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I am trying to plot the streamlines of a source flow in MATLAB. I just have a couple issues. First, when I change the strength, it doesn't appear that the streamlines change at all. Second, the three lines commented out below, I used them from an example, but now they don't work.

If someone could give me a hand checking this code, that would be great.

Code:

clear all

close all

clc

nx = 100; xmin = -2; xmax = 2;

ny = 100; ymin = -2; ymax = 2;

[x y] = meshgrid(linspace(xmin,xmax,nx),linspace(ymin,ymax,ny));

M = 8; xM = 0; yM = 0;

PsiM = (M/(2*pi))*atan2(y - yM,x - xM);

% levmin = PsiM(1,nx);

% levmax = PsiM(ny,nx/2);

% levels = linspace(levmin,levmax,50);

contour(x,y,PsiM,100)

axis([xmin xmax ymin ymax])

xlabel('x'), ylabel('y')

title('Source of Strength M = 4')

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# Source Potential Flow

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