Journal
JOURNAL OF MATHEMATICAL BIOLOGY
Volume 41, Issue 5, Pages 455-475Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s002850000038
Keywords
chemotaxis; bacterial growth; pattern formation; numerical; fractional step; CLAWPACK
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A fractional step numerical method is developed for the nonlinear partial differential equations arising in chemotaxis models, which include density-dependent diffusion terms for chemotaxis, as well as reaction and Fickian diffusion terms. We take the novel approach of viewing the chemotaxis term as an advection term which is possible in the context of fractional steps. This method is applied to pattern formation problems in bacterial growth and shown to give good results, High-resolution methods capable of capturing steep gradients (from CLAWPACK) are used for the advection step, while the A-stable and L-stable TR-BDF2 method is used fur the diffusion step. A numerical instability that is seen with other diffusion methods is analyzed and eliminated.
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