Swift–Hohenberg equation
Swift–Hohenberg equation:
with periodic boundary conditions, and we need
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Load the interactive simulation.
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Depending on the signs of
, , and , this system can support a wide range of patterns and dynamical behaviour. One important class of behaviour is subcriticality, where the dynamics of the system can become quite complicated and include things like multistability of homogeneous and patterned states, and localised solutions as described below.
Localised solutions
When
Specific initial conditions can induce localised patterns, which fall off to the background of
- Load this localised simulation as one example.
- Change the initial conditions or click to induce localised structures throughout the domain: see that these structures only materialise if they are sufficiently far from the homogeneous state (as otherwise perturbations will decay back to it).
This example is based on a 2023 paper by Dan Hill and collaborators which studies symmetric localised solutions of the Swift-Hohenberg equation.
- The default initial condition picks out a solution with
symmetry. - If you change the parameter
to the value and then press , this will replace the initial condition with one that evolves to a hexagonal solution ( symmetry). - If you set
and press , this will replace the initial condition with one that evolves to a -symmetric solution.