Ploting Results from CFD (streamline,quiver)

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Marek
Marek 2011-10-23
Hi, I have some results from a CFD program that I am trying to plot. The mesh in the CFD program is a uniform 2d Mesh, it is 1350 units long in the X direction and 260 units high in the Y. The output I get from the program is two notepads, with the U and V velocities at each node. I can import both of them into matlab and have two 351000X1 arrays. The U and V ouputs are along the X meaning the Y co-ordinate does not change for 1350 values. How do i plot these? When i try use the streamline function it says that my X&Y array arent long enough? How do i set up my X and Y arrays?

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Walter Roberson
Walter Roberson 2011-10-23
You cannot pass in a vector for U: you must pass in a 2D or 3D array. You probably need to reshape() your U data.
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Marek
Marek 2011-10-29
Using both of the answers given I was able to plot the data how i wanted. The next step is automating the import of all my files!
Thanks for the hlp!

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更多回答（1 个）

bym
bym 2011-10-23
[xx,yy] = meshgrid(X,Y);
streamline(xx,yy,u,v,startx,starty)
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Marek
Marek 2011-10-23
Yeah i have tried something like that, meshgrid gives me sensible xx yy arrays, but streamline then tell me my U and V arrays are wrong.
??? Error using ==> stream2 at 47
U,V must all be size 2x2 or greater.
Error in ==> streamline at 63
verts =
stream2(x,y,u,v,sx,sy,options);
Error in ==> Untitled2 at 2
streamline(xx,yy,u,v,0,0)
As I said my u and v arrays are both 35100X1,

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