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= Physical Applied Math Group Meeting =
= Physical Applied Math Group Meeting =


*'''When:''' Thursdays at 4:00pm (unless there is a departmental meeting)
*'''When:''' Wednesdays at 4:00pm in VV 901
*'''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://people.math.wisc.edu/~chr/ Chris Rycroft], [http://www.math.wisc.edu/~spagnolie Saverio Spagnolie] and [http://www.math.wisc.edu/~jeanluc Jean-Luc Thiffeault]
*'''To join the Physical Applied Math mailing list:''' See the [https://admin.lists.wisc.edu/index.php?p=11&l=phys_appl_math mailing list website].
*'''Announcements:''' Contact the organizers to join this meeting


== Fall 2019 ==
== Fall 2024 ==
    
    
{| cellpadding="8"
{| cellpadding="8"
!align="left" | date
!align="left" | Date
!align="left" | speaker
!align="left" | Speaker
!align="left" | title
!align="left" | Title
|-
|-
|Sept. 5
|Sep 11
|
|Spagnolie
|Organizational meeting
|Growth and buckling of filaments in viscous fluids, Part I
|-
|Sep 18
|Ohm
|Rods in flows: from geometry to fluids
|-
|-
|Sept. 12
|Sep 25
|–
|
|
|''Faculty Meeting''
|-
|Sept. 19
|Yu
|Convection-induced singularity suppression in the Keller-Segel and other nonlinear PDEs
|-
|Sept. 26
|Son
|State-constraint static Hamilton-Jacobi equations in nested domains
|-
|Oct. 3
|Hongfei
|Microswimmers interacting with walls
|-
|-
|Oct. 10
|Oct 2
|Alex Townsend
|Arthur Young (Rycroft Group)
|The ultraspherical spectral method
|Multiphase Taylor–Couette flow transitions
|-
|-
|Oct. 17
|Oct 9
|
|Albritton
|''Faculty Meeting''
|I thought we already knew everything about shear flows?
|-
|-
|Oct. 24
|Oct 16
|Prerna
|Chandler
||Pak, Feng and Stone, [https://www.cambridge.org/core/journals/journal-of-fluid-mechanics/article/viscous-marangoni-migration-of-a-drop-in-a-poiseuille-flow-at-low-surface-peclet-numbers/2504CA0D4BC84B06E2E33DA39DE93355 Viscous Marangoni migration of a drop in a Poiseuille flow at low surface Péclet numbers].
|Investigating active liquid crystals using an immersed deformable body
|-
|-
|Oct. 31
|Oct 23
|
|Ohm
|
|
|-
|-
|Nov. 7
|Oct 30
|Bryan
|Thiffeault
|
|<s>Maxey-Riley equation for active particles</s> Time-dependent reciprocal theorem
|-
|-
|Nov. 11
|Nov 6
|
|–
|
|
|-
|-
|Nov. 14
|Nov 13
|
|Ahmad Zaid Abassi
|''Faculty Meeting''
(UC Berkeley)
|Finite-depth standing water waves: theory, computational algorithms, and rational approximations
|-
|-
|Nov. 21
|Nov 20
|
|Jingyi Li
|Practice talks for DFD
|Arrested development and traveling waves of active suspensions in nematic liquid crystals
|-
|-
|Dec. 5
|Nov 27
|''Thanksgiving''
|
|
|''Faculty Meeting''
|-
|-
|Dec. 12
|Dec 4
|Thiffeault
|
|
|''Faculty Meeting''
|-
|-
|}
|}


== Spring 2019 ==
== Abstracts ==
 
 
{| cellpadding="8"
=== '''Ahmad Abassi, University of California, Berkeley''' ===
!align="left" | date
Title: Finite-depth standing water waves: theory, computational algorithms, and rational approximations
!align="left" | speaker
!align="left" | title
|-
|Jan. 24
|
|''Faculty Meeting''
|-
|Jan. 31
|Jean-Luc
|Organizational meeting; J-LT speaks on Vortices in a channel
|-
|Feb. 7
|
|''Faculty Meeting''
|-
|Feb. 14
|Yu
|Suppression of phase separation by mixing
|-
|Feb. 21
|
|''Faculty Meeting''
|-
|Feb. 28
|Bryan
|Riffles shuffles and mixing
|-
|Mar. 7
|
|''Faculty Meeting''
|-
|Mar. 14
|Hongfei
|[https://www.springer.com/us/book/9781441916044 Diffusion across potential barriers]
|-
|Mar. 21
|
|''Spring Break''
|-
|Mar. 28
|
|''Faculty Meeting''
|-
|Apr. 4
|Ruojun
|Internal diffusion-limited aggregation and rotor-router walks with drift
|-
|Apr. 11
|Jiajia
|[https://doi.org/10.1063/1.1675038 Freed, Wiener Integrals and Models of Stiff Polymer Chains]
|-
|Apr. 18
|Wangping
|Entanglement of frictionless strings
|-
|Apr. 25
|John
|pseudo-Anosov homeomorphisms with large entropy
|-
|May 2
|
|''Faculty Meeting''
|-
|May 9
|Saverio
|Internal capillary origami (see [https://journals.aps.org/pra/abstract/10.1103/PhysRevA.44.1182 Seifert et al, Shape transformations of vesicles] and [https://www.annualreviews.org/doi/full/10.1146/annurev-fluid-122316-050130?casa_token=lYj2Hmpn0fEAAAAA:269tjv-n7Odyzgam7PniTi5WmNPjP0qVrO7qxV0a8Ox_Tl4fNsawlxTves-ev7vI_h9Sx_0jKfwK Bico et al., Elastocapillarity (Review article)])
|-
|}


== Fall 2018 ==
We generalize the semi-analytic standing-wave framework of Schwartz and Whitney (1981) and Amick and Toland (1987) to finite-depth standing gravity waves. We propose an appropriate Stokes-expansion ansatz and iterative algorithm to solve the system of differential equations governing the expansion coefficients. We then present a more efficient algorithm that allows us to compute the asymptotic solution to higher orders. Finally, we conclude with numerical simulations of the algorithms implemented in multiple-precision arithmetic on a supercomputer to study the effects of small divisors and the analytic properties of rational approximations of the computed solutions. This is joint work with Jon Wilkening (UC Berkeley).
 
{| cellpadding="8"
!align="left" | date
!align="left" | speaker
!align="left" | title
|-
|Jan. 31
|Jean-Luc
|Organizational meeting; J-LT speaks on Aldous and Diaconis, [https://www.ams.org/journals/bull/1999-36-04/S0273-0979-99-00796-X/ Longest increasing subsequences: from patience sorting to the Baik-Deift-Johansson theorem]
|-
|Sep. 13
|Son
|[https://arxiv.org/abs/1808.06129 Rate of convergence for periodic homogenization of convex Hamilton-Jacobi equations in one dimension]
|-
|Sep. 20
|
|''Faculty Meeting''
|-
|Sep. 27
|[https://www.math.cmu.edu/~gautam/sj/index.html Gautam Iyer] (CMU)
|[https://arxiv.org/abs/1806.03699 Dissipation enhancement by mixing]
|-
|Oct. 4
|Gage
|[https://www.dropbox.com/s/tjc4v03cwgzeppm/Group_talk_ab___notes.pdf Escape rates of random walks on free groups]
|-
|Oct. 11
|<i>cancelled</i>
|
|-
|Oct. 18
|Yu Feng
|Relaxation enhancement for Advective Cahn-Hilliard (practice for specialty)
|-
|Oct. 25
|Yu's specialty <b>2-3pm, B139</b>
|Relaxation enhancement for Advective Cahn-Hilliard
|-
|Nov. 1
|Wil
|Powers, [https://journals.aps.org/rmp/abstract/10.1103/RevModPhys.82.1607; Dynamics of filaments and membranes in a viscous fluid]; Guven et al. [http://iopscience.iop.org/article/10.1088/1751-8113/47/35/355201/pdf Environmental bias and elastic curves on surfaces]
|-
|Nov. 8
|Tom
|[https://arxiv.org/abs/1809.01190 Mixing by jellyfish]
|-
|Nov. 15
|
|''Faculty Meeting''
|-
|Nov. 22
|
|''Thanksgiving Break''
|-
|Nov. 29
|Chris
|Sun et al., [https://www.sciencedirect.com/science/article/pii/S0167278911001588 A mathematical model for the synchronization of cows]
|-
|Dec. 6
|
|''Faculty Meeting''
|-
|'''Dec. 12, B239'''
|Jean-Luc
|Cooking food by flipping
|-
|Dec. 13
|
|''Faculty Meeting''
|}


== Archived semesters ==
== Archived semesters ==
*[[Applied/Physical Applied Math/Spring2024|Spring 2024]]
*[[Applied/Physical_Applied_Math/Fall2023|Fall 2023]]
*[[Applied/Physical_Applied_Math/Fall2021|Fall 2021]]
*[[Applied/Physical_Applied_Math/Spring2021|Spring 2021]]
*[[Applied/Physical_Applied_Math/Fall2020|Fall 2020]]
*[[Applied/Physical_Applied_Math/Summer2020|Summer 2020]]
*[[Applied/Physical_Applied_Math/Spring2020|Spring 2020]]
*[[Applied/Physical_Applied_Math/Fall2019|Fall 2019]]
*[[Applied/Physical_Applied_Math/Spring2019|Spring 2019]]
*[[Applied/Physical_Applied_Math/Fall2018|Fall 2018]]
*[[Applied/Physical_Applied_Math/Spring2018|Spring 2018]]
*[[Applied/Physical_Applied_Math/Spring2018|Spring 2018]]
*[[Applied/Physical_Applied_Math/Fall2017|Fall 2017]]
*[[Applied/Physical_Applied_Math/Fall2017|Fall 2017]]

Latest revision as of 17:50, 14 November 2024

Physical Applied Math Group Meeting

Fall 2024

Date Speaker Title
Sep 11 Spagnolie Growth and buckling of filaments in viscous fluids, Part I
Sep 18 Ohm Rods in flows: from geometry to fluids
Sep 25 –
Oct 2 Arthur Young (Rycroft Group) Multiphase Taylor–Couette flow transitions
Oct 9 Albritton I thought we already knew everything about shear flows?
Oct 16 Chandler Investigating active liquid crystals using an immersed deformable body
Oct 23 Ohm
Oct 30 Thiffeault Maxey-Riley equation for active particles Time-dependent reciprocal theorem
Nov 6 –
Nov 13 Ahmad Zaid Abassi

(UC Berkeley)

Finite-depth standing water waves: theory, computational algorithms, and rational approximations
Nov 20 Jingyi Li Arrested development and traveling waves of active suspensions in nematic liquid crystals
Nov 27 Thanksgiving
Dec 4 Thiffeault

Abstracts

Ahmad Abassi, University of California, Berkeley

Title: Finite-depth standing water waves: theory, computational algorithms, and rational approximations

We generalize the semi-analytic standing-wave framework of Schwartz and Whitney (1981) and Amick and Toland (1987) to finite-depth standing gravity waves. We propose an appropriate Stokes-expansion ansatz and iterative algorithm to solve the system of differential equations governing the expansion coefficients. We then present a more efficient algorithm that allows us to compute the asymptotic solution to higher orders. Finally, we conclude with numerical simulations of the algorithms implemented in multiple-precision arithmetic on a supercomputer to study the effects of small divisors and the analytic properties of rational approximations of the computed solutions. This is joint work with Jon Wilkening (UC Berkeley).

Archived semesters


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