Created
January 27, 2015 04:47
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ic[x_, y_] := 1 E^(-350 ((x - 1/5)^2 + ( y - 1/3)^2)) | |
solnDir = | |
NDSolve[ | |
{D[u[x, y, t], {t, 2}] == D[u[x, y, t], {x, 2}] + D[u[x, y, t], {y, 2}], | |
u[x, y, 0] == ic[x, y], | |
(D[u[x, y, t], t] /. t -> 0) == 0, | |
u[0, y, t] == ic[0, y], | |
u[1, y, t] == ic[1, y], | |
u[x, 0, t] == ic[x, 0], | |
u[x, 1, t] == ic[x, 1] | |
}, | |
u, {x, 0, 1}, {y, 0, 1}, {t, 0, 2}, | |
PrecisionGoal -> 2 | |
] | |
solnNeu = | |
NDSolve[ | |
{D[u[x, y, t], {t, 2}] == D[u[x, y, t], {x, 2}] + D[u[x, y, t], {y, 2}], | |
u[x, y, 0] == ic[x, y], | |
(D[u[x, y, t], t] /. t -> 0) == 0, | |
(D[u[x, y, t], x] /. x -> 0) == 0, | |
(D[u[x, y, t], x] /. x -> 1) == 0, | |
(D[u[x, y, t], y] /. y -> 0) == 0, | |
(D[u[x, y, t], y] /. y -> 1) == 0 | |
}, | |
u, {x, 0, 1}, {y, 0, 1}, {t, 0, 2}, | |
PrecisionGoal -> 2 | |
] | |
fDir[x_, y_, t_] := Evaluate[u[x, y, t] /. solnDir[[1, 1]]] | |
fNeu[x_, y_, t_] := Evaluate[u[x, y, t] /. solnNeu[[1, 1]]] | |
Manipulate[ | |
Plot3D[ | |
Switch[BC, Dir, fDir[x, y, t], Neu, fNeu[x, y, t]], | |
{x, 0, 1}, {y, 0, 1}, | |
PlotRange -> {-1, 1}, Axes -> False, | |
ColorFunction -> ColorData["BlueGreenYellow"], | |
FaceGrids -> | |
{ | |
{{-1, 0, 0}, {Range[0, 1, 0.2], Range[-1, 1, 0.5]}}, | |
{{0, 1, 0}, {Range[0, 1, 0.2], Range[-1, 1, 0.5]}}, | |
{{0, 0, -1}, {Range[0, 1, 0.2], Range[0, 1, 0.2]}} | |
}, | |
ViewPoint -> {1.58, -2.72, 1.02} | |
], | |
{{t, 0.5}, 0, 2}, {{BC, Dir, "Boundary Condition"}, {Dir -> "Dirichlet", Neu -> "Neumann"}} | |
] | |
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I do physics but can't quite code.