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- W4387687211 abstract "Recently, a new Lagrange multiplier approach was introduced by Cheng, Liu and Shen in cite{cheng2020new}, which has been broadly used to solve various challenging phase field problems. To design original energy stable schemes, they have to solve a nonlinear algebraic equation to determine the introduced Lagrange multiplier, which can be computationally expensive, especially for large-scale and long-time simulations involving complex nonlinear terms. This paper presents an essential improved technique to modify this issue, which can be seen as a semi-implicit combined Lagrange multiplier approach. In general, the new constructed schemes keep all the advantages of the Lagrange multiplier method and significantly reduce the computation costs. Besides, the new proposed BDF2 scheme dissipates the original energy, as opposed to a modified energy for the classical Lagrange multiplier approach in cite{cheng2020new}. We further construct high-order BDF$k$ schemes based on the new proposed approach. In addition, we establish a general framework for extending our constructed method to dissipative systems. Finally several examples have been presented to demonstrate the effectiveness of the proposed approach." @default.
- W4387687211 created "2023-10-17" @default.
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- W4387687211 date "2023-10-12" @default.
- W4387687211 modified "2023-10-18" @default.
- W4387687211 title "An enhanced and highly efficient semi-implicit combined Lagrange multiplier approach with preserving original energy law for dissipative systems" @default.
- W4387687211 doi "https://doi.org/10.48550/arxiv.2310.08811" @default.
- W4387687211 hasPublicationYear "2023" @default.
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