How to plot streamline for velocity data??

Question

Turbulence Analysis 2021-2-16

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/746637-how-to-plot-streamline-for-velocity-data

回答： darova 2021-2-16

matlab.mat

Hi,

I need to plot velocity vectors along with streamline. For velocity vectors, I have used quiver() as shown below which works properly, please let me know how to plot streamlines.. I have attached velocity data for your reference.. Please help me with this..

skip=2;
ff=quiver(x',y(1:skip:end),Um(1:skip:end,:),Vm(1:skip:end,:));

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Answer 1

KSSV 2021-2-16

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https://ww2.mathworks.cn/matlabcentral/answers/746637-how-to-plot-streamline-for-velocity-data#answer_624582

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

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Turbulence Analysis 2021-2-16

streamline.bmp

Hi,

Thanks. I have used as follows, but not getting the proper streamline.. I guess, I am not defining startx, starty in a correct way..

skip=2;
ff=quiver(x',y(1:skip:end),Um(1:skip:end,:),Vm(1:skip:end,:));
ff.Color='black';
ff.AutoScaleFactor=12;
set(gca, 'YDir','normal')
startx = -40:40;
starty = 0:80;
streamline(x,y,Um,Vm,startx,starty);

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Answer 2

darova 2021-2-16

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/746637-how-to-plot-streamline-for-velocity-data#answer_624897

在 MATLAB Online 中打开

try this

clc,clear
[x,y,z] = peaks(20);            % some data
[u,v] = gradient(z);            % create direction vectors
t = linspace(0,2*pi,5);
[sx,sy] = pol2cart(t,2);        % start position (circle)
h = streamline(x,y,u,v,sx,sy);  % display streamlines
hold on
for i = 1:length(h)             % loop through all streamlines
    x1 = get(h(i),'xdata');     % get data
    y1 = get(h(i),'ydata');
        % u and v vector fields are known
    u1 = interp2(x,y,u,x1,y1);  % interpolate vector field at streamline position
    v1 = interp2(x,y,v,x1,y1);
    quiver(x1,y1,u1,v1)
end
hold off