Cells** \\ \hline
1.000 & 17,458,489 (317,697) & 12,446,064 & 3,088,976 \\
1.500 & 9,977,802 (160,973) & 7,076,642 & 1,775,847 \\
2.000 & 6,854,749 (92,731) & 4,859,870 & 1,219,894 \\ \hline \hline \end{tabular} \({}^{*}\)The number of faces generated on the truss surface.  
\end{table} 
Table 5: Total number of cells, faces, and nodes. \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Angle \(\beta\) (\({}^{\circ}\))** & \(\mathbf{F_{X}}\) **(N)** & \(\mathbf{F_{Y}}\) **(N)** & \(\mathbf{M_{Z}}\) **(Nm)** \\ \hline
0 & 8.420 & \(-\)1.009 & 0.261 \\
15 & 9.306 & \(-\)0.743 & 0.245 \\
30 & 10.370 & \(-\)1.245 & 0.326 \\
45 & 10.577 & \(-\)1.482 & 0.408 \\
60 & 10.104 & \(-\)1.275 & 0.424 \\
75 & 8.716 & \(-\)1.600 & 0.440 \\
90 & 8.184 & \(-\)1.157 & 0.408 \\
105 & 8.834 & \(-\)0.507 & 0.391 \\
120 & 9.809 & \(-\)0.861 & 0.457 \\
135 & 9.041 & \(-\)0.684 & 0.473 \\
150 & 9.306 & \(-\)1.245 & 0.522 \\
165 & 8.243 & \(-\)1.304 & 0.489 \\
180 & 7.091 & \(-\)0.891 & 0.359 \\ \hline \hline \end{tabular}
\end{table} 
Table 7: Experimental results obtained for tower truss model with turbulent airflow.