Posted Mon, 21 Jan 2008 13:31:02 GMT by bausteinkasten

concidering a border between two elements with two different heat transport properties. I put a out flux condition just at line with the border. Does the programm interpolate the boundary condition to both sides? And is trying to get out the same amount of heat on each side of the boundary or does it "know" on which side there are better conditions f.e. if I have air and soil, it does suck more on the soil side because the heat properties of soil are better?

thanks for your help
Posted Tue, 22 Jan 2008 07:59:55 GMT by Boris Lyssenko
To achieve this, you will need a very fine discretization. In the finite element method, the properties of all elements neighboring a node are mapped onto the node for the calculation. Therefore the bc node will have 'mixed' properties. If your discretization is fine enough, however, the next row of nodes on both sides will have pure 'air' or 'soil' conditions, so that the heat flow will be quite different.

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