The cambered deflectors in aquacultural facilities are applied to enhance hydrodynamic efficiencies or enable flow fields to be fully developed. Given the anticipated improvements with the bio-inspired profiles or tandem configurations, the hydrodynamics of cambered deflectors with the above features are investigated at $Re=1\times {10}^5$. The relationship between force coefficients and local flow behaviors for both bionic and non-bionic isolated deflectors, as well as tandem deflectors, is revealed using $k-\omega$ SST simulation. The dependencies of force coefficients on gap (G), stagger (S), and inclination angles ($\theta$) in tandem deflectors are illustrated using an updated metamodeling workflow with simulated data. It is demonstrated that the variations of force coefficients over angles of attack are related to flow physics in boundary-layer regions. The non-bionic isolated deflector with the $\theta ={10}^{\circ }$ prevails as the decent performances of $C_L$ and $\gamma$ globally, which is chosen in the following studies. Regarding tandem deflectors, $\theta$ plays a more vital role in drag coefficients ($C_D$) and lift coefficients ($C_L$), while the influence of S is not quite considerable compared to G. Aiming for cost minimizations and lift improvements, an optimized tandem case is obtained and justified with the superiorities in flow fields. This study has provided novel insights into the designs and optimizations of cambered deflectors in aquacultural engineering.

In this study, we investigated the characteristics of near-field turbulence generated by polyethylene terephthalate net panels using particle image velocimetry measurements across varying twine diameters and net solidities. Within close proximity of the wake (x/L1, whereas pronounced velocity deficits formed behind the twines (U/U0<1). These two regimes progressively converged downstream as shear-layer entrainment and turbulent mixing enhanced wake interactions, yielding a unified global wake. Increasing net solidity was associated with stronger blockage, higher peak jet velocity through the meshes, deeper velocity deficit behind the twines, and an upstream shift of the resolved turbulence-intensity peak. In the decay region downstream from the twines, turbulence intensity followed a power-law decay with fitted exponents generally increasing with net solidity, but remaining below unity, indicating slower decay than canonical high-solidity grids. The near field (x/L<10) was markedly inhomogeneous and anisotropic, and higher-order statistics revealed non-Gaussian behavior. In particular, streamwise skewness responded differently in mesh and twine regions, consistent with a transition from jet-driven acceleration at low net solidity to shear-layer separation and vortex shedding at higher net solidity. Vorticity analysis showed that reducing the twine diameter weakened the vorticity magnitude and shortened the vortex development length because of a weaker bluff-body effect. Consistent trends were observed in the velocity spectra. Transport through the mesh was dominated by rapid downstream advection, while the twine wakes enhanced mixing and increased the particle residence times.