BEGIN:VCALENDAR
PRODID:-//PSU Mathematics Department//Seminar iCalendar Generator//EN
VERSION:2.0
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-WR-CALNAME:Computational and Applied Mathematics Colloquium
X-WR-TIMEZONE:America/New_York
BEGIN:VTIMEZONE
TZID:America/New_York
X-LIC-LOCATION:America/New_York
BEGIN:DAYLIGHT
TZOFFSETFROM:-0500
TZOFFSETTO:-0400
TZNAME:EDT
DTSTART:19700308T020000
RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=2SU
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:-0400
TZOFFSETTO:-0500
TZNAME:EST
DTSTART:19701101T020000
RRULE:FREQ=YEARLY;BYMONTH=11;BYDAY=1SU
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150105T143000
DTEND;TZID=America/New_York:20150105T153000
LOCATION:MB106
URL:http://www.math.psu.edu/seminars/meeting.php?id=25557
SUMMARY:Computational and Applied Mathematics Colloquium - TBA
DESCRIPTION:Seminar: Computational and Applied Mathematics Colloquium\nTitl
e: TBA\nAbstract Link: http://
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150112T143000
DTEND;TZID=America/New_York:20150112T153000
LOCATION:MB106
URL:http://www.math.psu.edu/seminars/meeting.php?id=25558
SUMMARY:Computational and Applied Mathematics Colloquium - Geological Stora
ge of CO2: Modeling approaches for large-scale simulation
DESCRIPTION:Seminar: Computational and Applied Mathematics Colloquium\nTitl
e: Geological Storage of CO2: Modeling approaches for large-scale simulati
on\nSpeaker: Jan Nordbotten\, University of Bergen (Host: L. Zikatanov)\nA
bstract: We discuss the challenges of large-scale simulation for CO2 stora
ge. In particular\, we will emphasize some of the fundamental challenges a
ssociated with the scale of the problem\, and illustrate their impact on t
raditional numerical simulation techniques. Furthermore\, we will discuss
how multi-scale formalism can be exploited to yield large-scale models of
conceptual and practical interest.
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150119T143000
DTEND;TZID=America/New_York:20150119T153000
LOCATION:MB106
URL:http://www.math.psu.edu/seminars/meeting.php?id=25559
SUMMARY:Computational and Applied Mathematics Colloquium - TBA
DESCRIPTION:Seminar: Computational and Applied Mathematics Colloquium\nTitl
e: TBA\nSpeaker: Martin Luther King Day - No Classes
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150126T143000
DTEND;TZID=America/New_York:20150126T153000
LOCATION:MB106
URL:http://www.math.psu.edu/seminars/meeting.php?id=25560
SUMMARY:Computational and Applied Mathematics Colloquium - Modeling Blood C
ell-Substrate Interaction and Biofilm-Fluid Interaction
DESCRIPTION:Seminar: Computational and Applied Mathematics Colloquium\nTitl
e: Modeling Blood Cell-Substrate Interaction and Biofilm-Fluid Interaction
\nSpeaker: Zhiliang Xu\, University of Notre Dame (Host: C Liu)\nAbstract:
In this talk\, two different models will be discussed. The first model is
for studying blood cell-environment interaction\, specially platelet-bloo
d vessel wall interaction. Platelets aggregation at the injury site of the
blood vessel occurring via platelet-platelet adhesion\, tethering and rol
ling on the injured endothelium is a critical initial step in blood clot f
ormation. To understand this critical step\, a hybrid model is developed t
o represent membranes of biological cells and the distributed-Lagrange-mul
tiplier/fictitious-domain (DLM/FD) formulation is used for simulating the
fluid-cell interactions. For modeling cell-substrate adhesion\, a stochas
tic receptor-ligand binding submodel is used. In the second part of the ta
lk\, a biofilm model which systemically couples bacterial\, extracellular
polymeric substances (EPS) and solvent phases in biofilm will be discusse
d. The model is derived by using energetic variational approach and phase-
field method coupling different phases together. An unconditionally energy
-stable numerical splitting scheme is implemented for computing numerical
solution of the model efficiently.
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150202T143000
DTEND;TZID=America/New_York:20150202T153000
LOCATION:MB106
URL:http://www.math.psu.edu/seminars/meeting.php?id=25561
SUMMARY:Computational and Applied Mathematics Colloquium - Chemistry and Bi
ology Need Variational Models
DESCRIPTION:Seminar: Computational and Applied Mathematics Colloquium\nTitl
e: Chemistry and Biology Need Variational Models\nSpeaker: Bob Eisenberg\,
Rush Medical Center (Host: J Xu)\nAbstract: Mathematics is responsible fo
r most of our standard of living\, but no one seems to know that. The quan
titatively reliable calculations of structural mechanics makes tall buildi
ngs possible\; the quantitatively reliable calculations of fluid mechanics
makes airplanes possible (as well as plumbing)\; most importantly the qua
ntitatively reliable calculations of electronics makes our semiconductor t
echnology possible\, and that has remade our lives. Our computer technolog
y is one billion times more capable than when I was a graduate student! Wi
thout PNP (called drift diffusion in computational electronics)\, semicond
uctor technology would be crippled. Indeed\, it would not exist.\n\nMathem
atics has been a much less reliable guide in chemistry and biology. Biolog
ical sciences are almost entirely sophisticated trial and error. Chemical
sciences use mathematics more to interpret than design. Chemical models mu
st change parameters in ways that cannot be predicted as conditions change
. Chemical models are rarely “transferrable” to use their language.\n
\nThe ‘law of mass action’ is the foundation of most chemical and biol
ogical theory\, because it seems a simple statement of conservation of mas
s. The law of mass action leads to models that cannot be used in more than
one set of conditions\, in most cases. The law of mass action is incompat
ible with the laws of electricity. It does not conserve charge movement be
cause it does not deal with charge at all. Models built ONLY on the law of
mass action are local. Electrical behavior and its laws are global. Very
specifically\, everyone knows that “current flows in loops”. Everyone
knows that interruptions in current flow anywhere in a series of reactions
interrupts the flow everywhere. Schemes built only from the law of mass a
ction (conservation of matter as used in chemical theory) do not have this
property.\n\nVariational methods can deal with global interacting systems
like these. Variational methods can combine conservation laws for mass an
d electric current. But those methods have not been available for dissipat
ive systems. Mathematics of chemistry and biology must deal with dissipati
on\, because friction is everywhere in condensed phases. There is no empty
space in condensed phases\, so when something moves\, it collides and dis
sipates energy into the randomized motion we call heat.\n\nVariational met
hods have now been extended to include dissipative systems\, like those fo
und throughout biology and chemistry\, thanks to Chun Liu\, more than anyo
ne else. I will show in detail how current flow in a wide variety of syste
ms needs such mathematics. I will show our variational model of ions in so
lutions and in biological molecules called ion channels.\n\nI will seek he
lp in solving these models and converting them into specific predictions o
f experiments.\n\nMathematics in chemistry and biology promises to make mo
dels as reliable as those of semiconductors. Technological progress will v
astly accelerate in biology and nanosciences\, include chemistry\, when tr
ial and error experimentation can be catalyzed by models that are quantita
tively reliable.
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150209T143000
DTEND;TZID=America/New_York:20150209T153000
LOCATION:MB106
URL:http://www.math.psu.edu/seminars/meeting.php?id=25562
SUMMARY:Computational and Applied Mathematics Colloquium - Transport type p
roblems in bounded domains
DESCRIPTION:Seminar: Computational and Applied Mathematics Colloquium\nTitl
e: Transport type problems in bounded domains\nSpeaker: Nikolai Chementov
\, Lisbon\, Portugal (Hostess: A Mazzucato)\nAbstract: In this talk\, we w
ill present an overview of results\, related with transport type problems
\, considered in bounded domains. We present two principal ideas: "renorma
lization property" and "Green's theorem"\, which are used in the study of
these problems. These two ideas permit to solve di?erent transport type pr
oblems\, such as:\n1) Euler equations in the bounded domain\n2) the bounda
ry layer problem\n3) Buckley-Leverett-Brinkman problem for the porous medi
a.
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150216T143000
DTEND;TZID=America/New_York:20150216T153000
LOCATION:MB106
URL:http://www.math.psu.edu/seminars/meeting.php?id=25563
SUMMARY:Computational and Applied Mathematics Colloquium - Spatially explic
it theory of partial migration evolution
DESCRIPTION:Seminar: Computational and Applied Mathematics Colloquium\nTitl
e: Spatially explicit theory of partial migration evolution\nSpeaker: Tim
Reluga\, Penn State University
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150223T143000
DTEND;TZID=America/New_York:20150223T153000
LOCATION:MB106
URL:http://www.math.psu.edu/seminars/meeting.php?id=25567
SUMMARY:Computational and Applied Mathematics Colloquium - Stability and mo
notonicity in the low order discretizations of Biot’s model
DESCRIPTION:Seminar: Computational and Applied Mathematics Colloquium\nTitl
e: Stability and monotonicity in the low order discretizations of Biot’s
model\nSpeaker: Ludmil Zikatanov\, Penn State University\nAbstract: We co
nsider a finite element discretizations of the Biot's model in poroelastic
ity with lowest order finite elements: MINI element\; stabilized P1-P1 ele
ment and Crouzeix-Raviart-P0 element. We address the issue related to the
presence of non-physical oscillations in the pressure approximations for
low permeabilities and/or small time steps. We show that in some cases\, e
ven in 1D\, Stokes-stable finite element pair does not provide a monotone
discretization for low permeabilities. We then introduce a stabilization t
erm which removes the oscillations. We present numerical results confirmin
g the monotone behavior of the stabilized schemes.
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150302T143000
DTEND;TZID=America/New_York:20150302T153000
LOCATION:MB106
URL:http://www.math.psu.edu/seminars/meeting.php?id=25565
SUMMARY:Computational and Applied Mathematics Colloquium - Generalized Pois
son Boltzmann and Differential Capacitance data: an inverse problem
DESCRIPTION:Seminar: Computational and Applied Mathematics Colloquium\nTitl
e: Generalized Poisson Boltzmann and Differential Capacitance data: an inv
erse problem\nSpeaker: Nir Gavish\, Technion – Israel Institute of Techn
ology (Host: C Liu)\nAbstract: The contact between a charged object (metal
surface\, macromolecule\, membrane\, etc.) and an electrolyte solution re
sults in the rearrangement of ion distribution near the interface and form
ation of the so-called electrical double layer. One of the important expe
rimentally available quantities for characterising the structure of electr
olyte solutions near such interfaces are differential capacitance measurem
ents. From a mathematical point of view\, the double layer structure is c
ommonly modelled by the Poisson-Boltzmann equation and generalizations of
it.\n\nIn this work\, we conduct a systematic study of the differential ca
pacitance data. In particular\, we focus on the inverse problem: Given di
fferential capacitance data\, we ask whether it is possible to derive a ge
neralized Poisson-Boltzmann model which gives rise to the prescribed data.
We show that such models do exist\, characterise their variational actio
n in terms of a PDE\, and provide a method for solving the PDE and derivin
g the appropriate generalized Poisson-Boltzmann model. This method does n
ot yield a unique model\, and so we find that a wide class of models can g
ive rise to the same differential capacitance data.\n\nUsing our method\,
we derive generalized Poisson-Boltzmann models from differential capacitan
ce data coming from either theoretical models or experimental measurements
. In particular\, derive novel models which accurately recover experiment
al data.\n\nThis is a joint work with Keith Promislow.
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150309T143000
DTEND;TZID=America/New_York:20150309T153000
LOCATION:MB106
URL:http://www.math.psu.edu/seminars/meeting.php?id=25566
SUMMARY:Computational and Applied Mathematics Colloquium - TBA
DESCRIPTION:Seminar: Computational and Applied Mathematics Colloquium\nTitl
e: TBA\nSpeaker: Spring Break\, No Classes
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150316T143000
DTEND;TZID=America/New_York:20150316T153000
LOCATION:MB106
URL:http://www.math.psu.edu/seminars/meeting.php?id=25564
SUMMARY:Computational and Applied Mathematics Colloquium - Mathematical Mod
eling of Micromagnetic Complex Fluids
DESCRIPTION:Seminar: Computational and Applied Mathematics Colloquium\nTitl
e: Mathematical Modeling of Micromagnetic Complex Fluids\nSpeaker: Johanne
s Forster\, University of Wuerzburg (Host: C Liu)\nAbstract: Magnetic flui
ds (ferrofluids) have many technological applications. They can not only b
e found in medical applications\, but also in loud speakers and shock abso
rbers. We investigate magnetic fluids with micromagnetic particles in the
framework of complex fluids. From a continuum mechanical setting and an en
ergetic ansatz for the material\, we derive PDEs to describe their behavio
r. We outline the process of modeling and the energetic variational approa
ch. Moreover\, we highlight the mathematical problems that arise in the es
tablishment of the PDEs. This is joint work with Carlos Garcia-Cervera (M
athematics Department\, University of California\, Santa Barbara\, USA)\,
Chun Liu (Department of Mathematics\, Penn State University\, University P
ark\, USA)\, and Anja Schloemerkemper (Institute for Mathematics\, Univers
ity of Wuerzburg\, Germany).
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150323T143000
DTEND;TZID=America/New_York:20150323T153000
LOCATION:MB106
URL:http://www.math.psu.edu/seminars/meeting.php?id=25568
SUMMARY:Computational and Applied Mathematics Colloquium - An introduction
to the Vlasov-Poisson system
DESCRIPTION:Seminar: Computational and Applied Mathematics Colloquium\nTitl
e: An introduction to the Vlasov-Poisson system\nSpeaker: Daniel Han-Kwan
\, Ecole Polytechnique\, France (Hosts: A Bressan and T Nguyen)\nAbstract:
The Vlasov-Poisson system is a classical model of plasma physics\, used t
o describe the dynamics in phase space of interacting charged particles. W
e shall review in this lecture some remarkable mathematical properties of
this system. The topics reviewed should include (1) the existence of weak
or strong solutions\, (2) the stability and instability theory of certain
equilibria\, (3) the quasineutral limit\, i.e. the regime when the Debye l
ength is small compared to the typical observation length.
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150330T143000
DTEND;TZID=America/New_York:20150330T153000
LOCATION:MB106
URL:http://www.math.psu.edu/seminars/meeting.php?id=25569
SUMMARY:Computational and Applied Mathematics Colloquium - Incompressible N
-Phase Flows: Physical Formulation and Numerical Algorithm
DESCRIPTION:Seminar: Computational and Applied Mathematics Colloquium\nTitl
e: Incompressible N-Phase Flows: Physical Formulation and Numerical Algori
thm\nSpeaker: Suchuan Steven Dong\, Purdue University (Host: J Xu)\nAbstra
ct: This talk focuses on simulating the motion of a mixture of N (N>=2) im
miscible incompressible fluids with given densities\, dynamic viscosities
and pairwise surface tensions. We present an N-phase formulation within th
e phase field framework that is thermodynamically consistent\, in the sens
e that the formulation satisfies the conservations of mass/momentum\, the
second law of thermodynamics and Galilean invariance. In addition\, we als
o present an efficient algorithm for numerically simulating the N-phase sy
stem that has overcome the issues caused by the variable mixture density/v
iscosity and the couplings among the (N-1) phase field variables and the f
low variables. We compare simulation results with the Langmuir-de Gennes t
heory to demonstrate that the presented method produces physically accurat
e results for multiple fluid phases. Numerical experiments will be present
ed for several problems involving multiple fluid phases\, large density co
ntrasts and large viscosity contrasts to demonstrate the capabilities of t
he method for studying the interactions among multiple types of fluid inte
rfaces.
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150406T143000
DTEND;TZID=America/New_York:20150406T153000
LOCATION:MB106
URL:http://www.math.psu.edu/seminars/meeting.php?id=25570
SUMMARY:Computational and Applied Mathematics Colloquium - Boundary integra
l methods on implicitly defined interfaces
DESCRIPTION:Seminar: Computational and Applied Mathematics Colloquium\nTitl
e: Boundary integral methods on implicitly defined interfaces\nSpeaker: Ri
chard Tsai\, University of Texas\, Austin (Host: X Li)\nAbstract: I will p
resent a new approach for computing boundary integrals that are\ndefined o
n implicit interfaces\, without\nthe need of explicit parameterization.\nA
key component of this approach is a volume integral which is identical\nt
o the integral over the interface.\nI will show results applying this appr
oach to simulate interfaces that\nevolve according to Mullins-Sekerka dyn
amics used in certain phase\ntransition problems.\nI will also discuss our
latest results in generalization of this\napproach to summation of unstru
ctured point clouds and\nregularization of hyper-singular integrals.
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150413T143000
DTEND;TZID=America/New_York:20150413T153000
LOCATION:MB106
URL:http://www.math.psu.edu/seminars/meeting.php?id=25571
SUMMARY:Computational and Applied Mathematics Colloquium - Limit dynamics o
f a small solid in a perfect incompressible fluid.
DESCRIPTION:Seminar: Computational and Applied Mathematics Colloquium\nTitl
e: Limit dynamics of a small solid in a perfect incompressible fluid.\nSpe
aker: Olivier Glass\, Université Paris-Dauphine (Host: A Bressan)\nAbstra
ct: We consider a solid in a two-dimensional perfect incompressible fluid.
The fluid is driven by the classical Euler equation\, and the solid evolv
es according to Newton's law under the influence of the pressure on its su
rface. We consider the limit of the system as the solid shrinks to a point
. We obtain various different models in the limit. A first model is obtain
ed when the mass of the solid and the circulation around it are fixed\; in
that case the system converges to a variant of Marchioro and Pulvirenti's
vortex-wave system where the vortex\, placed in the point occupied by the
shrunk body\, is accelerated by a lift force similar to the Kutta-Joukows
ki force. A second one is obtained when the mass of the solid and its dens
ity are fixed\; in that case\, we recover in the limit the vortex-wave sys
tem itself.\nThese results are obtained in collaboration with Christophe L
acave (Paris-Diderot)\, Alexandre Munnier (Nancy)\, and Franck Sueur (Bord
eaux).
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150420T143000
DTEND;TZID=America/New_York:20150420T153000
LOCATION:MB106
URL:http://www.math.psu.edu/seminars/meeting.php?id=25554
SUMMARY:Computational and Applied Mathematics Colloquium - Linear Solvers f
or Reservoir Simulation problems
DESCRIPTION:Seminar: Computational and Applied Mathematics Colloquium\nTitl
e: Linear Solvers for Reservoir Simulation problems\nSpeaker: Ilya Mishev
\, ExxonMobil Upstream Research Company (Host: L Zikatanov)\nAbstract: Lin
ear solvers are usually the most time consuming part of reservoir simulati
ons. A considerable amount of research has been devoted to reducing the ti
me necessary for solving the linear system. One approach is to use an oper
ator splitting scheme that replace the fully implicit formulation with IMP
ES (Implicit Pressure Explicit Saturation) or Sequential Implicit (Implici
t Pressure followed by Implicit Saturation). The size of the linear system
s is reduced considerably and there is no coupling of hyperbolic and parab
olic features. Nevertheless\, the linear systems from the discretization o
f the pressure equation are still difficult to solve because of the size a
nd the properties of the mesh\, the heterogeneity and the anisotropy of th
e porous media. I will share my experience in development of overlapping a
nd non-overlapping Additive Schwarz Domain Decomposition preconditioners f
or solving the pressure linear systems and discuss the use of Algebraic Mu
ltiGrid.
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150427T143000
DTEND;TZID=America/New_York:20150427T153000
LOCATION:MB106
URL:http://www.math.psu.edu/seminars/meeting.php?id=25555
SUMMARY:Computational and Applied Mathematics Colloquium - Inverse Obstacle
Scattering
DESCRIPTION:Seminar: Computational and Applied Mathematics Colloquium\nTitl
e: Inverse Obstacle Scattering\nSpeaker: Rainer Kress\, University of Goet
tingen (Host: L Zikatanov)\nAbstract: We consider the inverse problem to d
etermine the shape of an obstacle from the knowledge of the far field patt
ern for scattering of time-harmonic acoustic or electromagnetic waves\, i.
e.\, an inverse boundary value problem for the Helmholtz and Maxwell equat
ions. For the sake of simplicity\, we will concentrate on the case of scat
tering from a sound-soft obstacle or a perfect conductor. We will review s
ome basics on uniqueness and ill-posedness for this inverse problem and di
scuss some more recently developed reconstruction algorithms with an empha
sis on iterative methods. The luncheon seminar will include a short survey
on the corresponding direct scattering problem. For a flavour of the topi
c see D. Colton and R. Kress\, Inverse Acoustic and Electromagnetic Scatte
ring Theory\, 3rd ed.\, Springer\, New York\, 2013. 1
END:VEVENT
END:VCALENDAR