Abstract
Verification and validation (V&V) is a helpful tool for evaluating simulation errors, but its application in unsteady cavitating flow remains a challenging issue due to the difficulty in meeting the requirement of an asymptotic range. Hence, a new V&V approach for large eddy simulation (LES) is proposed. This approach offers a viable solution for the error estimation of simulation data that are unable to satisfy the asymptotic range. The simulation errors of cavitating flow around a projectile near the free surface are assessed using the new V&V method. The evident error values are primarily dispersed around the cavity region and free surface. The increasingly intense cavitating flow increases the error magnitudes. In addition, the modeling error magnitudes of the Dynamic Smagorinsky–Lilly model are substantially smaller than that of the Smagorinsky–Lilly model. The present V&V method can capture the decrease in the modeling errors due to model enhancements, further exhibiting its applicability in cavitating flow simulations. Moreover, the monitoring points where the simulation data are beyond the asymptotic range are primarily dispersed near the cavity region, and the number of such points grows as the cavitating flow intensifies. The simulation outcomes also suggest that the re-entrant jet and shedding cavity collapse are the chief sources of vorticity motions, which remarkably affect the simulation accuracy. The results of this study provide a valuable reference for V&V research.
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Funding
Funding Supported by the National Key R&D Program of China (2022YFB3303501), the National Natural Science Foundation of China (Project Nos. 52176041 and 12102308) and the Fundamental Research Funds for the Central Universities (Project Nos. 2042023kf0208 and 2042023kf0159). The numerical calculations in this paper were done on the supercomputing system in the Supercomputing Center of Wuhan University.
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Article Highlights
• A new verification and validation (V&V) method for LES model is proposed.
• The V&V method is adopted to evaluate the simulation errors of cavitating flow around a projectile.
• The study discusses the cavitation-vortex interaction and its influence on the errors distribution.
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Deng, L., Long, Y., Cheng, H. et al. Verification and Validation for Large Eddy Simulation of Cavitating Flow Around a Projectile Near the Free Surface. J. Marine. Sci. Appl. (2024). https://doi.org/10.1007/s11804-024-00480-9
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DOI: https://doi.org/10.1007/s11804-024-00480-9