Module: tide.cfl

Numerical stability helper for explicit FDTD time stepping.

Functions

• cfl_condition

cfl_condition

Signature:

cfl_condition(grid_spacing, dt, max_vel, c_max=0.8, eps=1e-15)

Returns: - inner_dt: stable internal time step - step_ratio: integer number of internal steps per user step

Usage notes: - grid_spacing accepts a scalar or list of spacings. - If step_ratio >= 2, a warning is emitted to indicate sub-stepping. - max_vel must be positive.