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The isosurface of the initial value and isosurfaces u(r, t) = 1.0 after PDE transforms. (a) Initial isosurface defined by Eq. (18); (b) The isosurface after the PDE transform with 2m = 12, t = 104; (c) The isosurface after the PDE transform with 2m = 12, t = 106; (d) Initial isosurface defined by Eq. (17); (e) The isosurface after the PDE transform with 2m = 12, t = 104; (f) The isosurface after the PDE transform with 2m = 12, t = 106
