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Numerical investigation of the fall rate of a sea-monitoring probe

机译：海洋监测探头坠落率的数值研究

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The errors in expendable BathyThermograph (XBT) fall rate equations are demonstrated to be responsible for a time-varying warm bias in the global ocean temperature by many investigators. In this paper, a numerical model based on the Reynolds averaged Navier-Stokes (RANS) equations and the equation of motion for rigid body has been applied to investigate the fall rate of a sea-monitoring probe. The free surface and its interaction with the probe were simulated by the Volume of fluids (VOF) method, and the movement of the probe was tracked using Newmark's integration. The numerical model has been validated against experimental data of water entry of a sphere. Following the validation, the model was applied to simulate whole descending process of probe after it was released from surface, and time histories of displacement and velocity were obtained. Results indicated that drop height and mass reduction (due to wire payout) have a great influence on the fall rate and terminal velocity of the probe. Factors affecting the terminal velocity of the probe were also discussed.
机译：许多研究人员证明，消耗性的BathyThermograph（XBT）下降速率方程式中的误差是造成全球海洋温度随时间变化的温暖偏差的原因。在本文中，基于雷诺平均Navier-Stokes（RANS）方程和刚体运动方程的数值模型已被用于研究海洋监测探测器的下降率。通过流体体积（VOF）方法模拟自由表面及其与探针的相互作用，并使用Newmark积分跟踪探针的运动。该数值模型已经针对球体入水的实验数据进行了验证。验证之后，该模型被用于模拟探针从表面释放后的整个下降过程，并获得了位移和速度的时间历程。结果表明，跌落高度和质量降低（归因于导线放出）对探头的下降速度和终端速度有很大影响。还讨论了影响探针终端速度的因素。

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