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UID:submissions.pasc-conference.org_PASC24_sess158_pos123@linklings.com
SUMMARY:P33 - Inviscid Dynamo Simulation Using QuICC
DESCRIPTION:Poster\n\nLonghui Yuan, Andrew Jackson, Philippe Marti, and Ji
 awen Luo (ETH Zurich)\n\nEarth’s magnetic field is believed to be generate
 d in the metallic outer core through a process known as the geodynamo. Dir
 ect numerical simulation (DNS) of the geodynamo has successfully reproduce
 d many features of the Earth’s field. However, even the state-of-the-art s
 imulations have a much higher viscosity than the Earth’s outer core. Taylo
 r (1963) proposed a reduced model by neglecting inertia and viscous force.
  A modified model that partially re-introduces the inertia term back is te
 rmed the torsional wave (TW) dynamo model. Luo (2021) developed the first 
 3D TW dynamo model (or inviscid convective dynamo model), a branch of the 
 fully spectral efficiently parallelized CFD code QuICC. In this study, we 
 present new results of inviscid dynamo simulation at a higher truncation l
 evel L_{B}= 80. We observe the geostrophic flow dominates the velocity fie
 ld, and the dipolar component dominates the magnetic field. The inviscid s
 olution fundamentally differs from the viscous dynamos (with Ekman number 
 E = 10^(-5)), which all have non-dipolar magnetic fields. Our inviscid sim
 ulation has great potential to give new insights into the geodynamo and ot
 her planetary dynamos, which current DNS can hardly achieve.\n\nSession Ch
 air: Iva Kavcic (Met Office)
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