Prediction of Radiation Forces By Means of a CIP-based Cartesian Grid Method
Prediction of Radiation Forces By Means of a CIP-based Cartesian Grid Method
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发表时间：
2011
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通讯作者：
G. He;T. Isshiki;M. Kashiwagi;Changhong Hu
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作者：
G. He;T. Isshiki;M. Kashiwagi;Changhong Hu
为了预测强非线性水动力现象，提出了一种基于cip的笛卡尔网格方法，并通过与绿水冲击引起的局部压力和船首周围流动的实测时间序列进行比较，验证了该方法的有效性。然而，辐射问题中的附加质量和阻尼系数等水动力尚未得到验证。最近，我们用新造的仪器进行了纵摇和垂摇的受迫振动试验，提供了可靠的辐射力数据。在此基础上，利用基于cip的笛卡尔网格方法，将这些数据与数值计算结果进行了比较，并对结果进行了分析和讨论。最后讨论了数值结果的准确性，并提出了进一步发展的方向。
For the purpose of predicting strongly nonlinear hydrodynamic phenomena, a CIP-based Cartesian grid method has been developed and validated through a comparison with measured time series of the local pressure induced by the green-water impact and observed flows around the ship’s bow. However, hydrodynamic forces such as the added-mass and damping coecients in the radiation problem have not been validated. Recently we carried out the forced oscillation tests in heave and pitch using a newly-constructed apparatus, which provided reliable data on the radiation forces. Thus a comparison is made between these data and numerically computed results by means of a CIP-based Cartesian grid method, the results are analyzed and discussed. And the accuracy of numerical result, and further development to be done are discussed at the end of the paper.