有流动分离的非对称物体垂直入水的二维解析模型
A two-dimensional analytical model of vertical water entry for asymmetric bodies with flow separation
摘要：
考虑了非对称二维物体垂直入水时的分离流动。只要没有流动分离，线性化的Wagner理论与修正的Logvinovich模型相结合，已被证明可以在入水过程中提供计算快速和可靠的砰击载荷估计。Tassin等人（2014年）引入了Fictionary Body Continuation（FBC）概念，作为将Wagner模型的使用扩展到分离流配置的一种方式，但他们只考虑对称体。在本研究中，我们调查的能力，FBC的概念，提供准确的估计砰击载荷的非对称机构。在这种情况下，流动分离可能不会同时发生在主体的两侧。在中间阶段，砰击载荷由局部流分离引起的局部压降和润湿面积的持续膨胀之间的竞争决定。作为该模型的第一个基准，我们考虑了一个倾斜的平板的水进入和比较FBC估计与非线性模型的结果。然后，我们考虑的情况下，箔和比较FBC的结果与计算流体动力学的预测。在这两种情况下，我们发现，FBC模型是能够提供可靠的估计砰击载荷。
英文摘要：
The vertical water entry of asymmetric two-dimensional bodies with flow separation is considered. As long as there is no flow separation, linearised Wagner's theory combined with the Modified Logvinovich Model has been shown to provide computationally fast and reliable estimates of slamming loads during water entry. Tassin et al. (2014) introduced the Fictitious Body Continuation (FBC) concept as a way to extend the use of Wagner's model to separated flow configurations, but they only considered symmetric bodies. In the present study, we investigate the ability of the FBC concept to provide accurate estimates of slamming loads for asymmetric bodies. In this case, flow separation may not occur simultaneously on both sides of the body. During an intermediate phase, slamming loads are governed by a competition between the local drop in pressure due to partial flow separation and the ongoing expansion of the wetted area. As a first benchmark for the model, we consider the water entry of an inclined flat plate and compare the FBC estimates with the results of a nonlinear model. Then, we consider the case of a foil and compare the FBC results with Computational Fluid Dynamics predictions. In both cases, we find that the FBC model is able to provide reliable estimates of the slamming loads.
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