BEGIN:VCALENDAR
VERSION:2.0
PRODID:researchseminars.org
CALSCALE:GREGORIAN
X-WR-CALNAME:researchseminars.org
BEGIN:VEVENT
SUMMARY:Johan Ulander (Chalmers University of Technology)
DTSTART;VALUE=DATE-TIME:20230830T111500Z
DTEND;VALUE=DATE-TIME:20230830T120000Z
DTSTAMP;VALUE=DATE-TIME:20230925T224108Z
UID:cam/1
DESCRIPTION:Title: Boun
dary-preserving numerical schemes for stochastic (partial) differential eq
uations\nby Johan Ulander (Chalmers University of Technology) as part
of CAM seminar\n\nLecture held in MV:L14.\n\nAbstract\nIn this talk we con
sider stochastic (partial) differential equations whose solutions remain i
n some (half-)bounded domain. This includes\, for example\, models for hea
t flow whose solutions remain positive. In general\, classical numerical s
chemes do not have the property of remaining in such domain. In this half-
way seminar\, I present some novel ideas for developing and analysing boun
dary-preserving numerical schemes for stochastic (partial) differential eq
uations. The presentation is based on joint works with Charles-Edouard Br
éhier\, David Cohen\, and Lluís Quer-Sardanyons.\n
LOCATION:https://researchseminars.org/talk/cam/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yoshio Komori (Kyushu Institute of Technology)
DTSTART;VALUE=DATE-TIME:20230906T111500Z
DTEND;VALUE=DATE-TIME:20230906T120000Z
DTSTAMP;VALUE=DATE-TIME:20230925T224108Z
UID:cam/2
DESCRIPTION:Title: Spli
t S-ROCK methods for high-dimensional stochastic differential equations\nby Yoshio Komori (Kyushu Institute of Technology) as part of CAM semina
r\n\nLecture held in MV:L14.\n\nAbstract\nWe propose explicit stochastic R
unge--Kutta (RK) methods for high-dimensional It\\^{o} stochastic differen
tial equations. By providing a linear error analysis and utilizing a Stran
g splitting-type approach\, we construct them on the basis of orthogonal R
unge--Kutta—Chebyshev methods of order 2. Our methods are of weak order
2 and have high computational accuracy for relatively large time-step size
\, as well as good stability properties. In addition\, we take stochastic
exponential RK methods of weak order 2 as competitors. It is shown that th
e proposed methods can be very effective on high-dimensional problems whos
e drift term has eigenvalues lying near the negative real axis and whose d
iffusion term does not have very large noise. This is a joint work with Pr
of. Kevin Burrage.\n
LOCATION:https://researchseminars.org/talk/cam/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sagy Ephrati (University of Twente)
DTSTART;VALUE=DATE-TIME:20230920T111500Z
DTEND;VALUE=DATE-TIME:20230920T120000Z
DTSTAMP;VALUE=DATE-TIME:20230925T224108Z
UID:cam/3
DESCRIPTION:Title: Stoc
hastic modeling for coarse computational geophysical fluid dynamics\nb
y Sagy Ephrati (University of Twente) as part of CAM seminar\n\nLecture he
ld in MV:L14.\n\nAbstract\nStochasticity has been employed systematically
in geophysical fluid dynamics (GFD) to model uncertainty. Additionally\, f
ully resolving geophysical flows is computationally expensive due to the l
arge range of scales of motion present in these flows. These computational
costs are efficiently mitigated by performing GFD simulations on coarse c
omputational grids and modeling the effects of unresolved scales on resolv
ed scales. On such grids\, the uncertainty due to unresolved small-scale m
otions has to be taken into account as well as the loss of accuracy due to
poorly resolved spatial derivatives. In this presentation\, we discuss ho
w data assimilation methods can be used to derive data-driven stochastic f
orcing for coarse computational GFD. We will show that a straightforward a
lgorithm\, based on several simplifying assumptions\, already leads to qua
litatively accurate outcomes at strongly reduced computational costs.\n
LOCATION:https://researchseminars.org/talk/cam/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Akash Sharma (Chalmers University of Technology and University of
Gothenburg)
DTSTART;VALUE=DATE-TIME:20230913T111500Z
DTEND;VALUE=DATE-TIME:20230913T120000Z
DTSTAMP;VALUE=DATE-TIME:20230925T224108Z
UID:cam/4
DESCRIPTION:Title: Rand
om walks for approximating boundary value problems\nby Akash Sharma (
Chalmers University of Technology and University of Gothenburg) as part of
CAM seminar\n\nLecture held in MV:L14.\n\nAbstract\nWe will present numer
ical method to simulate reflected stochastic differential equations. We ge
neralize this algorithm to approximately solve linear Robin boundary value
problems via their probabilistic representations. In next part of the tal
k\, we will present numerical schemes to simulate confined Langevin dynami
cs which results in approximate solution of specular boundary value proble
ms. We obtain rate of convergence of these algorithms and verify them with
numerical experiments. This is a joint work with Prof. Benedict Leimkuhle
r (University of Edinburgh) and Prof. Michael V. Tretyakov (University of
Nottingham).\n
LOCATION:https://researchseminars.org/talk/cam/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ioanna Motschan-Armen (Chalmers University of Technology and Unive
rsity of Gothenburg)
DTSTART;VALUE=DATE-TIME:20230927T111500Z
DTEND;VALUE=DATE-TIME:20230927T120000Z
DTSTAMP;VALUE=DATE-TIME:20230925T224108Z
UID:cam/5
DESCRIPTION:Title: Eule
r-Maruyama approximations of the stochastic heat equation on the sphere\nby Ioanna Motschan-Armen (Chalmers University of Technology and Univers
ity of Gothenburg) as part of CAM seminar\n\nLecture held in MV:L14.\n\nAb
stract\nThe stochastic heat equation on the sphere driven by additive isot
ropic Wiener\nnoise is approximated by a spectral method in space and forw
ard and backward Euler–\nMaruyama schemes in time. The spectral approxim
ation is based on a truncation of the series\nexpansion with respect to th
e spherical harmonic functions. Optimal strong convergence rates\nfor a gi
ven regularity of the initial condition and driving noise are derived for
the Euler–\nMaruyama methods. Besides strong convergence\, convergence o
f the expectation and second\nmoment is shown\, where the approximation of
the second moment converges with twice the\nstrong rate. Numerical simula
tions confirm the theoretical results.\nThis is joint work with Annika Lan
g.\n
LOCATION:https://researchseminars.org/talk/cam/5/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mohammad Asadzadeh (Chalmers & University of Gothenburg)
DTSTART;VALUE=DATE-TIME:20231011T111500Z
DTEND;VALUE=DATE-TIME:20231011T120000Z
DTSTAMP;VALUE=DATE-TIME:20230925T224108Z
UID:cam/6
DESCRIPTION:Title: On N
itsche approach for a finite element scheme for Maxwell equations\nby
Mohammad Asadzadeh (Chalmers & University of Gothenburg) as part of CAM se
minar\n\nLecture held in MV:L14.\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/cam/6/
END:VEVENT
BEGIN:VEVENT
SUMMARY:TBA
DTSTART;VALUE=DATE-TIME:20231011T111500Z
DTEND;VALUE=DATE-TIME:20231011T120000Z
DTSTAMP;VALUE=DATE-TIME:20230925T224108Z
UID:cam/7
DESCRIPTION:by TBA as part of CAM seminar\n\nLecture held in MV:L14.\nAbst
ract: TBA\n
LOCATION:https://researchseminars.org/talk/cam/7/
END:VEVENT
BEGIN:VEVENT
SUMMARY:TBA
DTSTART;VALUE=DATE-TIME:20231018T111500Z
DTEND;VALUE=DATE-TIME:20231018T120000Z
DTSTAMP;VALUE=DATE-TIME:20230925T224108Z
UID:cam/8
DESCRIPTION:by TBA as part of CAM seminar\n\nLecture held in MV:L14.\nAbst
ract: TBA\n
LOCATION:https://researchseminars.org/talk/cam/8/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Institutionsdag
DTSTART;VALUE=DATE-TIME:20231025T111500Z
DTEND;VALUE=DATE-TIME:20231025T120000Z
DTSTAMP;VALUE=DATE-TIME:20230925T224108Z
UID:cam/9
DESCRIPTION:by Institutionsdag as part of CAM seminar\n\nLecture held in M
V:L14.\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/cam/9/
END:VEVENT
BEGIN:VEVENT
SUMMARY:TBA
DTSTART;VALUE=DATE-TIME:20231101T121500Z
DTEND;VALUE=DATE-TIME:20231101T130000Z
DTSTAMP;VALUE=DATE-TIME:20230925T224108Z
UID:cam/10
DESCRIPTION:by TBA as part of CAM seminar\n\nLecture held in MV:L14.\nAbst
ract: TBA\n
LOCATION:https://researchseminars.org/talk/cam/10/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Luigi Romano (Chalmers University of Technology)
DTSTART;VALUE=DATE-TIME:20231108T121500Z
DTEND;VALUE=DATE-TIME:20231108T130000Z
DTSTAMP;VALUE=DATE-TIME:20230925T224108Z
UID:cam/11
DESCRIPTION:Title: Fin
ite element modelling of linear rolling contact problems\nby Luigi Rom
ano (Chalmers University of Technology) as part of CAM seminar\n\nLecture
held in MV:L14.\n\nAbstract\nThis Master's thesis deals with the numerical
approximation of linear hyperbolic problems appearing in rolling contact
mechanics. First\, the existence and uniqueness of strict solutions to the
considered equations\, which contain nonlocal and boundary terms\, are an
alysed within the framework provided by the semigroup theory. Then\, the s
pace semi-discrete problem is formulated using the discontinuous Galerkin
finite element method (DGMs)\, by replacing the unbounded operator appeari
ng in the abstract formulation with a finite-dimensional one. Quasi-optima
l error convergence is obtained for the space semi-discrete scheme by intr
oducing upwind regularisation. Time discretisation is then achieved by rel
ying on explicit first and second-order Runge-Kutta algorithms (RK1 and RK
2\, respectively)\, yielding quasi-optimal convergence in time owing to ce
rtain refined CFL conditions. In particular\, the considered RK2 schemes c
over the explicit midpoint method\, Heun's second-order method\, and Ralst
on's method.\n
LOCATION:https://researchseminars.org/talk/cam/11/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Moritz Hauck (Chalmers and GU)
DTSTART;VALUE=DATE-TIME:20231115T121500Z
DTEND;VALUE=DATE-TIME:20231115T130000Z
DTSTAMP;VALUE=DATE-TIME:20230925T224108Z
UID:cam/12
DESCRIPTION:by Moritz Hauck (Chalmers and GU) as part of CAM seminar\n\nLe
cture held in MV:L14.\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/cam/12/
END:VEVENT
BEGIN:VEVENT
SUMMARY:TBA
DTSTART;VALUE=DATE-TIME:20231122T121500Z
DTEND;VALUE=DATE-TIME:20231122T130000Z
DTSTAMP;VALUE=DATE-TIME:20230925T224108Z
UID:cam/13
DESCRIPTION:by TBA as part of CAM seminar\n\nLecture held in MV:L14.\nAbst
ract: TBA\n
LOCATION:https://researchseminars.org/talk/cam/13/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Michael Roop (Chalmers and GU)
DTSTART;VALUE=DATE-TIME:20231129T121500Z
DTEND;VALUE=DATE-TIME:20231129T130000Z
DTSTAMP;VALUE=DATE-TIME:20230925T224108Z
UID:cam/14
DESCRIPTION:Title: Lie
-Poisson methods for incompressible magnetohydrodynamics on the sphere
\nby Michael Roop (Chalmers and GU) as part of CAM seminar\n\nLecture held
in MV:L14.\n\nAbstract\nWe present a novel structure preserving numerical
method for Lie-Poisson systems on the dual of semidirect product Lie alge
bras. The method fully preserves the underlying geometry\, namely the Lie-
Poisson structure and all the Casimirs\, and nearly preserves the Hamilton
ian function. We illustrate the method on two models describing the motion
of magnetic fluids\, the equations of incompressible magnetohydrodynamics
\, and the Alfvén wave turbulence equations. For the latter case\, we rev
eal the formation of large scale quasi-periodic vortex blob dynamics.\n\nT
his is a joint work with Klas Modin.\n
LOCATION:https://researchseminars.org/talk/cam/14/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Eric Lindström
DTSTART;VALUE=DATE-TIME:20231206T121500Z
DTEND;VALUE=DATE-TIME:20231206T130000Z
DTSTAMP;VALUE=DATE-TIME:20230925T224108Z
UID:cam/15
DESCRIPTION:by Eric Lindström as part of CAM seminar\n\nLecture held in M
V:L14.\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/cam/15/
END:VEVENT
END:VCALENDAR