Počet záznamů: 1

Earth's core convection: Boussinesq approximation or incompressible approach?

  1. 1.
    0341124 - GFU-E 2011 RIV GB eng J - Článek v odborném periodiku
    Anufriev, A. P. - Hejda, Pavel
    Earth's core convection: Boussinesq approximation or incompressible approach?.
    Geophysical and Astrophysical Fluid Dynamics. Roč. 104, č. 1 (2010), s. 65-83 ISSN 0309-1929
    Grant CEP: GA AV ČR IAA300120704
    Grant ostatní: INTAS(XE) 03-51-5807
    Výzkumný záměr: CEZ:AV0Z30120515
    Klíčová slova: geodynamic models * core convection * Boussinesq approximation
    Kód oboru RIV: DE - Zemský magnetismus, geodézie, geografie
    Impakt faktor: 0.831, rok: 2010

    Most geodynamo models are based on the Boussinesq approximation that simplifies the mathematics of the problem by neglecting the compressibility of the liquid in the Earth's core. However, the Boussinesq approximation not only disregards the compressibility in the momentum and the continuity equations, but also neglects adiabatic cooling in the heat transport equation which is connected with the reference state temperature distribution T (r). Whereas the former simplification introduces an acceptable inaccuracy, the latter changes the scene in a substantial way and makes the Boussinesq approximation nonadequate for the problem, especially at the onset of the convection.
    Trvalý link: http://hdl.handle.net/11104/0184204