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METHOD:PUBLISH
BEGIN:VEVENT
DTSTAMP:20220612T185201Z
DTSTART:20220620T130000Z
DTEND:20220620T140000Z
SUMMARY:David Schaeffer - Physical Applied Mathematics Seminar
UID:{http://www.columbasystems.com/customers/uom/gpp/eventid/}z1re-l4bnw9
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DESCRIPTION:David Schaeffer (Duke University) joins us for this in-person
seminar in the Physical Applied Mathematics Series\n\nAbstract: In this
talk I will relate the history of my involvement with granular flow. Th
e story is rooted in mathematics\, and to explain it I need to introduce
a number of key topics in this field\, including some problems for curr
ent research.\n\nOn the personal side: I learned of this exciting\, then
largely unexplored\, field in the mid-eighties and quickly made this th
e focus of my research. Fairly early on I discovered that the simplest
dynamic equations for such flow were ill-posed and therefore untenable.
I spent many frustrating years trying to define ever more restrictive c
onditions under which the equations would be well-posed. Ultimately I ga
ve up and left the field in disgust even as the field was becoming fashi
onable. I closed out my career trying to retrain myself\, with at best m
odest success\, as a mathematical biologist\, and I expected when I reti
red in 2012 that my involvement with mathematics was over. However\, du
ring a visit to Manchester in 2014\, Nico Gray introduced me to some sti
mulating new ideas in granular flow\, especially ?(I)-rheology\, that ha
d appeared while I was ignoring the literature. In collaboration with h
im and members of his group\, we found that my previous analysis of ill-
posedness could be invoked to enhance the understanding of ?(I)-rheology
\, and we went on to modify this theory to obtain well-posed equations?—
my unachieved goal from years earlier. Continuing this work\, I am hap
pily spending my dotage exploring further ramifications of these ideas w
ith younger collaborators.
STATUS:TENTATIVE
TRANSP:TRANSPARENT
CLASS:PUBLIC
LOCATION:Frank Adams 1\, Alan Turing Building
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