On 12/15/20 2:49 PM, lium...@gmail.com wrote:

1) Solve velocities and pressure analogous to Step-22.
2) Execute coarsening and refinement
3) Interpolate velocities to particles and move particles.

What I found is after grid coarsening, the particles which originally belong to the finer grid loses its host cell and an exception is thrown from ParticleAccessor::get_surrounding_cell().

Qihang,
Interesting. Do you think you could put together a short testcase that illustrates this issue?

Best
 W.

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Wolfgang Bangerth          email:                 bange...@colostate.edu
                           www: http://www.math.colostate.edu/~bangerth/

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