BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:State Redistribution For Embedded Boundary Methods - Dr Ann Almgre
 n\, Lawrence Berkeley National Laboratory
DTSTART:20230306T110000Z
DTEND:20230306T120000Z
UID:TALK197836@talks.cam.ac.uk
CONTACT:Samantha Selvini
DESCRIPTION:Embedded boundary / cut cell methods are one approach to solvi
 ng the equations for fluid flow in the presence of complex geometries.  In
  the cut cell approach\, the boundary of the domain is treated as an inter
 face in a (locally) uniform background mesh\, resulting in grid cells that
  are of uniform size and shape away from the interface\, but irregular and
  potentially very small immediately adjacent to the surface.  The "small c
 ell problem" refers to the algorithmic challenge that results from standar
 d discretization approaches on very small cut cells. \nState redistributio
 n (SRD) is one approach to addressing the small cell problem.  Like the cl
 assic flux redistribution approach\, state redistribution modifies the adv
 ective update in and near small cut cells to enforce numerical stability. 
   In the original formulation by Berger and Guiliani (2020)\, state redist
 ribution was applied to compressible flow in two dimensions.  In more rece
 nt work\, we have extended the SRD algorithm to three dimensions\, general
 ized it using a less dissipative weighting scheme\, and applied it to low 
 Mach number flows. An open-source performance-portable software implementa
 tion of SRD in two and three dimensions is now available. \nIn this talk w
 e present the weighted state redistribution algorithm and contrast results
  with the flux redistribution scheme.  We illustrate the use of the method
  in compressible combustion and incompressible flow applications and discu
 ss possible further extensions of the algorithm.\n\n_About the speaker_\n\
 nDr Ann Almgren is a Senior Scientist and the Department Head of the Appli
 ed Mathematics Department in the Applied Mathematics and Computational Res
 earch Division at Lawrence Berkeley National Laboratory. Her primary resea
 rch interest is in computational algorithms for solving PDEs in a variety 
 of application areas. Her current projects include the development and imp
 lementation of new multiphysics algorithms in high-resolution adaptive mes
 h codes that are designed for the latest hybrid architectures.\nShe is a S
 IAM Fellow\, the Deputy Director of the ECP AMReX Co-Design Center\, and s
 erves on the editorial boards of CAMCoS and IJHPCA. Prior to coming to LBL
  she worked at the Institute for Advanced Study in Princeton\, NJ\, and at
  Lawrence Livermore National Lab.\n\n"Register here for the FREE talk.":ht
 tps://docs.google.com/forms/d/e/1FAIpQLSc4tMc1YU5A-DWLYiUaqftIRLbaFsLJ0VuW
 c2F-KlvS3il7OA/viewform?usp=sf_link\n\nMonday 6 March\n11:00 - 12:00\nHybr
 id event\n\nJJ Thomson seminar room\nMaxwell Centre\nJ Tomson ave\, Cambri
 dge\nCB3 0HE\n\nOr join us on Zoom:\n\n"Zoom link":https://us06web.zoom.us
 /j/83557475574?pwd=MlVFY1lWNTRRTTNmTEpGeFBDVWw5UT09\n\nMeeting ID: 835 574
 7 5574\nPasscode: 716462\nFind your local number: https://us06web.zoom.us/
 u/kdmQtIKdbI
LOCATION:Hybrid - Maxwell Centre &amp\; on Zoom
END:VEVENT
END:VCALENDAR