On the impact of a concave nosed axisymmetric body on a free surface

Varghese Mathai, R.N. Govardhan, V.H. Arakeri

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

We report on an experimental study of the vertical impact of a concave nosed axisymmetric body on a free surface. Previous studies have shown that bodies with a convex nose, like a sphere, produce a well defined splash with a relatively large cavity behind the model. In contrast, we find that with a concave nose, there is hardly a splash and the cavity extent is greatly reduced. This may be explained by the fact that in the concave nosed case, the initial impact is between a confined air pocket and the free surface unlike in the convex nosed case. From measurements of the unsteady pressure in the concave nose portion, we show that in this case, the maximum pressures are significantly lower than the classically expected “water hammer” pressures and also lower than those generally measured on other geometries. Thus, the presence of an air pocket in the case of a concave nosed body adds an interesting dimension to the classical problem of impact of solid bodies on to a free surface.
Original languageEnglish
Article number064101
Pages (from-to)064101-
Number of pages4
JournalApplied physics letters
Volume106
Issue number6
DOIs
Publication statusPublished - 9 Feb 2015

Keywords

  • IR-95731
  • METIS-309207

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    Mathai, V., Govardhan, R. N., & Arakeri, V. H. (2015). On the impact of a concave nosed axisymmetric body on a free surface. Applied physics letters, 106(6), 064101-. [064101]. https://doi.org/10.1063/1.4907555