Abstract
We present a mixed explicit implicit time stepping scheme for solving the linear advection equationMay, Sandra on a Cartesian embedded boundary mesh. The scheme represents a new approach for overcoming the small cell problem—that standard finite volume schemes are not stable on the arbitrarily small cut cells. It uses implicit time stepping on cut cells for stability. On standard Cartesian cells, explicit time stepping is employed. This keeps the cost small and makes it possible to extend existing schemes from Cartesian meshes to Cartesian embedded boundary meshes. The coupling is done by flux bounding, for which we can prove a TVD result. We present numerical results in one and two dimensions showing second-order convergence in the \(L^1\) norm and between first- and second-order convergence in the \(L^{\infty }\) norm.
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Acknowledgments
The authors would like to thank Ann Almgren, John Bell, and Andy Nonaka from Lawrence Berkeley National Laboratory for providing and helping the authors with the software packages BoxLib and VarDen. This work was supported in part by the DOE office of Advanced Scientific Computing under grant DE-FG02-88ER25053 and by AFOSR grant FA9550-13-1-0052. S. M. was also supported by ERC STG. N 306279, SPARCLE.
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May, S., Berger, M. (2014). A Mixed Explicit Implicit Time Stepping Scheme for Cartesian Embedded Boundary Meshes. In: Fuhrmann, J., Ohlberger, M., Rohde, C. (eds) Finite Volumes for Complex Applications VII-Methods and Theoretical Aspects. Springer Proceedings in Mathematics & Statistics, vol 77. Springer, Cham. https://doi.org/10.1007/978-3-319-05684-5_38
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DOI: https://doi.org/10.1007/978-3-319-05684-5_38
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