MATLAB: Stream line _issue

stream2stream3streamlinestreamslice

When i plot the streamline using the code. I am unbale to get the stream lines for the complete field as shown in the figure.

Kindly let me know the way to get stream lines all over the plot.

[x,y] = meshgrid(0:0.1:1,0:0.1:1);
u = x;
v = -y;
>> figure
quiver(x,y,u,v)
startx = 0.1:0.1:1;
starty = ones(size(startx));
streamline(x,y,u,v,startx,starty)

Best Answer

In this case, you can try something like this.

[x,y] = meshgrid(0:0.1:1,0:0.1:1);
u = x;
v = -y;
figure
quiver(x,y,u,v)
startx = 0:0.02:1; % <=== chage the number of points in startx
starty = ones(size(startx));
streamline(x,y,u,v,startx,starty)

For the plot in your other question, you can also try to increase the number of points in the startx vector, and accordingly the number of points in starty. I am not sure why I didn't try on that question. Maybe there was some other issue. You can try it again.

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MATLAB: Plot 2D streamline_issue

Try this code

navg = 11;
filenames = cell(navg,1);
for i = 1:navg
    filenames = sprintf('queen2_test_%d.txt', i);
    mydata{i}=importdata(filenames);
    R = mydata{i}(:,1);%X
    C = mydata{i}(:,2);%Y
    U = mydata{i}(:,3);
    V = mydata{i}(:,4);
    F = mydata{i}(:,7)./5;%F(X,Y)
    rg = linspace(0, max(R), 100);
    cg = linspace(0, max(C), 100);
    [Rg, Cg] = meshgrid(rg, cg);
    Fg = griddata(R, C, F, Rg, Cg);
    Ug = griddata(R, C, U, Rg, Cg);
    Vg = griddata(R, C, V, Rg, Cg);
    
    figure
    ax = axes();
    caxis([-5 5])
    colorbar
    ax.YDir = 'reverse';
    hold on;
    contourf(Rg,Cg,Fg);
    colormap(bluewhitered);
    ax.XAxisLocation = 'top';
    grid on;
    hold on
    quiver(R,C,U,V)
    %%%%% streamline plot section start
    xstart = linspace(0, max(R), 50);
    ystart = 0.004*ones(size(xstart));
    s = streamline(Rg,Cg,Ug,Vg,xstart,ystart);
    %%%%% streamline plot section end
    axis([0.02 0.07 .01 0.1])
    set(gca,'XTick',0.02:.02:.07)
    set(gca,'XTickLabel',0.2:0.2:.7)
    set(gca,'YTick',0:.02:.1)
    set(gca,'YTickLabel',0:0.2:1)
    xlabel('x/c')
    ylabel('y/c')
    h = colorbar;
    pos = get(h,'Position');
    h.Label.Rotation = 0;% to rotate the text
    h.Label.Interpreter = 'latex';
    h.Label.String = '$\ C_{p}$';
    set(gca, 'Color', 'black');
    %saveas(gcf,filenames(1:end-4),'png');
    exportgraphics(gcf,[filenames(1:end-4),'.png'], 'Resolution', 600);
    delete(gcf);
end

MATLAB: How to plot Streamline from a stream function

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

Best Answer

Related Solutions

MATLAB: Plot 2D streamline_issue

MATLAB: How to plot Streamline from a stream function

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