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Re-Entrant Jet Modelling for Partially Cavitating Two-Dimensional Hydrofoils

机译:部分空化二维水翼的重入射流建模

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摘要

The computational analysis of partial sheet hydrofoilcavitation in two dimensions is performed. Particular attention is given to the method of simulating the flow at the end of the cavity. A fixed-length partiallycavitating panel method is used to predict the height of the re-entrant jet, using the values of the cavitation number and the drag coefficient. The jet surface is subsequently constructed and included in an updated cavityshape. A source singularity is introduced in the fluid domain to account for the mass flux through the part of the domain boundary represented by the re-entrant jet surface. Further iterations are performed for fixed cavitation number on the cavity with a re-entrant jet cavity termination model. This model is seen to produce good results and displays quick convergence. A validation is accomplished by conducting a parametric analysis of the model and comparing the present calculations with other numerical schemes. The flow around the partially cavitating hydrofoil with a re-entrant jet has also been treated with a viscous/inviscid interactive method withfavourable results.
机译:对二维薄板水翼空化进行了二维计算分析。特别注意模拟腔体末端流动的方法。使用定长的部分空化面板方法,使用空化数和阻力系数的值来预测折返射流的高度。随后构造喷射表面并将其包括在更新的空腔形状中。在流体域中引入了源奇异性,以说明通过重入射流表面表示的通过域边界部分的质量通量。使用凹状喷射腔终止模型,对腔上的固定气穴数执行进一步的迭代。可以看到此模型产生了良好的结果并显示出快速收敛。通过对模型进行参数分析并将当前计算结果与其他数值方案进行比较来完成验证。还使用粘性/无粘性相互作用方法处理了带有凹入射流的部分空化水翼周围的流动。

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