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Controlling of the boundary layer flow on a ship hull using MHD

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Abstract

In this article, electromagnetic control of a turbulent boundary layer (TBL) on a ship hull, without free surface effects, is numerically investigated. This study is conducted on the KVLCC2M ship model hull. For this purpose, a combination of electric and magnetic fields is applied to a region of the boundary layer on the stern to produce wall-parallel Lorentz forces in streamwise direction as body forces in a ship’s stern flow. The governing equation including RANS equations with shear-stress transport (SST) k−ω turbulent model coupled with electric potential equation is numerically solved by using Ansys Fluent codes. Before using for ship’s flow, Fluent electric potential code is validated by simulating magneto-hydro-dynamics (MHD) flow in a rectangular duct and comparing obtained numerical solutions with exact solutions. Accuracy of SST k−ω turbulent model in predicting turbulent flow around a ship is also tested by comparing with available experimental data. The results obtained for ship flow show that by applying streamwise Lorentz forces, flow is accelerated. The results are caused to delay or avoid the flow separation in stern and make uniform flow distribution behind the ship’s hull. It is caused to improve the propeller performance and diminish the total resistance.

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Acknowledgments

This research was supported by High Performance Computing Research Center (HPCRC) at Amirkabir University of Technology, which is acknowledged. The authors wish to thank the reviewers for their valuable comments and suggestions.

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Authors and Affiliations

  1. Department of Ocean Engineering, Amirkabir University of Technology, Hafez Ave, P.O. Box 15875-4413, Tehran, Iran

    Mohammad Bakhtiari & Hassan Ghassemi

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  1. Mohammad Bakhtiari
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  2. Hassan Ghassemi
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Correspondence to Hassan Ghassemi.

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Technical Editor: Francisco Ricardo Cunha.

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Bakhtiari, M., Ghassemi, H. Controlling of the boundary layer flow on a ship hull using MHD. J Braz. Soc. Mech. Sci. Eng. 37, 479–493 (2015). https://doi.org/10.1007/s40430-014-0178-3

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  • DOI: https://doi.org/10.1007/s40430-014-0178-3

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