I wonders what this additional amount of codes will be about. According to
my understanding, if we use adaptive meshes every few time steps, we need
to transfer solutions between time steps. But do we need to do anything
about the assemble_system part? What is the tricky part of doing so?

I realized that there is no additional comments about the use of adaptive
meshes afterwards in the example...

Thanks for pointing this out. I've changed that sentence in the introduction and added a long section to the results section of this program. This should show up in the online version of the current documentation tonight.

Basically, you are right that if you use SolutionTransfer the amount of additional code is not very large -- maybe 20 lines. The comment referred to the case discussed in the introduction where you have to integrate functions defined on the previous mesh against the shape functions of the current mesh. This can be done but it is awkward.

Best
 W.

------------------------------------------------------------------------
Wolfgang Bangerth               email:            [email protected]
                                www: http://www.math.tamu.edu/~bangerth/

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