Turing on Turing
Functions of space can allow us to change how a PDE solution varies in space and time. Here is an example using such a function, given by $I_T(x,y)$, where this function represents a picture. The equations are based on the Schnakenberg model.

Load the interactive Turing simulation.

You can upload your own image by clicking on and then clicking on the image of → Images Alan Turing’s face next to $I_T(x,y)$. The image will be effectively treated as a greyscale function $I_T(x,y)$, which will be approximately 1 when the image is close to white and approximately 0 when the image is close to black.

Change $I_T$ to $I_S$ in to see another famous mathematical face. → Definitions Sofya Kovalevskaya also has her own interactive Sofya simulation.
Other images
You can upload a replacement for either of these images under They can each be used as heterogeneities in many parts of VisualPDE. Some examples include: → Images.