Abstract
In this paper, we are concerned with the asymptotic behavior of L∞ weak-entropy solutions to the compressible Euler equations with a vacuum and time-dependent damping \( - \frac{m}{{{{(1 + t)}^\lambda }}}\). As \(\lambda \in (0,\tfrac{1}{7}]\), we prove that the L∞ weak-entropy solution converges to the nonlinear diffusion wave of the generalized porous media equation (GPME) in \({L^2}(\mathbb{R})\). As \(\lambda \in (\tfrac{1}{7},1)\), we prove that the L∞ weak-entropy solution converges to an expansion around the nonlinear diffusion wave in \({L^2}(\mathbb{R})\), which is the best asymptotic profile. The proof is based on intensive entropy analysis and an energy method.
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Dedicated to Professor Banghe LI on the Occasion of his 80th birthday
S. Geng’s research was supported in part by the National Natural Science Foundation of China (12071397) and Excellent Youth Project of Hunan Education Department (21B0165). F. Huang’s research was supported in part by the National Key R&D Program of China 2021YFA1000800 and the National Natural Science Foundation of China (12288201).
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Geng, S., Huang, F. & Wu, X. L2-convergence to nonlinear diffusion waves for Euler equations with time-dependent damping. Acta Math Sci 42, 2505–2522 (2022). https://doi.org/10.1007/s10473-022-0618-6
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DOI: https://doi.org/10.1007/s10473-022-0618-6
Key words
- L 2-convergence
- compressible Euler Equations
- time asymptotic expansion
- time-dependent damping
- relative entropy inequality