Zobrazeno 1 - 10
of 154
pro vyhledávání: '"Smolarkiewicz, P. K."'
Implicit time-stepping for advection is applied locally in space and time where Courant numbers are large, but standard explicit time-stepping is used for the remaining solution which is typically the majority. This adaptively implicit advection sche
Externí odkaz:
http://arxiv.org/abs/2406.08640
Publikováno v:
Volume 521, Issue 1, May 2023, Pages 1415 1428
Magnetic fields have been observed in massive Ap/Bp stars and presumably are also present in the radiative zone of solar-like stars. Yet, to date there is no clear understanding of the dynamics of the magnetic field in stably stratified layers. A pur
Externí odkaz:
http://arxiv.org/abs/2211.10536
Simulating deep solar convection and its coupled mean-field motions is a formidable challenge where few observational results constrain models that suffer from the non-physical influence of the grid resolution. We present hydrodynamic global Implicit
Externí odkaz:
http://arxiv.org/abs/2208.05738
Large-eddy simulations (LES) and implicit LES (ILES) are wise and affordable alternatives to the unfeasible direct numerical simulations (DNS) of turbulent flows at high Reynolds numbers (Re). However, for systems with few observational constraints,
Externí odkaz:
http://arxiv.org/abs/2202.02767
Semi-implicit time-stepping schemes for atmosphere and ocean models require elliptic solvers that work efficiently on modern supercomputers. This paper reports our study of the potential computational savings when using mixed precision arithmetic in
Externí odkaz:
http://arxiv.org/abs/2103.16120
A numerical study of stably stratified flows past spheres at Reynolds numbers $Re=200$ and $Re=300$ is reported. In these flow regimes, a neutrally stratified laminar flow induces distinctly different near-wake features. However, the flow behaviour c
Externí odkaz:
http://arxiv.org/abs/2101.06807
The work extends the computational model EULAG-MHD to include Hall magnetohydrodynamics (HMHD)---important to explore physical systems undergoing fast magnetic reconnection at the order of the ion inertial length scale. Examples include solar transie
Externí odkaz:
http://arxiv.org/abs/2011.04223
It is tested whether machine learning methods can be used for preconditioning to increase the performance of the linear solver -- the backbone of the semi-implicit, grid-point model approach for weather and climate models. Embedding the machine-learn
Externí odkaz:
http://arxiv.org/abs/2010.02866
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Various models of solar subsurface stratification are tested in the global EULAG-MHD solver to simulate diverse regimes of near-surface convective transport. Sub- and superadiabacity are altered at the surface of the model ($ r > 0.95~R_{\odot}$) to
Externí odkaz:
http://arxiv.org/abs/1911.09658