MATLAB: How to extract the velocity profiles from quiver plot

flowvelocity

I'm trying to post-process my simulation data an to calculate the momentum and displacement thicknesses (Fluent) for flow over a cylinder problem. The velocity vectors in matlab can be seen below:

I want to extract the velocities ona radial lines at each theta position around cylinder. How can I do that?

Thanks in advance,

Acar

Best Answer

This you can achieve by using interpolation. Read about interp2. You have (X,Y) already. Make your required points at which you want velocities and use interp2 for (u,v) components seperately.

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MATLAB: How to add gravitational acceleration acting on a mass that is connected to a cylinder in Simscape

Your force source approach is the right way to model a weight. Two things I would check:

You should also attach a "Mass" block to the R port of the cylinder. You can use (50/9.81) kg for the mass, I guess.
Check the upper and lower limits/initial displacement/directionality of the cylinder block. Chances are your lower displacement limit is 0 and that small negative displacement is due to the large stiffness of the hard stop representing that contact.

- Sebastian

MATLAB: Plotting Velocity p m m m

This is a boundary value problem. You need to have the initial and boundary conditions to develop the velocity field required for this.

Otherwise, you need to have the velocity field itself to calculate the velocity potential and draw streamlines.

Once you have the velocity field, you can draw the streamlines.

doc streamline

and the velocity potential could be drawn as filled contour below the streamlines.

Best Answer

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MATLAB: Plotting Velocity p m m m

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