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Matlab算例:
1 Z+ z/ V& S' j) ^$ L) `; N vclear all;$ ~. t- s, D. X3 h
clc;( S/ [( E3 `5 G4 r7 |- t B' J
%%3 q! Y7 e8 p: n' A
e = 2; g = 1;0 C) i1 h) a+ k- `) q" T: B
[x,y] = meshgrid(0:20,0:15); % This makes regular grid2 F" `5 d6 D' e3 I4 G. ^
u = e*x-g*y; % Linear velocity field
' R5 b6 F" M m+ V! g+ m2 m- Tv = g*x-e*y;" n Q* `8 s! k! b! P/ \
[phi,psi] = flowfun(u,v); % Here comes the potential and streamfun.% z" }$ F/ ?# ^
%
8 j& V9 g: k9 r g1 }+ z: acontour(phi,20,'--r','Displayname','phi') % Contours of potential" O1 m( l$ ]. o1 f, E6 r% }
hold on
9 X5 @" E) }% A+ M: v; }contour(psi,20,'-g','Displayname','psi') % Contours of streamfunction! c/ V2 T+ W; g. Y* }! p0 _: O3 v
quiver(x,y,u,v,'Displayname','velocity') % Now superimpose the velocity field
- j q1 f2 F: K7 c8 E* p& v0 klegend show;
7 X6 _9 U/ F2 ~- }3 u" v: c: |- c
, _, M& c% S$ D
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