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Matlab算例:$ R# O0 v$ c4 C; ]( V' u' i. U1 Q
clear all;
9 x0 b9 G6 S' fclc;
/ Q$ F1 {' e2 m; y6 d i%%
: v; b4 l5 g* ~) a0 te = 2; g = 1;/ |$ D3 v0 f, J% Y
[x,y] = meshgrid(0:20,0:15); % This makes regular grid3 u n& C* }# z0 {+ K7 ?/ \3 E
u = e*x-g*y; % Linear velocity field# M& ?, [ R9 C/ @2 g: c7 T
v = g*x-e*y;
+ o/ }8 u8 j6 Y6 y2 _1 Q; U[phi,psi] = flowfun(u,v); % Here comes the potential and streamfun.# s, _6 W, ~- s& {! F& L- D
%4 T# }. U5 k$ d, W
contour(phi,20,'--r','Displayname','phi') % Contours of potential7 n4 p/ S7 e2 W0 q: s
hold on5 N7 C+ n: b. |* [0 q7 z: U' R
contour(psi,20,'-g','Displayname','psi') % Contours of streamfunction
2 S. V, A$ J- p( ]$ h7 b+ ?% gquiver(x,y,u,v,'Displayname','velocity') % Now superimpose the velocity field3 K t' {5 ?7 b, ?: u3 u: @
legend show;
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