BEGIN:VCALENDAR
PRODID:-//PSU Mathematics Department//Seminar iCalendar Generator//EN
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CALSCALE:GREGORIAN
METHOD:PUBLISH
X-WR-CALNAME:CCMA PDEs and Numerical Methods Seminar Series
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
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END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150116T153000
DTEND;TZID=America/New_York:20150116T170000
LOCATION:MB315
URL:http://www.math.psu.edu/seminars/meeting.php?id=25849
SUMMARY:CCMA PDEs and Numerical Methods Seminar Series - TBA
DESCRIPTION:Seminar: CCMA PDEs and Numerical Methods Seminar Series\nTitle:
TBA
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150123T153000
DTEND;TZID=America/New_York:20150123T170000
LOCATION:MB315
URL:http://www.math.psu.edu/seminars/meeting.php?id=25850
SUMMARY:CCMA PDEs and Numerical Methods Seminar Series - A simple finite el
ement method simulating the incompressible high Reynolds number flow and b
oundary layer separation.
DESCRIPTION:Seminar: CCMA PDEs and Numerical Methods Seminar Series\nTitle:
A simple finite element method simulating the incompressible high Reynold
s number flow and boundary layer separation.\nSpeaker: Yunhua Xue\, Nankai
University\nAbstract: In this talk\, we apply the simple finite element n
umerical scheme to simulate the vorticity-stream function formulation of t
he incompressible flow over a triangular domain and analyze its boundary l
ayer separation. Compared with many classical finite element fluid solvers
\, this method avoids a Stokes solver\, and only two Poisson-like equation
s need to be solved at each time step/state. Numerical experiments over th
is irregular domain for high Reynolds number $Re=10^4\, 10^5$ flows are in
vestigated. At same time\, the dynamical mechanism of the boundary layer s
eparation\, including the bifurcation location and critical time are quali
tatively reported.
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150130T153000
DTEND;TZID=America/New_York:20150130T170000
LOCATION:MB315
URL:http://www.math.psu.edu/seminars/meeting.php?id=25851
SUMMARY:CCMA PDEs and Numerical Methods Seminar Series - Nonlinear approxim
ation theory for the homogeneous Boltzmann equation
DESCRIPTION:Seminar: CCMA PDEs and Numerical Methods Seminar Series\nTitle:
Nonlinear approximation theory for the homogeneous Boltzmann equation\nSp
eaker: Binh Tran\, Basque Center for Applied Mathematics\, Spain\nAbstract
Link: http://www.math.univ-paris13.fr/~binh/\nAbstract: A challenging pro
blem in solving the Boltzmann equation numerically is that the velocity sp
ace is approximated by a finite region. Therefore\, most methods are based
on a truncation technique and the computational cost is then very high if
the velocity domain is large. Moreover\, sometimes\, non-physical conditi
ons have to be imposed on the equation in order to keep the velocity domai
n bounded. In this talk\, we introduce the first nonlinear approximation t
heory for the Boltzmann equation. Our nonlinear wavelet approximation is n
on-truncated and based on a nonlinear\, adaptive spectral method associate
d with a new wavelet filtering technique and a new formulation of the equa
tion. The approximation is proved to converge and perfectly preserve most
of the properties of the homogeneous Boltzmann equation. It could also be
considered as a general frame work for approximating kinetic integral equa
tions.
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150203T110000
DTEND;TZID=America/New_York:20150203T123000
LOCATION:MB114
URL:http://www.math.psu.edu/seminars/meeting.php?id=27420
SUMMARY:CCMA PDEs and Numerical Methods Seminar Series - Multiscale modelin
g using Lagrangian particle-based methods
DESCRIPTION:Seminar: CCMA PDEs and Numerical Methods Seminar Series\nTitle:
Multiscale modeling using Lagrangian particle-based methods\nSpeaker: Wen
xiao Pan\, Pacific Northwest National Laboratory\nAbstract Link: http://ww
w.pnnl.gov/science/staff/staff_info.asp?staff_num=7561\nAbstract: Lagrangi
an particle-based methods have advantages for modeling physical phenomena
involving multiphase flows\, flows with free surfaces\, advection-dominate
d flows\, complex fluids\, large-deformation of materials and soft matters
. In this talk\, I will discuss several particle-based methods including s
moothed particle hydrodynamics\, smoothed dissipative particle dynamics an
d dissipative particle dynamics. Their various applications in macroscale
and mesoscale multiphysical modeling will be demonstrated.
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150206T153000
DTEND;TZID=America/New_York:20150206T170000
LOCATION:MB315
URL:http://www.math.psu.edu/seminars/meeting.php?id=25852
SUMMARY:CCMA PDEs and Numerical Methods Seminar Series - Improved analysis
of preconditioners for GMRes method
DESCRIPTION:Seminar: CCMA PDEs and Numerical Methods Seminar Series\nTitle:
Improved analysis of preconditioners for GMRes method\nSpeaker: Yicong Ma
\, Penn State\nAbstract: Preconditioned GMRes method is an important itera
tive solver in practice. In literature\, \nfield-of-values equivalent prec
ondition has been rigorously analyzed. We improve the existing \nestimates
of the block triangular preconditioners for saddle point problems by remo
ving the scaling\nparameters which usually is difficult to choose in pract
ice. Application of such analysis to MHD system \nis also discussed.
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150213T130000
DTEND;TZID=America/New_York:20150213T143000
LOCATION:MB315
URL:http://www.math.psu.edu/seminars/meeting.php?id=25853
SUMMARY:CCMA PDEs and Numerical Methods Seminar Series - Diffuse optical to
mography and cloaking using complementary media
DESCRIPTION:Seminar: CCMA PDEs and Numerical Methods Seminar Series\nTitle:
Diffuse optical tomography and cloaking using complementary media\nSpeake
r: Loc Nguyen\, Ecole Polytechnique Federale de Lausanne\nAbstract Link: h
ttp://sma.epfl.ch/~holnguye/\nAbstract: This talk discusses some recent de
velopments in bio-medical imaging\, with applications in cancer detection
\, and invisibility cloak\, the electromagnetic theory making objects inv
isible. \n\nIn the first part of the talk\, we discuss the problem diffuse
optical tomography in the area of bio-medical imaging. It is the problem
of reconstructing the absorption coefficient of an optical body using near
-infrared light (NIR). Its most important application is breast and brain
imaging. The resolution of the resulting image is\, in general\, low.\nWe
propose a new method that achieves a significant resolution enhancement.
When a spherical acoustic wave is propagating inside the body\, the optic
al parameter is perturbed. Using the boundary measurements of the light in
tensities in both perturbed and unperturbed cases\, we can establish a ne
w equation. This equation\, together with the diffusion model\, constitute
s a nonlinear coupled system. Then\, solving iteratively such a system\, w
e obtain the true absorption parameter. Our fast and inexpensive method wi
ll be essential in building new scanning devices that safely provide high
resolution medical images. \n\nIn the second half of the talk\, I will des
cribe a cloaking device and then prove this cloaking effect in the finite
frequency regime. This is the new active trend in research\, which may pro
vide technological innovation. The main part of the cloaking device is mad
e of negative index materials (NIMs). NIMs are artificial and characterize
d by their negative electromagnetic parameters (permittivity and permeabil
ity). There are two main difficulties in the study of this problem. Due to
the presence of NIMs\, the governing equation has sign-changing coefficie
nts and\, hence\, its ellipticity is lost. Secondly\, the localized resona
nce near the inter-surface of NIMs and the object\, which we want to hide
\, might occur. These difficulties can be overcome by the reflection techn
ique\, a new three-sphere inequality and the technique of removing singula
rity. Using classical three-sphere inequalities forces the cloaking region
tends to $0$ as the frequency goes to infinity. In contrast\, our novelty
guarantees the cloaking effect for large region even with high frequencie
s.
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150220T130000
DTEND;TZID=America/New_York:20150220T143000
LOCATION:MB315
URL:http://www.math.psu.edu/seminars/meeting.php?id=25854
SUMMARY:CCMA PDEs and Numerical Methods Seminar Series - Uniformly stable d
iscontinuous Galerkin discretization and robust iterative solution methods
for the Brinkman problem
DESCRIPTION:Seminar: CCMA PDEs and Numerical Methods Seminar Series\nTitle:
Uniformly stable discontinuous Galerkin discretization and robust iterati
ve solution methods for the Brinkman problem\nSpeaker: Qingguo Hong\, Joha
nn Radon Institute\, Austrian Academy of Sciences\nAbstract: We consider r
obust iterative methods for discontinuous Galerkin (DG) H(div\,) conformin
g discretizations of the Brinkman equations. We describe a simple Uzawa it
eration for the solution of this problem\, which requires the solution of
a nearly incompressible linear elasticity type equation with mass term on
every iteration. We prove the uniform stability of the DG discretization f
or both problems. Then\, we analyze variable V-cycle and W-cycle multigrid
methods with nonnested bilinear forms. We prove that these algorithms are
robust\, and their convergence rates are independent of the parameters in
the Brinkman problem and of the mesh size. The theoretical analysis is co
nfirmed by numerical results.
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150227T130000
DTEND;TZID=America/New_York:20150227T143000
LOCATION:MB315
URL:http://www.math.psu.edu/seminars/meeting.php?id=25855
SUMMARY:CCMA PDEs and Numerical Methods Seminar Series - Constraint Precond
itioning for the Coupled Stokes-Darcy System
DESCRIPTION:Seminar: CCMA PDEs and Numerical Methods Seminar Series\nTitle:
Constraint Preconditioning for the Coupled Stokes-Darcy System\nSpeaker:
Scott Ladenheim\, Temple University\nAbstract: We propose the use of a con
straint preconditioner for the iterative solution of the linear system ari
sing from the finite element discretization of coupled Stokes-Darcy flow.
The coupled Stokes-Darcy system is a set of partial differential equations
modeling the coupling of free flow to porous media flow across an interfa
ce. The fully coupled system matrix is of saddle point form and therefore
indefinite. The constraint preconditioner is also indefinite\, mimicking t
he structure of the system matrix. We provide spectral bounds for the prec
onditioned system which are independent of the underlying mesh size. As a
result of these bounds\, the convergence of constraint preconditioned GMRE
S for this problem is fixed\, independent of the mesh size. For large-scal
e\, three dimensional flow problems\, cheaper\, inexact versions of the co
nstraint preconditioner are needed and our bounds also extend to this case
.\n\nWe present a variety of numerical experiments implemented using the d
eal.II finite element library. We consider two- and three-dimensional coup
led flow problems\, using different types of finite element schemes (conti
nuous and discontinuous Galerkin methods) as well as varying the viscosity
of the fluid and permeability of the porous medium. The numerical experim
ents illustrate that the constraint preconditioner outperforms both standa
rd block diagonal and block triangular preconditioners both with respect t
o iteration count and CPU times for the considered cases.
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150306T130000
DTEND;TZID=America/New_York:20150306T143000
LOCATION:MB315
URL:http://www.math.psu.edu/seminars/meeting.php?id=25856
SUMMARY:CCMA PDEs and Numerical Methods Seminar Series - TBA
DESCRIPTION:Seminar: CCMA PDEs and Numerical Methods Seminar Series\nTitle:
TBA
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150313T130000
DTEND;TZID=America/New_York:20150313T143000
LOCATION:MB315
URL:http://www.math.psu.edu/seminars/meeting.php?id=25857
SUMMARY:CCMA PDEs and Numerical Methods Seminar Series - TBA
DESCRIPTION:Seminar: CCMA PDEs and Numerical Methods Seminar Series\nTitle:
TBA
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150320T130000
DTEND;TZID=America/New_York:20150320T143000
LOCATION:MB315
URL:http://www.math.psu.edu/seminars/meeting.php?id=25858
SUMMARY:CCMA PDEs and Numerical Methods Seminar Series - TBA
DESCRIPTION:Seminar: CCMA PDEs and Numerical Methods Seminar Series\nTitle:
TBA\nSpeaker: Tao Huang
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150327T130000
DTEND;TZID=America/New_York:20150327T143000
LOCATION:MB315
URL:http://www.math.psu.edu/seminars/meeting.php?id=25859
SUMMARY:CCMA PDEs and Numerical Methods Seminar Series - TBA
DESCRIPTION:Seminar: CCMA PDEs and Numerical Methods Seminar Series\nTitle:
TBA
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150403T130000
DTEND;TZID=America/New_York:20150403T143000
LOCATION:MB315
URL:http://www.math.psu.edu/seminars/meeting.php?id=25860
SUMMARY:CCMA PDEs and Numerical Methods Seminar Series - TBA
DESCRIPTION:Seminar: CCMA PDEs and Numerical Methods Seminar Series\nTitle:
TBA
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150410T130000
DTEND;TZID=America/New_York:20150410T143000
LOCATION:MB315
URL:http://www.math.psu.edu/seminars/meeting.php?id=25861
SUMMARY:CCMA PDEs and Numerical Methods Seminar Series - TBA
DESCRIPTION:Seminar: CCMA PDEs and Numerical Methods Seminar Series\nTitle:
TBA
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150417T130000
DTEND;TZID=America/New_York:20150417T143000
LOCATION:MB315
URL:http://www.math.psu.edu/seminars/meeting.php?id=25862
SUMMARY:CCMA PDEs and Numerical Methods Seminar Series - TBA
DESCRIPTION:Seminar: CCMA PDEs and Numerical Methods Seminar Series\nTitle:
TBA
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150424T130000
DTEND;TZID=America/New_York:20150424T143000
LOCATION:MB315
URL:http://www.math.psu.edu/seminars/meeting.php?id=25863
SUMMARY:CCMA PDEs and Numerical Methods Seminar Series - TBA
DESCRIPTION:Seminar: CCMA PDEs and Numerical Methods Seminar Series\nTitle:
TBA
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20150501T130000
DTEND;TZID=America/New_York:20150501T143000
LOCATION:MB315
URL:http://www.math.psu.edu/seminars/meeting.php?id=25864
SUMMARY:CCMA PDEs and Numerical Methods Seminar Series - TBA
DESCRIPTION:Seminar: CCMA PDEs and Numerical Methods Seminar Series\nTitle:
TBA
END:VEVENT
END:VCALENDAR