A CFD based Kriging model for predicting the impact force on the sphere bottom during the early-water entry. (1st January 2022)

• Record Type: Journal Article
• Authors: Shen, Cong; Yu, Pengyao; Wang, Tianlin; Chen, Nian-Zhong
• Is Part Of: Ocean engineering. Volume 243(2022)
• Publication Date: 2022-01-01
• Subjects: Computational fluid dynamics (CFD) -- Kriging model -- Impact force -- Water entry; Ocean engineering -- Periodicals; Ocean engineering; Periodicals; 620.4162
• DOI: 10.1016/j.oceaneng.2021.110304
• Languages: English
• ISSNs: 0029-8018

Abstract

Abstract: To efficiently achieve an accurate trajectory of the ocean observation device with a spherical bottom when it is thrown into the sea in the airdrop deployment, a computational fluid dynamics (CFD) based Kriging model is established for predicting the impact force on the sphere bottom during the early-water entry stage which is considered as the beginning of a full immersion process. The early-water entry of a sphere is simulated using the Reynolds-Averaged Navier-Stokes (RANS) method and k–ϵ turbulent model and the validity of the CFD model is verified by the comparison with experimental data. A Kriging surrogate model is then established based on the results of CFD simulation and extensive sample points where a proper range for the correlation parameter of the Kriging model is achieved through a study on the effect of the correlation parameter on the results from the Kriging model. The comparison with the CFD simulation results shows that the established Kriging model significantly improves the computational efficiency while maintaining high numerical accuracy. Highlights: A CFD based Kriging model for predicting the impact force on the sphere bottom during the early-water entry is established. The Kriging model significantly improves the computational efficiency meanwhile maintaining high numerical accuracy. The effect of the initial impact velocity and mass of the sphere on the impact force is investigated.