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Unsteady Cavitation and Cryogenic Flow Cavitation around 2D Body

机译:不稳定的空化和低温流量围绕2D体

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Since the coupling of cavitation modeling with turbulent flow is the difficulty topic, a numerical simulation for two phase flow remains as one of the challenging issues in the society. This research focuses on the development of numerical code to deal with incompressible two phase flow around 2D hydrofoil combined with cavitation model suggested by Kunz et al. with k-氓 turbulent model. The simulation results are compared to experimental data to verify the validity of the developed code. Also, the comparison of the calculation results is made with LES results to evaluate the capability of conventional turbulence models such as k-氓 model. The calculation results show very good agreement with experimental observations even though this code can not grasp the small scaled bubbles in the calculation whereas LES can hold the real physics. Also, the calculation of cavitation in cryogenic fluid was done by implementing the temperature sensitivity in government equations. Even though the results show good agreement with previous calculation results, further research will be needed to account for real physics of the formation of cavitation in cryogenic fluid due to temperature sensitivity. This code will be further extended to 3D compressible two phase flow for the study on the fluid dynamics around inducers and impellers in turbo pump system.
机译:由于空化建模与湍流的耦合是难题主题,因此两个相流的数值模拟仍然是社会的具有挑战性问题之一。该研究侧重于使用Kunz等人建议的2D水翼围绕2D水液处理的不可压缩两相流量的数字代码的开发。用k-氓湍流模型。将仿真结果与实验数据进行比较,以验证开发代码的有效性。此外,计算结果的比较是利用LES结果进行的,以评估诸如K-氓模型的传统湍流模型的能力。计算结果表明,即使此代码无法掌握计算中的小缩小气泡,也表现出与实验观察的非常良好的协议,而LES可以保持真实的物理。此外,通过在政府方程中实现温度敏感性来完成低温流体中的空化计算。尽管结果表现出与先前的计算结果吻合良好的一致性,但还需要进一步研究,以考虑由于温度敏感性导致的低温流体中空化的真实物理学。该代码将进一步扩展到Turbo泵系统中诱导仪和叶轮周围的流体动力学研究的3D可压缩两相流。

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