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SUMMARY:Adjoint-based data assimilation for compressible and reactive flow
 s - Professor Joern Sesterhenn\, Technische Universitat Berlin
DTSTART:20190117T113000Z
DTEND:20190117T123000Z
UID:TALK117163@talks.cam.ac.uk
CONTACT:Catherine Pearson
DESCRIPTION:The analysis of complex fluid mechanical phenomena is usually 
 based on\nexperimental or theroretical/numerical analysis. Both approaches
  provide\nvaluable\, but incomplete information. Experimental data is usua
 lly\nincomplete\, in the sense that not every state variable is accessible
  by\nmeasurements in every point of the domain. On the other hand\, numeri
 cal\nsolutions often lack the proper initial and boundary\nconditions. The
 rfore computations do not match the real flow conditions\,\neven if the mo
 dell is perfectly valid. To obtain a complete set of\ninformation of a rea
 l flow state\, both approaches can be combined by\nmeans of data assimilat
 ion.\n\nTo this end we use a variational approach. That means the paramete
 rs\,\ninitial and boundary conditions of a numerical model are adapted unt
 il\nthe numerical solution matches the experimental data with respect to a
 \nspecific optimality condition. The required adaptation of a preliminary\
 nmodel (i.e. the gradient towards a better solution) is determined by aid\
 nof the adjoint equations. The assimilated numerical state contains the\nu
 nknown/unmeasured quantities under the constraint of the applied\nmodel. F
 urthermore\, the quality of experimental data is enhanced by the\nmodel ac
 ting as a filter\, which can reduce measurement noise.\n\nThe application 
 of an adjoint-based data assimilation for compressible\nflows will be pres
 ented with three different applications. The first\napplication identifies
  sound sources. The second application deals with\nthe determination of in
 stantaneous pressure distributions based on PIV\ndata. The third is the an
 alysis of reactive flow configurations.\n\nThe numerical framework and its
  requirements on the computational\ninfrastructure will be discussed in de
 tail.\n
LOCATION:Open Plan Area\, BP Institute\, Madingley Rise CB3 0EZ
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