## 3 Results and Discussion
### Flow Behavior
The most effective variants are \(S_{C}^{2m}\), \(S_{C}^{3m}\), \(S_{A}\), and \(S_{W}^{3m}\), with the \(S_{W}^{3m}\) setup showing the best results in terms of reducing the recirculation zone, significantly increasing wave height while achieving the lowest \(\Psi_{z}\) value and only a minor drawback in \(\Psi_{x}\). Some general flow features occur independently of the wave module settings, geometric variants or the visualized section. The as-is state, which shows the flow pattern without the usage of a baffle, is visualized in Figure 8(A1-A3). The water accelerates on the wave module and forms a jet, which is directed into the lower water level. After the wave crest (i.e., highest point of the wave), the jet re-enters the water, lowering to the ground and losing velocity. The jet flows along the inlay downstream and spreads out over the entire height of the water. Under the wave crest, a large vortex arises, stabilizing the wave height. The recirculation zone is localized from the point where the water jet re-enters the water until the jet is fully spread out [Figure 8(A1-A3)]. The re-entering process also introduces air into the system. The air bubbles are carried by the current and rise to the water surface, resulting in an upward movement (y direction) in the recirculation zone. Additionally, the re-entering process generates vortices that follow the current along the border of the reflux and the jet on the ground, mostly dissolving at the water surface. In the default simulation \(S_{D}\), we observed that the velocity within the recirculation zone decreases progressively from the land section [Figure 8(A1)] over the center section [Figure 8(A2)] to the island section [Figure 8(A3)]. In comparison, Figure 8(B1-B3) illustrates the influence of a baffle on the flow behavior and the recirculation zone, placed at a distance of 2 m on the inlay. The \(S_{C}^{2m}\) simulation demonstrates that the recirculation zone is significantly affected by the presence of the baffle. The jet is deflected upwards (y direction), reducing the formation of the recirculation zone in all sections. As a result, the recirculation area is shortened to approximately 2 to 3 m. Temporally, in the island section [Figure 8(B3)], the vortices tend to dissolve [Figure 8(B1)], whereas in the land section, the vortices often rise from the ground and remain in their current position. Despite fluctuations, meaning that the smaller recirculation areas detach regularly, the overall wave stability in the \(S_{C}^{2m}\) simulation is maintained. The wave height is comparable across different sections. From the \(S_{C}^{3m}\) simulation, as shown in Figure 8(C1-C3), it is evident that the size of the recirculation zone is directly dependent on the position of the baffle. In simulations \(S_{C}^{2m}\) and \(S_{C}^{3m}\), the baffle is installed after the impact point of the re-entering water jet on the inlay, redirecting the flow and minimizing the recirculation zone. The closer the baffle is to the impact point, the earlier the jet spreads into the water, further reducing the recirculation zone. The temporal behavior differs significantly between simulations \(S_{C}^{2m}\) and \(S_{C}^{3m}\). Simulation \(S_{C}^{2m}\) exhibits vortices forming behind the baffles, which grow, detach, and dissolve in the current. In contrast, simulation \(S_{C}^{3m}\) shows different characteristics across different sections. The land section [Figure 8(C1)]forms a large and stable vortex behind the baffle, resulting in a unique water surface shape due to jet redirection. The center section [Figure 8(C2)] behaves similarly to simulation \(S_{\text{C}}^{2m}\), while the island section [Figure 8(C3)] sporadically shows vortices, with cross-sectional currents dominating and preventing vortex formation. Overall, the flow field in simulation \(S_{\text{C}}^{3m}\) is more stable over time, whereas the flow field in \(S_{\text{C}}^{2m}\) fluctuates constantly.