波浪能作为绿色可再生能源，是中国实现碳中和目标不可忽视的组成部分，同时也可为能源转型作出贡献。然而，近岸沿海地区的波浪能量密度较低，布放于此的波浪能发电装置的效率也较低。使用抛物线型波能汇聚装置能够将波浪能量聚焦到特定区域，从而显著增加可用的波浪能量以供波浪能转换装置俘获利用。该文通过数值模拟和物理模型实验，分析了不同波浪周期下抛物线型波能汇聚装置的焦距变化对波浪能量聚集的影响。研究发现，波能聚焦位置围绕理论焦点随波浪周期循环往复移动，波能聚焦区域以理论焦点为中心沿弦长方向对称分布。随着焦距的减小与入射波浪周期的缩短，理论焦点位置的波能聚焦效果愈发优异。

Objective: Ocean wave energy is an indispensable part of China's efforts to achieve carbon neutrality and contribute to the energy transition as a green renewable energy. However, the wave energy density in the coastal area is low, and the efficiency of wave energy converters placed there is also low. By optimizing the structural form and spatial layout of the WEC, or optimizing the parameters of the energy conversion system, the efficiency can be improved, but to a limited extent. In order to increase the wave energy captured by the WEC at the source, a parabolic wave energy focusing device is proposed, and the parabolic wave energy focusing device can concentrate wave energy into a certain area. The concentrated energy characteristics of parabolic wave energy focusing device are investigated, the suggestions and references for the integration of the device and WEC also provided. Methods: The concentrated energy characteristics of parabolic wave energy focusing device are investigated through physical model experiments and numerical simulation, and the influence of the focal distance change of parabolic wave energy focusing device on the focusing effect of wave energy is analyzed under different wave period conditions. The Boussinesq equation with improved dispersive characteristics is used to simulate the waves, and the cut-cell technique is used to solve the Boussinesq equations with complex structural boundaries. The Boussinesq equation is solved by an explicit second-order MUSCL-Hancock Godunov-type finite volume scheme, and the HLLC approximate Riemann solver is used to evaluate interface fluxes. The physical experiments were conducted in the 24-meter-wide wave basin at the State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, China. The chord length l, and the focal length, L_f, of the parabolic wave energy focusing device, were 18 and 4.22 m, respectively. Results: The numerical simulation results are consistent with the physical experimental results. All the results showed that: 1) With the change of focal distance and incident wave period, the wave energy focusing point reciprocate periodically around the theoretical focal point; 2) When the ratio of focal distance to half wavelength is approximately an integer multiple, the wave energy focusing point coincides with the theoretical focal point; 3) The smaller the focal distance or the shorter the wave period, the better the wave energy focusing effect at theoretical focal point; 4) The wave energy focusing area is symmetrically distributed along the chord length with the theoretical focal point as the center, and with the decrease of the focal distance, the wave energy focusing effect on the side of the wave incident direction is gradually weakened. Conclusions: By physical model experiment and numerical simulation, the concentrated energy characteristics of parabolic wave energy focusing device are investigated. The parabolic wave energy focusing device can concentrate wave energy into a certain area, and significantly increase the wave energy captured by the WEC. Thus, the efficiency of the wave energy converters can be improved.