Abstract Predicting the cavitation impact loads on a propeller surface using numerical tools is becoming essential, as the demand for more efficient designs, stretched to the limit, is increasing. One of the possible design limits is governed by cavitation erosion. The accuracy of estimating such loads, using a URANS approach, has been investigated. We follow the energy balance approach by (Schenke and van Terwisga, 2019), (Schenke et al., 2019), where we take account of the focusing of the potential energy into the collapse center before it is radiated as shock wave energy in the domain. In complex flows, satisfying the total energy balance, when reconstructing the radiated energy, has always been an issue in the past. Therefore, in this study, we investigate different considerations for the vapor reduction rate, in order to minimize the numerical errors, when estimating the local surface impact power. We show that when the vapor volume reduction rate is estimated using the mass transfer source term, then all the energy is conserved and the total energy balance is satisfied. The model is verified on a single cavitating bubble collapse, and it is further validated on a model propeller test case. The obtained surface impact distribution agrees well with the experimental paint test results, illustrating the potential for practical use of our fully conservative method to predict cavitation implosion loads on propeller blades.

中文翻译：

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船用螺旋桨空化冲击载荷预测精度研究

摘要 随着对更高效设计的需求不断增加，使用数字工具预测螺旋桨表面上的空化冲击载荷变得至关重要。可能的设计限制之一是由空化侵蚀控制的。已经研究了使用 URANS 方法估计此类负载的准确性。我们遵循 (Schenke and van Terwisga, 2019), (Schenke et al., 2019) 的能量平衡方法，其中我们考虑了势能在它作为冲击波能量辐射到坍塌中心之前的聚焦领域。在复杂的流动中，满足总能量平衡，在重构辐射能量时，一直是过去的一个问题。因此，在这项研究中，我们调查了蒸汽减少率的不同考虑因素，为了最小化数值误差，在估计局部表面冲击功率时。我们表明，当使用传质源项估计蒸汽体积减少率时，所有能量都是守恒的，并且满足总能量平衡。该模型在单个空化气泡坍塌上得到验证，并在模型螺旋桨测试案例上得到进一步验证。获得的表面冲击分布与实验油漆测试结果非常吻合，说明了我们完全保守的方法在实际使用中预测螺旋桨叶片空化内爆载荷的潜力。该模型在单个空化气泡坍塌上得到验证，并在模型螺旋桨测试案例上得到进一步验证。获得的表面冲击分布与实验油漆测试结果非常吻合，说明了我们完全保守的方法在实际使用中预测螺旋桨叶片空化内爆载荷的潜力。该模型在单个空化气泡坍塌上得到验证，并在模型螺旋桨测试案例上得到进一步验证。获得的表面冲击分布与实验油漆测试结果非常吻合，说明了我们完全保守的方法在实际使用中预测螺旋桨叶片空化内爆载荷的潜力。