## 3 Results
### Speed Comparison  
3.2.1. Comparison of Wind Speeds on the Vertical Plane at Y = 0  
Figure 9 shows the contour plots of the X-velocity (\(U\)) at y = 0. Table 4 presents the locations of the contour line at y = 0 (\(U\)). For the contour line of the 0 m/s wind speed in the low-wind-speed area behind the building, the simulated x/b-values were all higher than the value of 1.85 from the wind tunnel experiment. Among them, the x/b-value for the STLKE model was 2.90, which was the closet to the value of 1.85 from the experiment, followed by the RTLKE model. The results of the other three models showed more significant differences compared with the experimental results.  
Figure 8: Schematic diagram of XR and XF.  
\begin{table}
\begin{tabular}{c c c c c c c c c c} \hline  & **SKE** & **STLKE** & **SLRNKE** & **RKE** & **RTLKE** & **AKNKE** & **EBKE** & **V2 FKE** & **Wind Tunnel Experiment** \\ \hline X\({}_{\text{R}}\)/b & — & 0.33 & — & 0.38 & 0.32 & 0.89 & 0.37 & 0.85 & 0.52 \\ \hline X\({}_{\text{F}}\)/b & 2.63 & 2.38 & 2.53 & 3.05 & 2.65 & 3.55 & 3.20 & 4.35 & 1.42 \\ \hline \end{tabular}
\end{table}
Table 3: Calculation results of each turbulence model.  
For the contour line of the 5 m/s wind velocity in the high-wind-speed area above the building, all the turbulence models displayed a similar trend. The simulated z/b-values were all close to the value of 2.90 from the experiment. All the five models showed good performance in predicting flow separation above the building.  
Figure 10 shows the contour plots of the Z-velocity (\(W\)) at Y = 0. Table 5 presents the locations of the contour line at y = 0 (\(W\)). For the contour line of the -0.25 m/s wind speed in the low-wind-speed area behind the building, the simulated z/b-values were all lower  
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline  & **AKNKE** & **EBKE** & **RKE** & **STLKE** & **RTLKE** & **Wind Tunnel Experiment** \\ \hline Location of contour line of 0 m/s & & & & & & \\ in X-direction (low-wind-speed area) & \(>\)3.5 & \(>\)3.5 & \(>\)3.5 & 2.90 & 3.15 & 1.85 \\ \hline Location of contour line of 5 m/s & & & & & & \\ in Z-direction (high-wind-speed area) & 2.65 & 2.72 & 2.78 & 2.83 & 2.80 & 2.90 \\ \hline \hline \end{tabular}
\end{table}
Table 4: Location of contour line at Y = 0 (\(U\)).  
Figure 9: Contour plots of X-velocity (\(U\)) at Y = 0.  
than the value of 1.05 from the wind tunnel experiment. Among them, the z/b-value for the STLKE model was 0.75, which was the closest to the value of 1.05 from the experiment, followed by the RTLKE model. Moreover, the difference between the results from the other three models and of the experiment were rather significant.  
For the contour line of the 0.5 m/s wind speed in the high-wind-speed area above the building, the results from the five turbulence models demonstrated subtle differences  
Figure 10: Contour plots of Z-velocity (\(W\)) at Y = 0.  
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multicolumn{1}{c}{**AKNKE**} & \multicolumn{1}{c}{**EBKE**} & \multicolumn{1}{c}{**RKE**} & \multicolumn{1}{c}{**STLKE**} & \multicolumn{1}{c}{**RTLKE**} & \multicolumn{1}{c}{**Wind Tunnel Experiment**} \\ \hline Location of the contour line of & & & & & & & \\ \(-0.25\) m/s in Z-direction & 0.45 & 0.45 & 0.45 & 0.75 & 0.65 & 1.05 \\ (low-wind-speed area) & & & & & & & \\ \hline Location of the contour line of 0.5 & & & & & & \\ m/s in Z-direction & 2.80 & 2.70 & 2.75 & 2.75 & 2.75 & 2.70 \\ (high-wind-speed area) & & & & & & \\ \hline \hline \end{tabular}
\end{table}
Table 5: Location of contour line at Y = 0 (\(W\)).  
compared with the wind tunnel experiment results, and the five simulated z/b-values were all close to the value of 2.70 from the experiment.