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CATEGORIES:Institute for Energy and Environmental Flows (IEEF
)
SUMMARY:Adjoint-based data assimilation for compressible a
nd reactive flows - Professor Joern Sesterhenn\, T
echnische Universitat Berlin
DTSTART;TZID=Europe/London:20190117T113000
DTEND;TZID=Europe/London:20190117T123000
UID:TALK117163AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/117163
DESCRIPTION:The analysis of complex fluid mechanical phenomena
is usually based on\nexperimental or theroretical
/numerical analysis. Both approaches provide\nvalu
able\, but incomplete information. Experimental da
ta is usually\nincomplete\, in the sense that not
every state variable is accessible by\nmeasurement
s in every point of the domain. On the other hand\
, numerical\nsolutions often lack the proper initi
al and boundary\nconditions. Therfore computations
do not match the real flow conditions\,\neven if
the modell is perfectly valid. To obtain a complet
e set of\ninformation of a real flow state\, both
approaches can be combined by\nmeans of data assim
ilation.\n\nTo this end we use a variational appro
ach. That means the parameters\,\ninitial and boun
dary conditions of a numerical model are adapted u
ntil\nthe numerical solution matches the experimen
tal data with respect to a\nspecific optimality co
ndition. The required adaptation of a preliminary\
nmodel (i.e. the gradient towards a better solutio
n) is determined by aid\nof the adjoint equations.
The assimilated numerical state contains the\nunk
nown/unmeasured quantities under the constraint of
the applied\nmodel. Furthermore\, the quality of
experimental data is enhanced by the\nmodel acting
as a filter\, which can reduce measurement noise.
\n\nThe application of an adjoint-based data assim
ilation for compressible\nflows will be presented
with three different applications. The first\nappl
ication identifies sound sources. The second appli
cation deals with\nthe determination of instantane
ous pressure distributions based on PIV\ndata. The
third is the analysis of reactive flow configurat
ions.\n\nThe numerical framework and its requireme
nts on the computational\ninfrastructure will be d
iscussed in detail.\n
LOCATION:Open Plan Area\, BP Institute\, Madingley Rise CB3
0EZ
CONTACT:Catherine Pearson
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