SOME DISCUSSIONS ON THE FREE SURFACE FLOW AROUND THE BOW

To elucidate the free surface phenomena around the ship bow, experiments using simple wedge-shaped models are conducted in the towing tank. It is found that the surface tension has a remarkable effect on the free surface pattern around the model. It is shown that the surface activator compound is very effective in eliminating the effect of the surface tension. Free surface configurations free from the surface tension observed by photographs after application of the surface activator are examined in detail. To apply the theoretical analysis to the wave pattern under the effect of the surface tension, the ray theory is effectively employed, and a differential equation that determines the curve of the capillary wave front around the wedge is obtained. The ray theory is applied also to the wave pattern at the bow when the surface tension is eliminated, and it is concluded that the wave configuration changes its characteristics, when the entrance angle exceeds 60 degrees. This fact is clearly proved by experimental observation. Next, the effect of surface tension on the resistance of ship models is examined by applying the surface activator in the resistance test. A considerable difference in resistance is observed when the surface tension is removed. Therefore, the scale effect due to surface tension should be taken into account in the lower speed range.

  • Supplemental Notes:
    • Conference paper
  • Authors:
    • Maruo, H
    • Ikehata, M
  • Conference:
  • Publication Date: 0

Media Info

  • Features: References;
  • Pagination: 13p., incl. discuss.

Subject/Index Terms

Filing Info

  • Accession Number: 00657860
  • Record Type: Publication
  • Source Agency: Maritime Technical Information Facility
  • Files: TRIS
  • Created Date: Jul 21 1994 12:00AM