BEGIN:VCALENDAR
VERSION:2.0
PRODID:researchseminars.org
CALSCALE:GREGORIAN
X-WR-CALNAME:researchseminars.org
BEGIN:VEVENT
SUMMARY:Qingyuan Zhao (University of Cambridge)
DTSTART:20240213T140000Z
DTEND:20240213T145000Z
DTSTAMP:20260404T100116Z
UID:UEA_mth/1
DESCRIPTION:Title: Sensitivity analysis for observational studies: past\, now and futu
re\nby Qingyuan Zhao (University of Cambridge) as part of Fluids and S
tructures Seminar @ UEA\n\nLecture held in ZICER 2.03.\n\nAbstract\nAny ob
servational study of causal relationships relies on untestable assumptions
. Thus\, the credibility of a study crucially depends on the extent that i
ts assumptions can be defended. The purpose of this talk is to give a high
-level overview of how the statistical literature on sensitivity analysis
evolved from its inception in the debate about smoking and lung cancer in
the 1950s. I will review the first sensitivity analysis by Cornfield in 19
59\, the model and methodology based on randomization inference proposed b
y Rosenbaum\, and other related literature. A recent emerging trend is to
formulate sensitivity analysis for observational studies as a stochastic p
rogramming problem\, which provides a unified conceptual framework for man
y existing models and methods. I will review some recent progress in this
area and highlight the variety of theoretical\, methodological\, and pract
ical difficulties involved in this framework. Part of this talk is based o
n joint work with Yao Zhang and Tobias Freidling.\n
LOCATION:https://stable.researchseminars.org/talk/UEA_mth/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mansi Singh (IIT Kharagpur)
DTSTART:20240220T140000Z
DTEND:20240220T145000Z
DTSTAMP:20260404T100116Z
UID:UEA_mth/2
DESCRIPTION:Title: Mathematical study of hydrodynamic response of non-uniform thin fle
xible plates in frequency and time domain\nby Mansi Singh (IIT Kharagp
ur) as part of Fluids and Structures Seminar @ UEA\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/UEA_mth/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Rui Zhu (City University of London)
DTSTART:20240227T140000Z
DTEND:20240227T145000Z
DTSTAMP:20260404T100116Z
UID:UEA_mth/3
DESCRIPTION:Title: Locally-enriched cross-reconstruction for few-shot fine-grained ima
ge classification\nby Rui Zhu (City University of London) as part of F
luids and Structures Seminar @ UEA\n\nLecture held in TPSC 2.05A.\n\nAbstr
act\nFew-shot fine-grained image classification has attracted considerable
attention in recent years for its realistic setting to imitate how humans
conduct recognition tasks. Metric-based few-shot classifiers have achieve
d high accuracies. However\, their metric function usually requires two ar
guments of vectors\, while transforming or reshaping three-dimensional fea
ture maps to vectors can result in loss of spatial information. Image reco
nstruction is thus involved to retain more appearance details: the test im
ages are reconstructed by different classes and then classified to the one
with the smallest reconstruction error. However\, discriminative local in
formation\, vital to distinguish sub-categories in fine-grained images wit
h high similarities\, is not well elaborated when only the base features f
rom a usual embedding module are adopted for reconstruction. Hence\, we pr
opose the novel local content-enriched cross-reconstruction network (LCCRN
) for few-shot fine-grained classification. In LCCRN\, we design two new m
odules: the local content-enriched module (LCEM) to learn the discriminati
ve local features\, and the cross-reconstruction module (CRM) to fully eng
age the local features with the appearance details obtained from a separat
e embedding module. The classification score is calculated based on the we
ighted sum of reconstruction errors of the cross-reconstruction tasks\, wi
th weights learnt from the training process. Extensive experiments on four
fine-grained datasets showcase the superior classification performance of
LCCRN compared with the state-of-the-art few-shot classification methods.
Codes are available at:https://github.com/lutsong/LCCRN.\n
LOCATION:https://stable.researchseminars.org/talk/UEA_mth/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Giuseppe Baio (University of East Anglia)
DTSTART:20240305T140000Z
DTEND:20240305T145000Z
DTSTAMP:20260404T100116Z
UID:UEA_mth/4
DESCRIPTION:Title: Monopoles\, Alice rings and topological interfaces in a quantum flu
id\nby Giuseppe Baio (University of East Anglia) as part of Fluids and
Structures Seminar @ UEA\n\n\nAbstract\nVortices are common natural pheno
mena\, from turbulence in fluids to atmospheric cyclones. In quantum field
s\, they can emerge with discrete values of circulation. These are topolog
ical excitations (TEs)\, predicted from symmetry arguments alone and showi
ng striking similarities\, from quantum fluids\, to condensed matter physi
cs and cosmology. Advancements in ultracold atomic physics are prospecting
the controlled creation of previously inaccessible TEs in magnetic quantu
m fluids known as spinor Bose-Einstein condensates (BECs).\n\nIn this semi
nar\, I will address TEs and their dynamics in a spin-2 BECs\, where the r
ich variety of order-parameter symmetries allows exotic phenomena such as
fractional vortex charges\, monopoles\, and non-singular spin textures. In
particular\, I will show how energy relaxation causes a monopole in the u
niaxial-nematic phase to deform into a spin-Alice ring\, exhibiting a comp
osite core with distinct short- and long-distance topologies [1]. Numerica
l simulations reveal dynamical oscillations between the spin-Alice ring an
d a split-core hedgehog configuration. Moreover\, I will also address TEs
and their stability across optically induced topological interfaces\, wher
e sudden topology changes occur similarly to the early-universe theories [
2].\n\n[1] Baio\, G. & Borgh M. O\, arXiv:2401.04103 (2024).\n[2] Baio\, G
. et al.\, Phys. Rev. Research 6\, 013046 (2024).\n
LOCATION:https://stable.researchseminars.org/talk/UEA_mth/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Francesco Giglio (University of Glasgow)
DTSTART:20240312T140000Z
DTEND:20240312T145000Z
DTSTAMP:20260404T100116Z
UID:UEA_mth/5
DESCRIPTION:Title: From Statistical Thermodynamics to (C-)Integrability and back\n
by Francesco Giglio (University of Glasgow) as part of Fluids and Structur
es Seminar @ UEA\n\n\nAbstract\nPhase transitions in macroscopic systems a
t the equilibrium have shown to be intimately related to the theory of non
linear conservation laws. Examples range from simple systems like van der
Waals fluids\, (uniaxial) Nematic Liquid Crystal models and spin systems t
o complex systems as Random Matrix models. In such models\, order paramete
rs fulfil suitable nonlinear PDEs with prescribed initial conditions and p
hase transitions are explained in terms of shock waves travelling in the s
pace of control parameters (e.g. thermodynamic variables). \nRestricting o
ur analysis to simple systems\, many paradigmatic models in Statistical Th
ermodynamics turn out to be C-Integrable\, that is there exists a nonlinea
r transformation which maps a non-linear PDE of hydrodynamic type associat
ed with the physical problem to a linear one. Conversely\, from a C-Integr
ability ansatz applied to first principles of Thermodynamics one can retri
eve families of models which often generalise known ones\, providing insig
hts of physical relevance. \n\nThe talk aims at discussing the connection
between Statistical Thermodynamics and C-Integrability in the context of f
luid systems\, with a special focus on recent results on biaxial Nematic L
iquid Crystals (doi: 10.1098/rspa.2023.0701). We will see that the occurre
nce of distinct thermodynamic phases in certain degenerate domains of ther
modynamic variables is identified by reductions of the underlying system o
f conservation laws. This highlights the importance of developing solid ma
thematical and theoretical tools to extend simple thermodynamic models and
construct more general ones.\n
LOCATION:https://stable.researchseminars.org/talk/UEA_mth/5/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ioannis Karmpadakis (Imperial College London)
DTSTART:20240319T140000Z
DTEND:20240319T145000Z
DTSTAMP:20260404T100116Z
UID:UEA_mth/6
DESCRIPTION:Title: The statistics of waves over planar coastal beaches: Theory and Exp
eriments\nby Ioannis Karmpadakis (Imperial College London) as part of
Fluids and Structures Seminar @ UEA\n\nLecture held in TPSC 2.05A.\n\nAbst
ract\nThe magnitude and characteristics of waves in the coastal zone is of
critical importance for the design and operation of most engineering appl
ications. These include topics such as the prediction of coastal erosion a
nd flooding\, the design of engineering solutions and the development of n
earshore marine renewable devices and offshore wind turbines. With the aim
to inform these applications\, this work will present recent findings on
the accurate modelling and understanding of coastal processes.\n\nRather t
han focusing solely on regular wave patterns\, this work delves into the s
tatistical representation of random wave variables\, a crucial aspect ofte
n overlooked in traditional analyses. To achieve this\, an extensive datas
et comprising long random wave simulations was generated at the Hydrodynam
ics Laboratory of Imperial College London. By parametrically exploring a b
road parameter range of incident storm conditions across three distinct pl
anar beach bathymetric profiles\, we aim to provide comprehensive insights
into coastal wave evolution. High-resolution analysis of water surface el
evations\, covering the entire length of the beach and encompassing over h
alf a million waves per location\, was conducted. Additionally\, numerical
investigations employing a phase-resolving\, non-hydrostatic model (SWASH
) were performed to validate the findings.\n\nComparative analyses between
our datasets and existing theoretical frameworks shed light on the distri
bution of wave heights and crest heights. Furthermore\, we investigate the
interplay between nonlinear wave evolution\, wave breaking\, and the unde
rlying topography of the problem. The present work highlights some dispari
ties between theory and empirical measurements but also offers valuable ph
ysical insights. These insights\, coupled with practical considerations ta
ilored for engineers\, aim to facilitate more accurate and effective coast
al engineering solutions.\n
LOCATION:https://stable.researchseminars.org/talk/UEA_mth/6/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alice Thompson (University of Manchester)
DTSTART:20240430T130000Z
DTEND:20240430T135000Z
DTSTAMP:20260404T100116Z
UID:UEA_mth/7
DESCRIPTION:Title: Feedback control and continuation for deformable bubbles\nby Al
ice Thompson (University of Manchester) as part of Fluids and Structures S
eminar @ UEA\n\n\nAbstract\nIn this talk\, I explore how feedback control
and control-based continuation (CBC) can be used to both stabilize and det
ect unstable steady states in physical experiments. CBC aims to create exp
erimental equivalents of numerical methods such as tracking steady states
and bifurcations which would otherwise not be possible in experiments. He
re I describe our recent work on using CBC to explore bubble deformation i
n Hele-Shaw cells – the first such application of CBC in free-surface fl
uid mechanics. For the case of a propagating bubble (a Saffman-Taylor bubb
le)\, we use a numerical simulation of the system to develop a control str
ategy and act as a numerical experiment. We show how CBC protocols can be
used to detect the unstable double-tipped propagating bubble state in nonl
inear simulations\, for both moving actuators and a more realistic setup i
nvolving an array of fixed-position actuators. Finally\, I will also discu
ss some of our recent laboratory experimental results for using CBC for no
n-propagating bubbles placed in a straining flow\, where we have successfu
lly tracked both singly- and doubly-unstable steady branches connected via
a limit point associated with bubble breakup.\n
LOCATION:https://stable.researchseminars.org/talk/UEA_mth/7/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jia Chen (University of York)
DTSTART:20240514T130000Z
DTEND:20240514T135000Z
DTSTAMP:20260404T100116Z
UID:UEA_mth/8
DESCRIPTION:Title: Estimation of Large Dynamic Precision Matrices with a Latent Semipa
rametric Structure\nby Jia Chen (University of York) as part of Fluids
and Structures Seminar @ UEA\n\nLecture held in SCI 1.50.\n\nAbstract\nTh
is paper studies the estimation of dynamic precision matrices of high-dime
nsional time series satisfying an approximate factor model with multiple c
onditioning variables. We introduce an easy-to-implement semiparametric me
thod to estimate each entry of the conditional covariance matrices of the
common factors and the idiosyncratic components via Model Averaging MArgin
al Regression (MAMAR). We apply the CLIME method to obtain the estimate of
the dynamic precision matrix for the idiosyncratic components and then we
utilise the Sherman-Morrison-Woodbury formula to obtain the dynamic preci
sion matrix for the time series. Under some regularity conditions\, we der
ive the uniform consistency for the proposed estimators. We provide a simu
lation study that illustrates the finite-sample performance of the develop
ed methodology and then apply the proposed method in construction of the m
inimum variance portfolio from daily stock returns of S\\&P 500 index cons
tituents in 2022.\n
LOCATION:https://stable.researchseminars.org/talk/UEA_mth/8/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Maria Di Paolo (University of East Anglia)
DTSTART:20240521T130000Z
DTEND:20240521T135000Z
DTSTAMP:20260404T100116Z
UID:UEA_mth/9
DESCRIPTION:Title: Effects of ocean tidal mixing on exoplanet climates and habitabilit
y\nby Maria Di Paolo (University of East Anglia) as part of Fluids and
Structures Seminar @ UEA\n\nLecture held in EFRY 1.01.\n\nAbstract\nDue t
o their abundance and their observational advantages\, red dwarfs offer th
e best chance of finding habitable planets through sheer numbers. Potentia
lly habitable planets in these systems orbit close to their host star and
are therefore subjected to strong tidal forcings. Oceans have an important
impact on planetary climate\, so understanding their effects is a necessa
ry part of modelling terrestrial exoplanets in order to understand future
observations. Taking into account the impact of ocean tides can lead to si
gnificant effects on planetary climate. \n\nWe have conducted studies with
an intermediate complexity coupled atmosphere-ocean general circulation m
odel (FORTE2.0). We investigated the case of non synchronous terrestrial p
lanets in close orbits in the habitable zone of their red host star. By co
nsidering scenarios in which the magnitude of tidal forcings varies over a
range of values\, we were able to determine that key quantities such as t
emperature and overturning circulation strength are affected by tidal stre
ngth.\n\nWe examined how climates corresponding to different ocean tidal m
ixing respond to a decrease of the incoming stellar flux. We found that th
e outcome of these simulations is highly dependent on the ocean tidal mixi
ng: for a fixed value of stellar flux\, a different magnitude of tidally d
riven mixing can lead to either snowball planets or to temperate worlds.\n
LOCATION:https://stable.researchseminars.org/talk/UEA_mth/9/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Takuji Waseda (University of Tokyo)
DTSTART:20240415T140000Z
DTEND:20240415T145000Z
DTSTAMP:20260404T100116Z
UID:UEA_mth/10
DESCRIPTION:Title: A large scale breakup of land-fast ice by waves in Antarctica\
nby Takuji Waseda (University of Tokyo) as part of Fluids and Structures S
eminar @ UEA\n\nLecture held in SCI 0.31.\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/UEA_mth/10/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Prof. Mark Cooker (University of East Anglia)
DTSTART:20241008T120000Z
DTEND:20241008T130000Z
DTSTAMP:20260404T100116Z
UID:UEA_mth/11
DESCRIPTION:Title: Inside the envelope\nby Prof. Mark Cooker (University of East
Anglia) as part of Fluids and Structures Seminar @ UEA\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/UEA_mth/11/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dr. Alberto Villois (University of East Anglia)
DTSTART:20241015T120000Z
DTEND:20241015T130000Z
DTSTAMP:20260404T100116Z
UID:UEA_mth/12
DESCRIPTION:Title: Solitary Waves in Superfluids and Their Connection to the Origin o
f Drag\nby Dr. Alberto Villois (University of East Anglia) as part of
Fluids and Structures Seminar @ UEA\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/UEA_mth/12/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dr. Jack Keeler (University of East Anglia)
DTSTART:20241022T120000Z
DTEND:20241022T130000Z
DTSTAMP:20260404T100116Z
UID:UEA_mth/13
DESCRIPTION:Title: Navigating phase-space: The dynamical systems approach to fluid dy
namics\nby Dr. Jack Keeler (University of East Anglia) as part of Flui
ds and Structures Seminar @ UEA\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/UEA_mth/13/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tatiana Khabakhpasheva (UEA)
DTSTART:20241029T130000Z
DTEND:20241029T140000Z
DTSTAMP:20260404T100116Z
UID:UEA_mth/14
DESCRIPTION:Title: Elastic impact onto a liquid surface: Stresses\, Pressure\, Dynami
c Amplification Factor\nby Tatiana Khabakhpasheva (UEA) as part of Flu
ids and Structures Seminar @ UEA\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/UEA_mth/14/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Josh Shelton (Bath)
DTSTART:20241105T130000Z
DTEND:20241105T140000Z
DTSTAMP:20260404T100116Z
UID:UEA_mth/15
DESCRIPTION:Title: Beyond-all-order asymptotics in the equatorial Kelvin wave and fre
e surface water waves\nby Josh Shelton (Bath) as part of Fluids and St
ructures Seminar @ UEA\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/UEA_mth/15/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thomasina Ball (Warwick)
DTSTART:20241112T130000Z
DTEND:20241112T140000Z
DTSTAMP:20260404T100116Z
UID:UEA_mth/16
DESCRIPTION:Title: Wrinkles and creases in thin layers of viscoplastic fluid\nby
Thomasina Ball (Warwick) as part of Fluids and Structures Seminar @ UEA\n\
nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/UEA_mth/16/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Xin Guan (Imperial College London)
DTSTART:20250218T130000Z
DTEND:20250218T140000Z
DTSTAMP:20260404T100116Z
UID:UEA_mth/17
DESCRIPTION:Title: Evolution of vortex sheets under a horizontal electric field\n
by Xin Guan (Imperial College London) as part of Fluids and Structures Sem
inar @ UEA\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/UEA_mth/17/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ellen Luckins (University of Warwick)
DTSTART:20250225T130000Z
DTEND:20250225T140000Z
DTSTAMP:20260404T100116Z
UID:UEA_mth/18
DESCRIPTION:Title: Modelling drying porous media\nby Ellen Luckins (University of
Warwick) as part of Fluids and Structures Seminar @ UEA\n\nAbstract: TBA\
n
LOCATION:https://stable.researchseminars.org/talk/UEA_mth/18/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Maria Di Paolo (University of East Anglia)
DTSTART:20251104T130000Z
DTEND:20251104T140000Z
DTSTAMP:20260404T100116Z
UID:UEA_mth/19
DESCRIPTION:Title: Climate Patterns of Spin-Orbit Resonant Exoplanets Around Low-Mass
Stars\nby Maria Di Paolo (University of East Anglia) as part of Fluid
s and Structures Seminar @ UEA\n\nLecture held in SCI 3.05.\n\nAbstract\nM
dwarfs are the most promising candidates for finding habitable worlds thr
ough atmospheric characterization. Planets in the habitable zone of low-ma
ss stars experience intense tidal forcings and often become tidally locked
. Despite the majority of research being centered on the climate dynamics
of synchronously rotating planets in this scenario\, synchronous rotation
is not an inevitable outcome of tidal locking. Several different circumsta
nces can result in an asynchronous rotation\, and in some instances can le
ad to spin-orbit resonances (SORs).\nIn this talk\, we will explore the cl
imates of two different 3:2 SOR scenarios with a coupled atmosphere-ocean
general circulation model. Given the crucial role played by the oceans in
shaping planetary climate\, we adopt two different ocean tidal forcing par
ameterizations for each SOR scenario. Each of these cases are simulated wi
th both a dynamical ocean and a thermodynamical ocean.\nOur findings revea
l striking differences between the analyzed resonant cases and the commonl
y studied synchronous cases. Periodic climate patterns are observed\, with
climatic features such as clouds and rainfall exhibiting a 60° longitudi
nal shift relative to the substellar point. The evolution of quantities su
ch as the planetary thermal emission during a stellar period is potentiall
y noteworthy from the observational point of view.\n
LOCATION:https://stable.researchseminars.org/talk/UEA_mth/19/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tommy Moorcroft (University of East Anglia)
DTSTART:20250304T130000Z
DTEND:20250304T140000Z
DTSTAMP:20260404T100116Z
UID:UEA_mth/20
DESCRIPTION:Title: The meta-stable and stable thermal equilibrium of a photonic mesh
lattice\nby Tommy Moorcroft (University of East Anglia) as part of Flu
ids and Structures Seminar @ UEA\n\n\nAbstract\nn the limit of short optic
al pulses\, an optical double loop experiment can be modelled using a phot
onic mesh lattice describing a system of coupled wave fields in discrete s
pace and time. For an alternating phase modulation\, the photonic mesh lat
tice possesses a linear dispersion relation with two bands that are comple
tely isolated. Here we study the process of thermalisation of a single ba
nd\, using the framework of weak wave turbulence. Previous experimental an
d numerical observations suggest that for single band excitation\, a Rayle
igh-Jeans distribution is observed among the normal modes\, seeming to rea
ch a thermal equilibrium [1]. However\, for longer time scales\, a power l
eakage process occurs destabilising the single band Rayleigh-Jeans. Eventu
ally the power is equally split between bands\, reaching a full thermal eq
uilibrium in both bands simultaneously\, with the total linear energy tend
ing to zero. As a consequence of this\, the temperature and chemical poten
tial are now dependent on one another and cannot be arbitrarily chosen.\n\
n[1] A. L. Marques Muniz and F. O. Wu and P. S. Jung and M. Khajavikhan an
d D. N. Christodoulides and U. Peschel : Observation of photon-photon ther
modynamic processes under negative optical temperature conditions Science
379 n.6636\, 1019-1023 (2023)\n
LOCATION:https://stable.researchseminars.org/talk/UEA_mth/20/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Swapnadip De Chowdhury (IIT Kharagpur)
DTSTART:20250704T120000Z
DTEND:20250704T130000Z
DTSTAMP:20260404T100116Z
UID:UEA_mth/21
DESCRIPTION:Title: Recent progress in development of novel marine renewable energy sy
stems\nby Swapnadip De Chowdhury (IIT Kharagpur) as part of Fluids and
Structures Seminar @ UEA\n\nLecture held in SCI 0.66.\n\nAbstract\nClimat
e change stands out as the foremost challenge confronting the 21st century
\, and it’s imperative to address it within the next 20 to 30 years to a
vert irreversible alterations to our ecosystem and mitigate effects on the
human population. Urgency and significance underscore the need to harness
alternative energy sources\, displacing reliance on fossil fuels while en
suring energy security. Despite being an underused asset\, renewable energ
y holds immense promise\, potentially satisfying a notable percentage of g
lobal energy demands by 2050.\nI will discuss the modelling of arrays of w
ave energy converters\, particularly in coastal waters. Devices in coastal
waters are cost-effective measures that can achieve power generation whil
e also ensuring coastal protection. The work is underpinned by mathematica
l modelling of an Elastically Moored Flexible Multibody Wave Energy Conver
ter. Full linear (potential flow) theory is the standard benchmark for mod
el predictions of hydrodynamics of floating bodies and wave interactions b
etween the bodies. Solutions are typically obtained in the frequency domai
n\, where the equations of motion for the bodies can be written in the for
m of a coupled damped harmonic oscillator (CDHO) model\, but with frequenc
y dependent coefficients owing to the coupling with the water.\n
LOCATION:https://stable.researchseminars.org/talk/UEA_mth/21/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Susam Boral (Trinity College Dublin)
DTSTART:20250822T120000Z
DTEND:20250822T130000Z
DTSTAMP:20260404T100116Z
UID:UEA_mth/22
DESCRIPTION:Title: Time-Domain Analysis of Periodic Dynamics in Flexible Submarine Ca
bles\nby Susam Boral (Trinity College Dublin) as part of Fluids and St
ructures Seminar @ UEA\n\nLecture held in SCI 1.20.\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/UEA_mth/22/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Davide Proment (University of East Anglia)
DTSTART:20251209T130000Z
DTEND:20251209T140000Z
DTSTAMP:20260404T100116Z
UID:UEA_mth/23
DESCRIPTION:Title: Roberts-Jones solitary waves on the two-dimensional sphere\nby
Davide Proment (University of East Anglia) as part of Fluids and Structur
es Seminar @ UEA\n\nLecture held in SCI 0.31.\n\nAbstract\nRoberts-Jones s
olitary waves\, also known as Roberts-Jones solitons\, are fully nonlinear
\, localised traveling wave solutions of the Gross-Pitaevskii equation in
two and three spatial dimensions [1]. At low speeds\, these waves manifest
as vortex dipoles in two dimensions and vortex rings in three dimensions\
, creating topological excitations in the field’s phase. As the wave spe
ed approaches a critical value\, the vortex structure vanishes\, leaving b
ehind a simple dip in the field’s amplitude.\n \nIn this work\, we explo
re the existence and stability of Roberts-Jones solitary waves in curved s
patial geometries\, specifically on the two-dimensional sphere. We compare
these solitonic structures with delocalised Bogoliubov excitations\, shed
ding light on their role in novel experimental realisations of ultracold a
tomic gases confined within spherical shells. Our findings offer new insig
hts into the interplay between geometry and nonlinear wave dynamics in qua
ntum fluids.\n
LOCATION:https://stable.researchseminars.org/talk/UEA_mth/23/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ian Roberts (Aerotex)
DTSTART:20260209T160000Z
DTEND:20260209T170000Z
DTSTAMP:20260404T100116Z
UID:UEA_mth/24
DESCRIPTION:Title: In-flight icing – the challenges of high-speed droplet impingeme
nt and surface flows\nby Ian Roberts (Aerotex) as part of Fluids and S
tructures Seminar @ UEA\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/UEA_mth/24/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Eric Hester (University of Bath)
DTSTART:20260224T130000Z
DTEND:20260224T140000Z
DTSTAMP:20260404T100116Z
UID:UEA_mth/25
DESCRIPTION:Title: Automating Differential Geometry For Fluid Mechanics\nby Eric
Hester (University of Bath) as part of Fluids and Structures Seminar @ UEA
\n\n\nAbstract\nPhysical laws are coordinate-invariant\, but practical com
putations are not. Good coordinates and frames can vastly simplify calcula
tions\, speeding up numerical simulations as well as facilitating rigorous
proofs. But this doesn't make them easy to use. Though the chain rule and
vector calculus are sufficient in principle\, problems involving nonstand
ard geometries\, curvilinear coordinates\, or moving interfaces can rapidl
y spiral in complexity. Coordinate expansions become a major source of err
ors and lost time. Computer algebra systems help\, but functionality for g
eneral geometries isn't "out-of-the-box". Other higher-level packages like
xAct are powerful\, but are often designed for index calculations in gene
ral relativity rather than typical continuum-mechanics PDEs with boundarie
s and constraints. There is a missing middle of tools to automatically con
vert systems of PDEs on nonstandard geometries to their concrete component
forms.\n\nI will introduce a small Mathematica package\, Tensors\, that a
ims to close this gap. Given coordinate mappings\, tensor fields\, frames\
, and metrics on manifolds and their boundaries\, the package automaticall
y translates expressions composed of standard differential operators and g
eometric data (e.g. gradients\, integrals\, curvatures\, normals etc.) int
o component form. Automating this conversion makes complex geometric calcu
lations faster\, more reproducible\, and easier to generalise. I will illu
strate with an application from multiphase fluid dynamics\, showing how th
e package streamlines geometric constructions needed for high-order asympt
otics\, leading to better-conditioned\, complexity-optimal solvers for fre
e-boundary problems.\n
LOCATION:https://stable.researchseminars.org/talk/UEA_mth/25/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mark Blyth (UEA)
DTSTART:20260428T120000Z
DTEND:20260428T130000Z
DTSTAMP:20260404T100116Z
UID:UEA_mth/26
DESCRIPTION:Title: Kuzmak’s method - tour de force or tour de farce?\nby Mark B
lyth (UEA) as part of Fluids and Structures Seminar @ UEA\n\nLecture held
in SCI 3.05.\n\nAbstract\nIn 1959 Kuzmak introduced a new method for const
ructing asymptotic solutions to ordinary differential equations that descr
ibe nonlinear oscillators. The approach is effectively a nonlinear variant
of the WKB method. Kuzmak's method was later refined by Luke (1966) and c
an be viewed as a precursor to Whitham Modulation Theory for nonlinear wav
es. The method appears to be not so well known. In this talk we will show
how it can be applied using the example of the simple\, damped pendulum.
As is well known\, with no damping the problem can be solved exactly using
elliptic functions\, and the oscillation period depends on the amplitude
(i.e. the oscillations are non-isochronous). With damping active\, the bas
ic asymptotic approach is one of multiple scales\, with the fast time scal
e describing the oscillations and the slow time scale describing the gradu
al diminution in amplitude as energy slowly leaks away. In a key step\, th
e fast time scale is chosen to effectively fix the oscillation period\, an
d this allows a bounded solution to be constructed. We show how the key el
ements of the method work\, providing sufficient details to fully construc
t the leading order solution.\n
LOCATION:https://stable.researchseminars.org/talk/UEA_mth/26/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Simon Cox (Aberystwyth University)
DTSTART:20260526T120000Z
DTEND:20260526T130000Z
DTSTAMP:20260404T100116Z
UID:UEA_mth/27
DESCRIPTION:by Simon Cox (Aberystwyth University) as part of Fluids and St
ructures Seminar @ UEA\n\nLecture held in SCI 3.05.\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/UEA_mth/27/
END:VEVENT
END:VCALENDAR