[Faculty] Fwd: [CSRC.COLLOQUIUM] "Numerical Modeling of Solar Storm Dynamics from the Sun to Earth "

[Jose Castillo]

[image: SDSU_CSRC Logo.jpg]


DATE:
*Friday, September 23, 2022*


TITLE:
*Numerical Modeling of Solar Storm Dynamics from the Sun to Earth   *



TIME:
*3:30-4:30PM*



LOCATION:
*In Person - GMCS 314*

SPEAKER/BIO:
*Ronald Caplan, Computational Science, Predictive Science Inc*



ABSTRACT:
Solar storms, including coronal mass ejections (CMEs), are large explosive
events on the Sun that are capable of ejecting billions of tons of
magnetized, million-degree plasma into space. When these CMEs reach Earth,
they can disrupt radio transmissions, damage satellites, and severely
impact power transmission grids, leading to extended large-scale power
outages.  Due to their inherent complexity, the mechanisms that control CME
properties are poorly understood and challenging to model empirically.
Data-constrained magnetohydrodynamic (MHD) simulations provide a powerful
tool for improving our understanding of CMEs and our predictive
capabilities. Such simulations must incorporate the large-scale solar
corona and inner heliosphere and, therefore, require the use of multiple
numerical techniques and high-performance computing platforms.  In this
talk, we will highlight two of these components.


First, we will discuss the use of stabilized extended Runge-Kutta methods
(also known as `super time-stepping schemes') to integrate parabolic
operators (such as heat diffusion) at very large time-steps.  These
unconditionally stable explicit schemes are compared to an implicit Krylov
subspace preconditioned conjugate gradient method.  We show that they can
be more scalable across large compute clusters and can be comparable or
better in overall performance.

Second, we will discuss the use of accelerated computing on GPUs to allow
for moderate-sized simulations to be performed on in-house workstations, as
well as for very large simulations to utilize dozens of GPUs on
supercomputers.  The process of adapting our legacy code to run on GPUs is
described, where we make use of the OpenACC programming model, as well as
standard Fortran parallelism using `do concurrent'.

An example of a full Sun-to-Earth simulation of a CME is shown, utilizing
our new web-based interactive interface called CORHEL-AMCG.  This interface
allows non-experts to set up and run solar storm simulations, and will soon
be delivered to NASA's Community Coordinated Modeling Center for public use.


Host:
*Ricardo Carretero*

Note: Videos of previous colloquium talks can be seen on the CSRC website
in the colloquium archive section or on the CSRC YouTube page here
<https://www.youtube.com/channel/UCN0ZEztlmyDqG2pm-Rle_Eg/feed>.





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