Ploting Results from CFD (streamline,quiver)

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?

Answer 1

[Walter Roberson]

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.

[Marek]

So your saying that i need to get my U and V data into something that is 1350X260? Is there anyway matlab can change that about? I know i could certainly swap it all about in excel then put it back into matlab but i dont fancy changning it all by hand.

[Walter Roberson]

U = reshape(YourUData,1350,260);

[Marek]

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!

Answer 2

[bym]

[xx,yy] = meshgrid(X,Y);
streamline(xx,yy,u,v,startx,starty)

[Marek]

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,