How can I plot Streamline from a stream function?

Hello,

I have a stream function psi = 1.2X^2 + y^2. I have to plot streamline. How can I plot it by using MATLAB?

Thank you.

Answer 1

[Cris LaPierre]

https://www.mathworks.com/help/matlab/ref/streamline.html

[Alpha Boy]

Thank you for your reply. I have tried it but it is not working for the above function. :(

[Cris LaPierre]

We could probably be of more help if you showed us what you have tried. At a minimum, copy.paste the code as well as any error message it is creating (all the red text).

[Alpha Boy]

[x,y] = meshgrid(-3:.5:3,-3:.5:3); 
u = 2*y;    
v = -2.4*x; 
figure
quiver(x,y,u,v)
startx = -3:0.5:3;
starty = ones(size(startx));
streamline(x,y,u,v,startx,starty)

[Alpha Boy]

[Alpha Boy]

[x,y] = meshgrid(-3:.5:3,-3:.5:3); 
u = x;    
v = -y; 
figure
quiver(x,y,u,v)
startx = -3:0.5:3;
starty = ones(size(startx));
streamline(x,y,u,v,startx,starty)

[Cris LaPierre]

Looks like you got it working. Do you still have a question?

[Alpha Boy]

How can I remove vector field from this plot? Want to plot only streamline.

[Cris LaPierre]

Don't include the code that creates them (quiver)

[Alpha Boy]

[x,y] = meshgrid(-3:.5:3,-3:.5:3); 
u = x;    
v = -y; 
figure
startx = -3:0.5:3;
starty = ones(size(startx));
streamline(x,y,u,v,startx,starty)

[Alpha Boy]

Thank you

Answer 2

[vishal]

U=Kx V=-Ky

[vishal]

Plot streamlines