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首页> 外文期刊>Fluids >Numerical Flow Characterization around a Type 209 Submarine Using OpenFOAM
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Numerical Flow Characterization around a Type 209 Submarine Using OpenFOAM

机译：使用OpenFoam的209型潜艇周围的数值流量表征

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The safety of underwater operation depends on the accuracy of its speed logs which depends on the location of its probe and the calibration thoroughness. Thus, probes are placed in areas where the flow of water is smooth, continuous, without high velocity gradients, air bubbles, or vortical structures. In the present work, the flow around two different submarines is numerically described in deep-water and near-surface conditions to identify hull zones where probes could be installed. First, the numerical setup of a multiphase solver supplied with OpenFOAM v7 was verified and validated using the DARPA SUBOFF-5470 submarine at scaled model including the hull and sail configuration at H/D=5.4 and Fr=0.466. Later, the grid sensitivity of the resistance was assessed for the full-scale Type 209/1300 submarine at H/D=0.347 and Fr=0.194. Free-surface effect on resistance and flow characteristics was evaluated by comparing different operational conditions. Results shows that the bow and near free-surface regions should be avoided due to high flow velocity gradient, pressure fluctuations, and large turbulent vortical structures. Moreover, free-surface effect is stronger close to the bow nose. In conclusion, the probe could be installed in the acceleration region where the local flow velocity is 15% higher than the navigation speed at surface condition. A 4% correction factor should be applied to the probe readings to compensate free-surface effect.
机译：水下操作的安全性取决于其速度日志的准确性，这取决于其探头的位置和校准良好。因此，将探针放置在水流平滑，连续的区域，而没有高速梯度，气泡或涡流结构。在本作的工作中，在深水和近表面条件下进行两种不同潜艇周围的流动以识别可以安装探针的船体区域。首先，使用DARPA Suboff-5470潜艇（包括H / D = 5.4和FR = 0.466）的DARPA Suboff-5470潜艇验证并验证了使用OpenFoam V7提供的多相求解器的数值设置。后来，在H / D = 0.347和FR = 0.194中评估抗性的电阻血缘敏感性。通过比较不同的操作条件，评价对抗性和流动特性的自由表面效应。结果表明，由于高流速梯度，压力波动和大的湍流涡流结构，应避免弓和近自由表面区域。此外，自由表面效果靠近弓形鼻子。总之，探针可以安装在加速区域中，其中局部流速比在表面条件下的导航速度高15％。应将4％的校正因子应用于探针读数以补偿自由表面效果。

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