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Geometry

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Overview

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".

Specify Geometry as 2D

First, we need to specify that the geometry is 2-dimensional. Right click the Geometry box and select Properties. This will open the Properties of Schematic A2: Geometry Window. Under Advance Geometry Options change Analysis Type from 3D to 2D.

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After the analysis type has been set, we are you can dismiss the Properties window. We are now ready to launch Design ModelerDesignModeler, the design drawing tool in ANSYS. Open Design Modeler DesignModeler by double-clicking the geometry box . After launching the Design Modeler, you Twiddle your thumbs until the DesignModeler window comes up. You will be prompted to choose a standard unit of measurement. Select Meter as the standard unit, and click OK.

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The convection pipe flow can be simplified to a 2D axis symmetric problem and solved in FLUENT. The following list shows the key features in creating the simplified model for the 2D steady convection problem:

-Sketch

-Rectangle

-Split Edge

-Equal Length

-Dimensions

-Create Surface

Sketching

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 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 in 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 you are in fact selecting the pointthe cursor is co-incident with a "P"oint, in this case the origin), then select a point in the 1st quadrant.

Because there are e
Because the wall has two sections to our domain, , an isothermal section and a heated section and an isothermal section, we will need to split the upper surface of our domainedge. To split the lineedge, 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.

Do this as well for the bottom line.

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 Added

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 Image RemovedNext, go to 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 right partitions of the rectangle to make the splits equidistantedges 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).

Dimensioning

The next step in creating the domain will be adding dimensions. In the Sketching Toolboxes window, select Dimensions > General. First, click the left segment of the upper surface of the rectangle, then click off off of the geometry to place the dimension. Repeat this process for the right segment of the upper surface of the rectangle, then the left surface of the rectangle.

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