{
  "annotation_id": "9b1c8a1f-cadd-46a7-a70a-ba85c41e4d94",
  "date_created": "2026-03-02T18:01:04.181000Z",
  "date_modified": "2026-03-02T18:01:04.181000Z",
  "file_hash": "0224721350742d450cd119f61ecf67f3e982653b97b7d4c066ab9783ebc7af2e",
  "private": false,
  "record": {
    "abstract": "This work is an attempt to test the concept of hydrodynamic charge (analogous\nto the electric charge in Electromagnetism) in the simple case of a coherent\nstructure such as the Burgers vortex. We provide experimental measurements of\nboth the so-called Lamb vector and its divergence (the charge) by\ntwo-dimensional Particle Image Velocimetry. In addition, we perform a\nHelmholtz-Hodge decomposition of the Lamb vector in order to explore its\ntopological features. We compare the charge with the well-known Q criterion in\norder to assess its interest in detecting and characterizing coherent\nstructure. Usefulness of this concept in studies of vortex dynamics is\ndemonstrated.",
    "arxiv_id": "physics/0512165",
    "authors": [
      "Germain Rousseaux",
      "Shahar Seifer",
      "Victor Steinberg",
      "Alexander Wiebel"
    ],
    "categories": [
      "physics.class-ph"
    ],
    "doi": "10.1007/s00348-006-0238-2",
    "journal_ref": "Experiments in Fluids 42 (2007) p. 291-299",
    "title": "On the Lamb Vector and the Hydrodynamic Charge",
    "url": "https://arxiv.org/abs/physics/0512165"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "40387212-c418-40a4-9de2-d90db446a305",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}