Now showing items 1-3 of 3

  • The persistence of balance in geophysical flows 

    Dritschel, David Gerard; Viudez, A (2007-01-10) - Journal article
    Rotating stably stratified geophysical flows can exhibit a near 'balanced' evolution controlled by the conservative advection of a single scalar quantity, the potential vorticity (PV). This occurs frequently in the Earth's ...
  • The quasi-geostrophic ellipsoidal vortex model 

    Dritschel, David Gerard; Reinaud, Jean Noel; McKiver, William J (2004-04-25) - Journal article
    We present a simple approximate model for studying general aspects of vortex interactions in a rotating stably-stratified fluid. The model idealizes vortices by ellipsoidal volumes of uniform potential vorticity, a materially ...
  • Vanishing enstrophy dissipation in two-dimensional Navier--Stokes turbulence in the inviscid limit 

    Tran, Chuong Van; Dritschel, David Gerard (2006-07-25) - Journal article
    Batchelor (Phys. Fluids, vol. 12, 1969, p. 233) developed a theory of two-dimensional turbulence based on the assumption that the dissipation of enstrophy (mean-square vorticity) tends to a finite non-zero constant in the ...