# User:Brian P. Josey/Notebook/2010/03/10

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## FEMM Again

Working on FEMM again today. I hope to get through the heat flow tutorial, and to export some data from the basic magnetostatics tutorial in a way that I can access in either MATLAB or LabVIEW.

### Chimney Design

I am going through the tutorials again today. The one that I did today is the tutorial for the heat flow portion of the program. The tutorials are starting to get pretty easy, and this one only took twenty minutes at most. The problem is to create a square chimney, with one meter thick brick walls, and determine the temperature between the inside and the outside. Here is a picture of the cross section of the chimney.

In this picture, the lower left corner is the inside of the chimney, and the outside of the chimney is to the right and top of the image. The chimney is made out of common bricks, and the inside temperature is 800 K and outside it is 300 K. They colors indicate the temperature of the material along the bricks, and the key is included on the right.

### Magnetostatics Data

I am revisiting the tutorial I did on Monday. In the problem, I created a coil of copper wire, and ran 1A current through it. This created a simple magnet, and I am using it as the basis for learning the program.

This is a diagram of the magnetic field intensity caused by the current running through the copper coil. As always, blues represent lower field intensities, while reds and purples represent higher field intensities.

On the inner block, I am trying to extract the values for the magnetic field intensities from the left side. This is along the red line that might be a little difficult to see because of the purple. This gives a graph of the field intensity verses the position:

In this graph, the y-axis represents the magnitude of the magnetic field running along the length, which is represented along the x-axis. Magnetic field is represented in Tesla, and the length in inches, where the zero represents the upper point on the contour in the above picture.

It is really easy to get the graph into a text file. After you pick the curve that you want the graph to be on, and hit the plot button, you are given a dialog box, in it just check the "Write data to text" button, and you can save the data as a text file to access in either MATLAB or LabVIEW.