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*'''When:''' Fridays at 2:25pm (except as otherwise indicated)
*'''When:''' Fridays at 2:25pm (except as otherwise indicated)
*'''Where:''' 901 Van Vleck Hall
*'''Where:''' 901 Van Vleck Hall
*'''Organizers:''' [http://www.math.wisc.edu/~spagnolie Saverio Spagnolie] and [http://www.math.wisc.edu/~jeanluc Jean-Luc Thiffeault]
*'''Organizers:''' [https://math.wisc.edu/staff/fabien-maurice/ Maurice Fabien], [https://people.math.wisc.edu/~rycroft/ Chris Rycroft], and [https://www.math.wisc.edu/~spagnolie/ Saverio Spagnolie],
*'''To join the ACMS mailing list:''' See [https://admin.lists.wisc.edu/index.php?p=11&l=acms mailing list] website.
*'''To join the ACMS mailing list:''' Send mail to [mailto:acms+join@g-groups.wisc.edu acms+subscribe@g-groups.wisc.edu].


<br>
<br>  


 
== '''Spring 2025''' ==
== Fall 2018  ==
 
{| cellpadding="8"
{| cellpadding="8"
!align="left" | date
! align="left" |Date
!align="left" | speaker
! align="left" |Speaker
!align="left" | title
! align="left" |Title
!align="left" | host(s)
! align="left" |Host(s)
|-
|-
| Sept. 7
|Jan 31
|[website TBA] (Institute)
|[https://people.math.wisc.edu/~tgchandler/ Thomas Chandler] (UW)
|''[[Applied/ACMS/absF18#Name (Institute)|title]]''
|[[#Chandler|''Fluid–structure interactions in active complex fluids'']]
| host
|
|-
|-
| Sept. 14
|Feb 7
|[http://www.northeastern.edu/tzhou/ Ting Zhou] (Northeastern)
|[https://www.colorado.edu/aps/adrian-fraser Adrian Fraser] (Colorado)
|''[[Applied/ACMS/absF18#Ting Zhou (Northeastern Univ.)|title]]''
|[[#Fraser|''Destabilization of transverse waves by periodic shear flows'']]
|Li
|Spagnolie
|-
|-
| Sept. 21
|Feb 14
|[https://sites.google.com/a/brown.edu/sanz-alonso/ Daniel Sanz-Alonso] (Chicago)
|TBA
|''[[Applied/ACMS/absF18#Daniel Sanz-Alonso (Chicago Univ.)|title]]''
|
|Chen
|
|-
|-
| Sept. 28
|Feb 21
|[https://perso.univ-rennes1.fr/florian.mehats/ Florian Mehats] (Rennes)
|TBA
|''[[Applied/ACMS/absF18#Mehats (Rennes)|TBA]]''
|
|host
|
|-
| Oct. 5
|[http://www.irisa.fr/ipso/perso/chartier/ Philippe Chartier] (Rennes)
|''[[Applied/ACMS/absF18#Chartier (Rennes)|TBA]]''
|host
|-
|-
| Oct. 12
|Feb 28
|[https://www.math.wisc.edu/~chennan/ Nan Chen] (UW-Madison)
|[https://nmboffi.github.io/ Nick Boffi] (CMU)
|''[[Applied/ACMS/absF18#Chen (UW-Madison)|TBA]]''
|[[#Boffi|TBA]]
|Li
|Li
|-
|-
| Oct. 19
|Mar 7
|[http://www.math.jhu.edu/~feilu/ Fei Lu] (Johns Hopkins)
|Suraj Shankar (Michigan)
|''[[Applied/ACMS/absF18#Lu (JHU)|TBA]]''
|
|Chen
|Spagnolie
|-
|-
| Oct. 26
|Mar 14
|[https://stuart.iit.edu/faculty/matthew-dixon Matthew Dixon] (Illinois Institute of Technoology)
|[https://lu.seas.harvard.edu/ Yue Lu] (Harvard) '''[Colloquium]'''
|''[[Applied/ACMS/absF18#Matthew Dixon (Illinois Institute of Technology)|"Quantum Equilibrium-Disequilibrium”: Asset Price Dynamics, Symmetry Breaking and Defaults as Dissipative Instantons
|[[#Lu|TBA]]
]]''
|Jean-Luc
|-
| Dec. 14
|[http://www.einkemmer.net/ Lukas Einkemmer] (University of Tübingen and University of Innsbruck)
|''[[Applied/ACMS/absF18#Lukas Einkemmer (University of Innsbruck)| TBA
]]''
|Li
|Li
== Spring 2018  ==
 
{| cellpadding="8"
!align="left" | date
!align="left" | speaker
!align="left" | title
!align="left" | host(s)
|-
|-
| Feb. 2, '''4pm, VV 911'''
|Mar 21
|[https://scholar.harvard.edu/tfai Thomas Fai] (Harvard)
|[https://people.llnl.gov/vogman1 Genia Vogman] (LLNL)
|''[[Applied/ACMS/absS18#Thomas Fai (Harvard) | The Lubricated Immersed Boundary Method]]''
|[[#Vogman|TBA]]
| Spagnolie
|-
| Feb. 9
|[https://sites.google.com/site/michaelherty/home Michael Herty] (RWTH-Aachen)
|''[[Applied/ACMS/absS18#Michael Herty (RWTH-Aachen) | Opinion Formation Models and Mean field Games Techniques]]''
|Jin
|-
| Feb. 16
|[https://atmo.tamu.edu/people/faculty/panettalee.html Lee Panetta] (Texas A&M)
|''[[Applied/ACMS/absS18#Lee Panetta (Texas A&M) | Traveling waves and pulsed energy emissions seen in numerical simulations of electromagnetic wave scattering by ice crystals]]''
| Smith
|-
| Feb. 23
|[https://people.ucsc.edu/~fmonard/ François Monard] (UC Santa Cruz)
|''[[Applied/ACMS/absS18#François Monard (UC Santa Cruz) | Inverse problems in integral geometry and Boltzmann transport]]''
|Li
|Li
|-
|-
| ''' Wed, Feb. 28'''
|Mar 28
|[http://www.math.nus.edu.sg/~matyh/ Haizhao Yang] (National University of Singapore)
|''Spring Break''
|''[[Applied/ACMS/absS18#Haizhao Yang (National University of Singapore) | A Unified Framework for Oscillatory Integral Transform: When to use NUFFT or Butterfly Factorization?]]''
|Li
|-
| Mar. 2
|[http://wwwf.imperial.ac.uk/~ekeaveny/ Eric Keaveny] (Imperial College London)
|''[[Applied/ACMS/absS18#Eric Keaveny (Imperial College London) | Linking the micro- and macro-scales in populations of swimming cells]]''
|Spagnolie, Thiffeault
|-
| Mar. 9
|
|
|
|
|
|-
|-
| Mar. 16, '''4pm, VV911'''
|Apr 4
|[https://math.dartmouth.edu/~annegelb/ Anne Gelb] (Dartmouth)
|TBA
|''[[Applied/ACMS/absS18#Anne Gelb (Dartmouth) | Reducing the effects of bad data measurements using variance based weighted joint sparsity ]]''
|Li
|-
| Mar. 23
|
|
|
|
|
|-
|-
| Mar. 30
|Apr 11
|Spring break
|[https://meche.mit.edu/people/faculty/pierrel@mit.edu Pierre Lermusiaux] (MIT)
|  
|[[#Lermusiaux|TBA]]
|  
|Chen
|-
|-
| '''Wed. Apr. 4''', VV 901
|Apr 18
|[http://people.math.gatech.edu/~mtao8/ Molei Tao] (Georgia Tech)
|[https://www.math.uci.edu/~jxin/ Jack Xin] (UC Irvine) '''[Colloquium]'''
|''[[Applied/ACMS/absS18#Molei Tao (Georgia Tech) | Explicit high-order symplectic integration of nonseparable Hamiltonians: algorithms and long time performance]]''
|[[#Xin|TBA]]
|Jin
|
|-
| Apr. 6
|[http://irvinelab.uchicago.edu/ William Irvine] (U Chicago)
|''[[Applied/ACMS/absS18#William Irvine (U Chicago) | Spinning top-ology: Order, disorder and topology in mechanical gyro-materials and fluids]]''
|Spagnolie
|-
| '''Wed. Apr. 11''', VV 901
|[http://www.math.snu.ac.kr/~syha/ Seung-Yeal Ha] (Seoul National University)
|''[[Applied/ACMS/absS18#Seung-Yeal Ha (Seoul National University) |  Synchronization of Kuramoto models and its generalized models]]''
|Jin
|-
| Apr. 13
|[http://www.math.uvic.ca/~khouider/ Boualem Khouider] (UVic)
|''[[Applied/ACMS/absS18#Boualem Khouider (UVic) | Using a stochastic convective parametrization to improve the simulation of tropical modes of variability in a GCM]]''
|Smith, Stechmann
|-
|-
| '''Mon. Apr. 16, VV B115'''
|Apr 25
|[https://www2.ph.ed.ac.uk/~amorozov/ Alexander Morozov] (U Edinburgh)
|[https://www-users.cse.umn.edu/~bcockbur/ Bernardo Cockburn] (Minnesota)
|''[[Applied/ACMS/absS18#Alexander Morozov (U Edinburgh) | Collective behavior of microswimmer suspensions]]''
|[[#Cockburn|''Transforming stabilization into spaces'']]
|Spagnolie
| Stechmann, Fabien
|-
|-
| Apr. 20
|May 2
|[http://www.acsu.buffalo.edu/~davidsal/ David Salac] (SUNY Buffalo)
|[https://sylviaherbert.com/ Sylvia Herbert] (UCSD)
|''[[Applied/ACMS/absS18#David Salac (SUNY Buffalo) | Three-dimensional multicomponent vesicles: methods and influence of material properties]]''
|[[#Herbert|TBA]]
|Spagnolie
|Chen
|-
| Apr. 27
|[http://pages.stat.wisc.edu/~anruzhang/ Anru Zhang] (UW-Madison)
|''[[Applied/ACMS/absS18#Anru Zhang (UW-Madison) | Singular value decomposition for high-dimensional high-order data]]''
|
|  
|}
|}


== Future semesters ==
==Abstracts==
*[[Applied/ACMS/Fall2018|Fall 2018]]
 
*[[Applied/ACMS/Spring2019|Spring 2019]]
<div id="Chandler">
====Thomas G. J. Chandler (UW)====
Title: Fluid-structure interactions in active complex fluids
 
Fluid anisotropy is central to many biological systems, from rod-like bacteria that self-assemble into dense swarms that function as fluids, to the cell cytoskeleton where the active alignment of stiff biofilaments is crucial to cell division. Nematic liquid crystals provide a powerful model for studying these complex environments. However, large immersed bodies elastically frustrate these fluids, leading to intricate interactions. This frustration can be alleviated through body deformations, at the cost of introducing internal stresses. Additionally, active stresses, arising from particle motility or molecular activity, disrupt nematic order by driving flows. In this presentation, I will demonstrate how complex variables enable analytical solutions to a broad range of problems, offering key insights into the roles of body geometry, anchoring conditions, interaction dynamics, activity-induced flows, and body deformations in many biological settings.
 
<div id="Fraser">
====Adrian Fraser (Colorado)====
Title: Destabilization of transverse waves by periodic shear flows
 
Periodic shear flows have the peculiar property that they are unstable to large-scale, transverse perturbations, and that this instability proceeds via a negative-eddy-viscosity mechanism (Dubrulle & Frisch, 1991). In this talk, I will show an example where this property causes transverse waves to become linearly unstable: a sinusoidal shear flow in the presence of a uniform, streamwise magnetic field in the framework of incompressible MHD. This flow is unstable to a KH-like instability for sufficiently weak magnetic fields, and uniform magnetic fields permit transverse waves known as Alfvén waves. Under the right conditions, these Alfvén waves become unstable, presenting a separate branch of instability that persists for arbitrarily strong magnetic fields which otherwise suppress the KH-like instability. After characterizing these waves with the help of a simple asymptotic expansion, I will show that they drive soliton-like waves in nonlinear simulations. With time permitting, I will discuss other fluid systems where similar dynamics are or may be found, including stratified flows and plasma drift waves.
 
<div id="Cockburn">
====Bernardo Cockburn (Minnesota)====
Title: Transforming stabilization into spaces
 
In the framework of finite element methods for ordinary differential equations, we consider the continuous Galerkin method (introduced in 72) and the discontinuous Galerkin method (introduced in 73/74). We uncover the fact that both methods discretize the time derivative in exactly the same form, and discuss a few of its consequences. We end by briefly describing our ongoing work on the extension of this result to some Galerkin methods for partial differential equations.


== Archived semesters ==
== Archived semesters ==
*[[Applied/ACMS/Fall2024|Fall 2024]]
*[[Applied/ACMS/Spring2024|Spring 2024]]
*[[Applied/ACMS/Fall2023|Fall 2023]]
*[[Applied/ACMS/Spring2023|Spring 2023]]
*[[Applied/ACMS/Fall2022|Fall 2022]]
*[[Applied/ACMS/Spring2022|Spring 2022]]
*[[Applied/ACMS/Fall2021|Fall 2021]]
*[[Applied/ACMS/Spring2021|Spring 2021]]
*[[Applied/ACMS/Fall2020|Fall 2020]]
*[[Applied/ACMS/Spring2020|Spring 2020]]
*[[Applied/ACMS/Fall2019|Fall 2019]]
*[[Applied/ACMS/Spring2019|Spring 2019]]
*[[Applied/ACMS/Fall2018|Fall 2018]]
*[[Applied/ACMS/Spring2018|Spring 2018]]
*[[Applied/ACMS/Fall2017|Fall 2017]]
*[[Applied/ACMS/Fall2017|Fall 2017]]
*[[Applied/ACMS/Spring2017|Spring 2017]]
*[[Applied/ACMS/Spring2017|Spring 2017]]

Latest revision as of 19:53, 25 January 2025


Applied and Computational Mathematics Seminar


Spring 2025

Date Speaker Title Host(s)
Jan 31 Thomas Chandler (UW) Fluid–structure interactions in active complex fluids
Feb 7 Adrian Fraser (Colorado) Destabilization of transverse waves by periodic shear flows Spagnolie
Feb 14 TBA
Feb 21 TBA
Feb 28 Nick Boffi (CMU) TBA Li
Mar 7 Suraj Shankar (Michigan) Spagnolie
Mar 14 Yue Lu (Harvard) [Colloquium] TBA Li
Mar 21 Genia Vogman (LLNL) TBA Li
Mar 28 Spring Break
Apr 4 TBA
Apr 11 Pierre Lermusiaux (MIT) TBA Chen
Apr 18 Jack Xin (UC Irvine) [Colloquium] TBA
Apr 25 Bernardo Cockburn (Minnesota) Transforming stabilization into spaces Stechmann, Fabien
May 2 Sylvia Herbert (UCSD) TBA Chen

Abstracts

Thomas G. J. Chandler (UW)

Title: Fluid-structure interactions in active complex fluids

Fluid anisotropy is central to many biological systems, from rod-like bacteria that self-assemble into dense swarms that function as fluids, to the cell cytoskeleton where the active alignment of stiff biofilaments is crucial to cell division. Nematic liquid crystals provide a powerful model for studying these complex environments. However, large immersed bodies elastically frustrate these fluids, leading to intricate interactions. This frustration can be alleviated through body deformations, at the cost of introducing internal stresses. Additionally, active stresses, arising from particle motility or molecular activity, disrupt nematic order by driving flows. In this presentation, I will demonstrate how complex variables enable analytical solutions to a broad range of problems, offering key insights into the roles of body geometry, anchoring conditions, interaction dynamics, activity-induced flows, and body deformations in many biological settings.

Adrian Fraser (Colorado)

Title: Destabilization of transverse waves by periodic shear flows

Periodic shear flows have the peculiar property that they are unstable to large-scale, transverse perturbations, and that this instability proceeds via a negative-eddy-viscosity mechanism (Dubrulle & Frisch, 1991). In this talk, I will show an example where this property causes transverse waves to become linearly unstable: a sinusoidal shear flow in the presence of a uniform, streamwise magnetic field in the framework of incompressible MHD. This flow is unstable to a KH-like instability for sufficiently weak magnetic fields, and uniform magnetic fields permit transverse waves known as Alfvén waves. Under the right conditions, these Alfvén waves become unstable, presenting a separate branch of instability that persists for arbitrarily strong magnetic fields which otherwise suppress the KH-like instability. After characterizing these waves with the help of a simple asymptotic expansion, I will show that they drive soliton-like waves in nonlinear simulations. With time permitting, I will discuss other fluid systems where similar dynamics are or may be found, including stratified flows and plasma drift waves.

Bernardo Cockburn (Minnesota)

Title: Transforming stabilization into spaces

In the framework of finite element methods for ordinary differential equations, we consider the continuous Galerkin method (introduced in 72) and the discontinuous Galerkin method (introduced in 73/74). We uncover the fact that both methods discretize the time derivative in exactly the same form, and discuss a few of its consequences. We end by briefly describing our ongoing work on the extension of this result to some Galerkin methods for partial differential equations.

Archived semesters


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