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DTSTART:20170326T030000
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DTSTART:20161030T020000
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DTSTAMP:20260428T110604Z
UID:57b58984df69c677319958@ist.ac.at
DTSTART:20161214T140000
DTEND:20161214T153000
DESCRIPTION:Speaker: Patrick Blies\nAbstract: In fluid dynamics\, depending
  on the nature of the flow\, different time scales govern the physical pro
 cesses. This is a significant hurdle for numerical simulations of these sy
 stems since the smallest formal time scale determines the size of the over
 all time step of the numerical simulation. This can slow down computations
  considerably. To overcome the obstacle of small formal time scales\, and 
 speed up the integration of the governing equations\, different methods ha
 ve been implemented into the ANTARES code – the code used by our group to
  simulate\, amongst other things\, convection in pulsating and non-pulsati
 ng stars and double-diffusive convection. The first part of my talk will f
 ocus on the advancement of the applicability of one of these methods: a st
 rong stability preserving implicit-explicit (IMEX) Runge-Kutta scheme for 
 efficient time-integration of stiff equations.\nThe partial differential e
 quation which results from the implicit part of the IMEX scheme has non-co
 nstant coefficients which are either dependent on space only – in which c
 ase the equation to be solved is linear – or are dependent on space and t
 emperature\, e.g. – in which case the equation is nonlinear. To solve thi
 s arising (non-) linear equations of Helmholtz type\, I have derived and i
 mplemented a multigrid method for both the linear and nonlinear\, variable
  coefficients Helmholtz equation in three dimensions. This will constitute
  the second part of my presentation.
LOCATION:Meeting room 2nd floor / Office Bldg West (I21.01.132)\, ISTA
ORGANIZER:sdanzing@ist.ac.at
SUMMARY:Patrick Blies: A 3D Helmholtz solver and efficient time integration
  methods for viscous flows in the
URL:https://talks-calendar.ista.ac.at/events/235
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