Comparison between a priori and a posteriori slope limiters for high-order finite volume schemes
arxiv(2024)
摘要
High-order finite volume and finite element methods offer impressive accuracy
and cost efficiency when solving hyperbolic conservation laws with smooth
solutions. However, if the solution contains discontinuities, these high-order
methods can introduce unphysical oscillations and severe
overshoots/undershoots. Slope limiters are an effective remedy, combating these
oscillations by preserving monotonicity. Some limiters can even maintain a
strict maximum principle in the numerical solution. They can be classified into
one of two categories: a priori and a posteriori limiters.
The former revises the high-order solution based only on data at the current
time t^n, while the latter involves computing a candidate solution at
t^n+1 and iteratively recomputing it until some conditions are satisfied.
These two limiting paradigms are available for both finite volume and finite
element methods.
In this work, we develop a methodology to compare a priori and
a posteriori limiters for finite volume solvers at arbitrarily high
order. We select the maximum principle preserving scheme presented in
as our a priori limited
scheme. For a posteriori limiting, we adopt the methodology presented
in and search for so-called troubled cells in the
candidate solution. We revise them with a robust MUSCL fallback scheme. The
linear advection equation is solved in both one and two dimensions and we
compare variations of these limited schemes based on their ability to maintain
a maximum principle, solution quality over long time integration and
computational cost.
...
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