How can I add an edge to my model?

Question

Maximilian Schönau 2021-3-2

0
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https://ww2.mathworks.cn/matlabcentral/answers/760406-how-can-i-add-an-edge-to-my-model

回答： Hafsa Nouhi 2022-3-28

I started using the Partial Differential Equation Toolbox and after generating a basic geometry, I wanted to add edges to it. Hower, there is only a function for adding a vertex and one for adding faces. Why do those two functions exist, but not one to add an edge?

Below my geometry, I want to have an edge at the bottom and the top between the two rectangles.

model = createpde("thermal","transient-axisymmetric");
Length = 1;
outerThickness = 0.1;
innerThickness = 0.4;
Thickness = outerThickness + innerThickness;
leftEdges = [-innerThickness/2 -innerThickness/2 -Thickness/2 -Thickness/2; ...
    0 Length Length 0];
rightEdges = [innerThickness/2 innerThickness/2 Thickness/2 Thickness/2;...
    0 Length Length 0];
shape = polyshape({rightEdges(1,:), leftEdges(1,:),}, ...
    {rightEdges(2,:), rightEdges(2,:)});
% Convert shape to geometry
tr = triangulation(shape);
tnodes = tr.Points';
telements = tr.ConnectivityList';
geometryFromMesh(model,tnodes,telements);