Carrillo, J. A., Chen, X., Du, B., & Jüngel, A. (2025). Fluid Relaxation Approximation of the Busenberg–Travis Cross-Diffusion System. Communications in Mathematical Physics, 406(7), Article 151. https://doi.org/10.1007/s00220-025-05341-2
The Busenberg-Travis cross-diffusion system for segregating populations is approximated by the compressible Navier-Stokes-Korteweg equations on the torus, including a density-dependent viscosity and drag forces. The Korteweg term can be associated to the quantum Bohm potential. The singular asymptotic limit is proved rigorously using compactness and relative entropy methods. The novelty is the derivation of energy and entropy inequalities, which reduce in the asymptotic limit to the Boltzmann-Shannon and Rao entropy inequalities, thus revealing the double entropy structure of the limiting Busenberg-Travis system.
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Project title:
Multikomponentensysteme mit unvollständiger Diffusion: P 33010-N (FWF - Österr. Wissenschaftsfonds)
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Project (external):
EPSRC FWF IMAG CEX2020-001105-M National Natural Science Foundation of China
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