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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
|-
|-
|Sept. 12
|Sep 18
|
|Ohm
|''Faculty Meeting''
|Rods in flows: from geometry to fluids
|-
|-
|Sept. 19
|Sep 25
|Yu
|–
|Convection-induced singularity suppression in the Keller-Segel and other nonlinear PDEs
|-
|Sept. 26
|Son
|
|
|-
|-
|Oct. 3
|Oct 2
|
|Arthur Young (Rycroft Group)
|
|Multiphase Taylor–Couette flow transitions
|-
|Oct. 10
|Alex Townsend?  Check
|
|-
|Oct. 17
|
|''Faculty Meeting''
|-
|-
|Oct. 24
|Oct 9
|Prerna
|Albritton
|
|I thought we already knew everything about shear flows?
|-
|-
|Oct. 31
|Oct 16
|
|Chandler
|
|Investigating active liquid crystals using an immersed deformable body
|-
|-
|Nov. 7
|Oct 23
|Bryan
|Ohm
|
|
|-
|-
|Nov. 11
|Oct 30
|
|Thiffeault
|
|<s>Maxey-Riley equation for active particles</s> Time-dependent reciprocal theorem
|-
|-
|Nov. 14
|Nov 6
|–
|
|
|''Faculty Meeting''
|-
|-
|Nov. 21
|Nov 13
|
|Ahmad Zaid Abassi
|Practice talks for DFD
(UC Berkeley)
|Finite-depth standing water waves: theory, computational algorithms, and rational approximations
|-
|-
|Dec. 5
|Nov 20
|
|Jingyi Li
|''Faculty Meeting''
|Arrested development and traveling waves of active suspensions in nematic liquid crystals
|-
|-
|Dec. 12
|Nov 27
|''Thanksgiving''
|
|
|''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 18:32, 4 December 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

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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