Abstract
Phenomena in life sciences can be modeled using systems of reaction–diffusion partial differential equations with cross-diffusion. These equations, nonlinear in nature, exhibit complex spatial behavior. Within this framework, we propose an SIR model with cross-diffusion to depict the dynamic interaction between susceptible and infectious individuals in the presence of public policies. Achieving accurate solutions requires fine space discretization, leading to high computational costs. In addition, we propose a second-order semi-implicit method based on an Alternating Direction Implicit (ADI) scheme, called SSIADI, suitable for treating nonlinear reaction and linear diffusion problems.
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