// else { // // return true; // } // } // function ShowTwo(webUrl){ // alert("22"); // $.funkyUI({url:webUrl,css:{width:"600",height:"500"}}); // } //window.onload = pdfdownloadjudge;
OJFD> Vol.4 No.1, March 2014
Share This Article:
Cite This Paper >>

Numerical Analysis of Electromagnetic Control of the Boundary Layer Flow on a Ship Hull

Abstract Full-Text HTML Download Download as PDF (Size:2018KB) PP. 74-82
DOI: 10.4236/ojfd.2014.41006    3,863 Downloads   5,909 Views   Citations
Author(s)    Leave a comment
Mohammad Bakhtiari, Hassan Ghassemi

Affiliation(s)

.
Department of Ocean Engineering, Amirkabir University of Technology, Tehran, Iran.

ABSTRACT

In this article, electromagnetic control of turbulent boundary layer on a ship hull is numerically investigated. This study is conducted on the geometry of tanker model hull. For this purpose, a combination of electric and magnetic fields is applied to a region of boundary layer on stern so that produce wall parallel Lorentz forces in streamwise direction as body forces in stern flow. The governing equations including RANS equations with SST k-ω turbulent model coupled with electric potential equation are numerically solved by using Ansys Fluent codes. Accuracy of this turbulent model of Fluent in predicting Turbulent flow around a ship is also tested by comparing with available experimental results that it shows a good agreement with experimental data. The results obtained for ship flow show that by applying streamwise Lorentz forces that are large enough, flow is accelerated. The results are caused to delay or avoid the flow separation in stern, increase the propeller inlet velocity, create uniform flow distribution behind the ship’s hull in order to improve the propeller performance, and finally decrease the pressure resistance and total resistance.

KEYWORDS

Electromagnetic Control; Boundary Layer; Turbulent Flow; Flow Separation; Resistance

Cite this paper

Bakhtiari, M. and Ghassemi, H. (2014) Numerical Analysis of Electromagnetic Control of the Boundary Layer Flow on a Ship Hull. Open Journal of Fluid Dynamics, 4, 74-82. doi: 10.4236/ojfd.2014.41006.

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1] Henoch, C. and Stace, J. (1995) Experimental Investigation of a Salt Water Turbulent Boundary Layer Modified by an Applied Streamwise Magnetohydrodynamic Body Force. Physics of Fluids, 7, 1371-1383. http://dx.doi.org/10.1063/1.868525
[2] Weier, T., Fey, U., Gerbeth, G., Mutschke, G., Lielausis, O. and Platacis, E. (2001) Boundary Layer Control by Means of Wall Parallel Lorentz Forces. Magnetohydrodynamics, 37, 177-186.
[3] Crawford, C.H. and Karniadakis, G.E. (1997) Reynolds Stress Analysis of EMHD-Controlled Wall Turbulence: Part I Streamwise Forcing. Physics of Fluids, 9, 788-806. http://dx.doi.org/10.1063/1.869210
[4] Nosenchuck, D. and Brown, G. (1993) Discrete Spatial Control of Wall Shear Stress in a Turbulent Boundary Layer. In: So, R., Speziale, C. and Launder, B., Eds., Near-Wall Turbulent Flows, Elsevier, Amsterdam.
[5] Weier, T., Gerbeth, G., Mutschke, G., Platacis, E. and Lielausis, O. (1998) Experiments on Cylinder Wake Stabilization in an Electrolyte Solution by Means of Electromagnetic Forces Localized on the Cylinder Surface. Experimental Thermal and Fluid Science, 16, 84-91. http://dx.doi.org/10.1016/S0894-1777(97)10008-5
[6] Kim, S. and Lee, C. (2000) Investigation of the Flow around a Circular Cylinder under the Influence of an Electromagnetic Force. Experiments in Fluids, 28, 252-260. http://dx.doi.org/10.1007/s003480050385
[7] Posdziech, O. and Grundmann R. (2001) Electromagnetic Control of Seawater Flow around Circular Cylinders. European Journal of Mechanics, 20, 255-274. http://dx.doi.org/10.1016/S0997-7546(00)01111-0
[8] Chen, Z. and Aubry, N. (2005) Active Control of Cylinder Wake. Communications in Nonlinear Science and Numerical Simulation, 10, 205-216. http://dx.doi.org/10.1016/S1007-5704(03)00128-X
[9] Shatrov, V. and Yakovlev, V. (1985) Hydrodynamic Drag of a Ball Containing Aconduction-Type Source of Electromagnetic Fields. Journal of Applied Mechanics and Technical Physics, 26, 19-24. http://dx.doi.org/10.1007/BF00919618
[10] Shatrov, V. and Yakovlev, V. (1990) The Possibility of Reducing Hydrodynamic Resistance through Magnetohydrodynamic Streaming of a Sphere. Magnetohydrodynamics, 26, 114-119.
[11] Hino, T. (2005) CFD Workshop Tokyo 2005. National Maritime Research Institute, Tokyo.

  
comments powered by Disqus
OJFD Subscription
E-Mail Alert
OJFD Most popular papers
Publication Ethics & OA Statement
OJFD News
Frequently Asked Questions
Recommend to Peers
Recommend to Library
Contact Us

Copyright © 2020 by authors and Scientific Research Publishing Inc.

Creative Commons License

This work and the related PDF file are licensed under a Creative Commons Attribution 4.0 International License.