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The geometry is created in the following steps:

-Sketch: Sketch the rectangle

-Split edges: Split the horizontal edges to demarcate the unheated and heated sections.

-Dimension edges

-Create "Surface Body": Create a "Surface Body" from the sketch. This is analogous to, say, extruding a sketch to create a 3D body. We always go from a "sketch" to a "body" in DesignModeler. Here the "body" is 2D and referred to idiosyncratically as "Surface Body".

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We want to sketch on the XY plane. To look at the XY plane, click the positive Z-Axis on the compass in the Graphics window.

Look to your the left and you'll see the Tree Outline window. To sketch on the XY plane, highlight XYPlane in the Tree Outline window.To begin sketching, click on the Sketching tab at the bottom of the Tree Outline window. To draw our domain, we will use the Rectangle tool. Click on in the Sketching Toolboxes window. In the blue graphics window, draw the rectangle by first clicking on the origin (make sure the P icon is showing, meaning the cursor is co-incident coincident with a "P"oint, in this case the origin), then . Then select a point in the 1st quadrant.

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Because the wall has two sections, an isothermal section and a heated section, we will need to split the upper edge. To split the edge, select the Modify tab in the Sketching Toolboxes window, and select . Next, click any point along the upper surface of the rectangle. This will split the line into 2 segments.

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It turns out that to get a nice regular mesh, the bottom edge should also be split in the same way. So split the bottom edge as well (don't worry about the location, we'll adjust that next). Image Removed

Now we will make the second segment of each edge to be of the same length (this will automatically ensure that the first segments are also of the same length). Go to the Constraints tab and select "Equal Length."  Click on the top, right partition first. Then click on the bottom right partition. This will make them these segments the same length ensuring that both the top and bottom edges are split at the same location. If you made a mistake,there is an undo button at the top left (caveat: this undo button works only in the sketching mode).

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