Dear Dealii users I am trying to solve a simple 3-D transport equation
u_t+ div(a u) =f by adaptive DG spatial discretizations. Following the strategy in Tutorial 28 to evaluate the right hand side integral associated with the solution at the previous time, I have to include an object to store the "previous" dof constructed by an "previous" triangulation. My question is how can I define this "previous" triangulation not by invoking the copying function which, as the manual says is not cheap. Best, Liang
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