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Department of Information Technology

Absorbing boundary conditions

The picture displays the wave function in a simulation of a dissociating CO2 molecule. Effective absorbing boundary conditions are imposed at the end of the right channel of the symmetric molecule, whereas the end of the left channel is left untreated, causing unphysical reflections that bounce off the computational boundary and pollute the solution in the interior domain.

We develop efficient absorbing boundary conditions by optimization of a perfectly matched layer. We develop formulas in order to keep the numerical reflections due to the discretization of the problem of the same size as the modeling error due to the finite width of the perfectly matched layer.

The boundary treatment can be combined with the adaptive time-propagation developed in the group.

reflections.png

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Updated  2017-02-04 16:16:07 by Kurt Otto.