Indescreet trails at the surface
type: Dataset
contact point: Organization
  fn: CCSD
keyword: spimecameflengineering-sciences-physicsmechanics-physicsmed-phfluids-mechanics-physicsc
keyword: tourbillons
keyword: cavites
keyword: stabilite
keyword: flow
keyword: ecoulements
keyword: stability
keyword: waves
keyword: cavities
keyword: theses
keyword: wave-drag
keyword: infoeu-reposemanticsdoctoralthesis
keyword: surface
keyword: ondes
keyword: vortices
keyword: trainee-de-vague
keyword: physmecameflphysics-physicsmechanics-physicsfluid-mechanics-physicsclass-ph
landing page: https://pastel.hal.science/pastel-00860739
description: We investigate several phenomena at the surface of water, that are either traces of an object, or of a former event. First, we study the cavities formed by explosions at the surface of water. In a large bath, the cavities grow with a hemispherical shape, and then collapse anisotropically, what creates a vertical jet. This evolution results of an energy balance between kinetic and potential energy. Confining the cavities in vertical opened tubes we observe that the cavities never escapes. In a second part, we study the impact of vortex rings on surfaces. We observe that the vortex diameter is doubled in the interaction we the free surface of water, while it expands a lot more in ethanol. This difference comes from the fact that the free surface of water is equivalent to a rigid surface for the ring, what enhances the formation of secondary vortices. The third part deals with the wave drag of submerged spheres. We observe that there is a large discrepancy between the predicted and measured force, in the range where it is large. We measure the waves amplitude and show that taking into account their saturation can correct the theoretical estimation.
issued: 2026-05-09T19:01:13.354438
language: fr
modified: 2026-05-09T19:01:13.354443

test_moissonnage_selune
type: Agent

Indescreet trails at the surface
type: Distribution
access URL: https://pastel.hal.science/pastel-00860739
format: HTML
issued: 2026-05-09T19:01:13.364725
modified: 2026-05-09T19:01:13.338091