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SUMMARY:Time-parallel integration and phase averaging for the rotating sha
 llow water equations on the sphere - Hiroe Yamazaki - Imperial College Lon
 don
DTSTART:20240613T120000Z
DTEND:20240613T130000Z
UID:TALK212902@talks.cam.ac.uk
CONTACT:Jack Atkinson
DESCRIPTION:Historically\, most of the efforts to parallelise the weather 
 and climate models are put into spatial discretisation\, where the atmosph
 ere is divided into a number of overlapping domains with data being shared
  across the overlap. There is a limit to this way of parallelization event
 ually\, when there is not enough computational work to be done on a very s
 mall domain while waiting for the data from the neighboring domain to arri
 ve.\n\nRecently the parallelism in the time discretisation have been ident
 ified as a possible way to increase concurrency in climate models. There a
 re a couple of ways to provide parallelism in the time direction for the n
 umerical solution of ordinary and partial differential equations. In this 
 talk\, we’ll explore a phase averaged model of the rotating shallow-wate
 r equations which computes the solution in parallel within each timestep. 
 This is a different approach to a usual parallel-in-time methods where sol
 utions for multiple time steps are computed in parallel. I will present a 
 phase-averaging framework for the rotating shallow water equations\, a tim
 e integration methodology for it\, proof-of-concept results and error anal
 ysis in order to examine the impact of the phase averaging on the model so
 lutions.\n\nThe zoom link is https://cam-ac-uk.zoom.us/j/89029983641?pwd=Z
 yt5ODZ4eThkcWtsd2pjbjRqK3hYUT09 (Password 309683)
LOCATION:West Hub\, South Room
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