The CFL condition, or Courant-Friedrichs-Lewy condition, is a mathematical criterion that ensures stability in the numerical solution of hyperbolic partial differential equations (PDEs) using finite difference methods. This condition relates the time step size to the spatial grid size and the speed of wave propagation, preventing numerical solutions from becoming unstable and inaccurate over time. Adhering to the CFL condition helps maintain the physical fidelity of the modeled phenomena.
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