Zobrazeno 1 - 10
of 141
pro vyhledávání: '"Vasil, Geoffrey M."'
Autor:
Vasil, Geoffrey M, Lecoanet, Daniel, Augustson, Kyle, Burns, Keaton J, Oishi, Jeffrey S, Brown, Benjamin P, Brummell, Nicholas, Julien, Keith
The Sun's magnetic dynamo cycle features a distinct pattern: a propagating region of sunspot emergence appears around 30 degrees latitude and vanishes near the equator every 11 years. Moreover, longitudinal flows called "torsional oscillations" close
Externí odkaz:
http://arxiv.org/abs/2404.07740
Autor:
O'Connor, Liam, Lecoanet, Daniel, Anders, Evan H., Augustson, Kyle C., Burns, Keaton J., Vasil, Geoffrey M., Oishi, Jeffrey S., Brown, Benjamin P.
Even when the partial differential equation underlying a physical process can be evolved forward in time, the retrospective (backward in time) inverse problem often has its own challenges and applications. Direct Adjoint Looping (DAL) is the defacto
Externí odkaz:
http://arxiv.org/abs/2403.00937
Autor:
Chok, James, Vasil, Geoffrey M.
Rational function approximations provide a simple but flexible alternative to polynomial approximation, allowing one to capture complex non-linearities without oscillatory artifacts. However, there have been few attempts to use rational functions on
Externí odkaz:
http://arxiv.org/abs/2310.12053
Autor:
Anders, Evan H., Lecoanet, Daniel, Cantiello, Matteo, Burns, Keaton J., Hyatt, Benjamin A., Kaufman, Emma, Townsend, Richard H. D., Brown, Benjamin P., Vasil, Geoffrey M., Oishi, Jeffrey S., Jermyn, Adam S.
Publikováno v:
Nature Astronomy, 2023, 10.1038/s41550-023-02040-7
Massive stars die in catastrophic explosions, which seed the interstellar medium with heavy elements and produce neutron stars and black holes. Predictions of the explosion's character and the remnant mass depend on models of the star's evolutionary
Externí odkaz:
http://arxiv.org/abs/2306.08023
Autor:
Chok, James, Vasil, Geoffrey M.
We propose a new iteration scheme, the Cauchy-Simplex, to optimize convex problems over the probability simplex $\{w\in\mathbb{R}^n\ |\ \sum_i w_i=1\ \textrm{and}\ w_i\geq0\}$. Other works have taken steps to enforce positivity or unit normalization
Externí odkaz:
http://arxiv.org/abs/2305.09046
Autor:
Featherstone, Nicholas A., Augustson, Kyle C., Aurnou, Jonathan M., Blume, Catherine, Brown, Benjamin P., Brummell, Nicholas, Burns, Keaton J., Calkins, Michael A., Camisassa, Maria, Dikpati, Mausumi, Fan, Yuhong, Fuentes, J. R., Guerrero, Gustavo, Hindman, Bradley W., Julien, Keith, Kitiashvili, Irina N., Korre, Lydia, Lecoanet, Daniel, Manek, Bhishek, Matilsky, Loren, Miesch, Mark, Nelson, Nicholas J., Oishi, Jeffrey S., Powers, Whitney T., Rempel, Matthias, Soderlund, Krista, Stejko, Andrey M., Vasil, Geoffrey M.
The operation of the solar dynamo, with all of its remarkable spatio-temporal ordering, remains an outstanding problem of modern solar physics. A number of mechanisms that might plausibly contribute to its operation have been proposed, but the relati
Externí odkaz:
http://arxiv.org/abs/2305.08823
Autor:
Hester, Eric W., Vasil, Geoffrey M.
Publikováno v:
Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 479, no. 2277 (2023): 20230080
We provide an elementary derivation of an orthogonal coordinate system for boundary layers around evolving smooth surfaces and curves based on the signed-distance function. We go beyond previous works on the signed-distance function and collate usefu
Externí odkaz:
http://arxiv.org/abs/2302.02891
Polynomial spectral methods produce fast, accurate, and flexible solvers for broad ranges of PDEs with one bounded dimension, where the incorporation of general boundary conditions is well understood. However, automating extensions to domains with mu
Externí odkaz:
http://arxiv.org/abs/2211.17259
Autor:
Kaufman, Emma, Lecoanet, Daniel, Anders, Evan H., Brown, Benjamin P., Vasil, Geoffrey M., Oishi, Jeffrey S., Burns, Keaton J.
Convection in massive main sequence stars generates large scale magnetic fields in their cores which persists as they evolve up the red giant branch. The remnants of these fields may take the form of the Prendergast magnetic field, a combination of p
Externí odkaz:
http://arxiv.org/abs/2209.14339
Autor:
Meyer, Colin R., Buffo, Jacob J., Nimmo, Francis, Wells, Andrew J., Boury, Samuel, Tomlinson, Tara C., Parkinson, Jamie R. G., Vasil, Geoffrey M.
Enceladus is a primary target for astrobiology due to the $\rm H_2O$ plume ejecta measured by the Cassini spacecraft and the inferred subsurface ocean sustained by tidal heating. Sourcing the plumes via a direct connection from the ocean to the surfa
Externí odkaz:
http://arxiv.org/abs/2208.06714