FLUENT - Forced Convection - Step 2

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Step 2: Geometry

Since our problem involves fluid flow, we will select the FLUENT component on the left panel.

Left click (and hold) on Fluid Flow (FLUENT), and drag the icon to the empty space in the Project Schematic. Here's what you get:

Since we selected Fluid Flow (FLUENT), each cell of the system corresponds to a step in the process of performing CFD analysis using FLUENT. Rename the project to Forced Convection.

We will work through each step from top down to get to obtain the solution to our problem.

In the Project Schematic of Workbench window, right click on Geometry and select Properties. You will see the properties menu on the right of the Workbench window. Under Advance Geometry Options, change the Analysis Type to 2D.

In the Project Schematic, double left click on Geometry to start preparing the geometry. After you launch the web tutorials and FLUENT, you will have to drag the browser window to the width of the largest image (about 350 pixels). To make best use of screen real estate, move the windows around and resize them so that you approximate

this screen arrangement

At this point, a new window, ANSYS Design Modeler will be opened. You will be asked to select desired length unit. Use the default meter unit and click OK.

Creating a Sketch

Start by creating a sketch on the XYPlane. Under Tree Outline, select XYPlane, then click on Sketching right before Details View. This will bring up the Sketching Toolboxes.

Click Here for Select Sketching Toolboxes Demo

Click on the +Z axis on the bottom right corner of the Graphics window to have a normal look of the XY Plane.

Click Here for Select Normal View Demo

 In the Sketching toolboxes, select Rectangle. In the Graphics window, create a rough Rectangle from starting from the origin in the positive XY direction (Make sure that you see a letter P at the origin before you start dragging the rectangle. The letter P at the origin means the geometry is constrained at the origin.)

You should have something like this:

Note: You do not have to worry about geometry for now, we can dimension them properly in the later step.

Modify the Sketch

Since we have a heated section in the middle of the pipe, we need to split the geometry appropriately. Click Modify tab and select Split. Roughly select two points on the top and bottom of the rectangle where there will be a heated section.

Now we can constraint the lower rectangle with the top of the rectangle. Click Constraints tab, select Equal Length. Click the appropriate top and bottom edge and set them to be of equal length. This is shown below:

Dimensions and Constraints

Now we will specify the appropriate dimensions and constraints. Below is the summary of geometry of the pipe:

Radius: 0.0294 m
Length: 6.096 m
Heated Section: 1.83 m - 4.27 m

Under Sketching Toolboxes, select Dimensions tab, use the default dimensioning tools. Then click on the lines and drag upwards or sideways as the case may be to place the dimensions (V1, H2, H3, H4). Note: For horizontal dimensioning (shown in H2, H3 and H4), click first on the horizontal dimension tab under the dimensions tab and then click (turns yellow) on the end points of the split section lines (H2, H3 and H4). Then click on any point on the y-axis and drag up. For the vertical dimensioning (V1), click on the vertical dimension tab under the dimensions tab. Then click on the any point on the x-axis then click on V1 (turns yellow). Then drag V1 to the left side.

Dimensioning of the geometry is shown below:

Under Details View on the lower left corner, input the value for dimension appropriately. Then hit enter each time each dimension is entered.
V1: 0.0294 m
H2: 1.83 m
H3: 4.27 m
H4: 6.096 m

At this point, you should see something like this for your sketch:

Now that we have the sketch done, we can create a surface for this sketch.

Then click on Concept tab in the Design modeler window, then click on Surface from sketches.

This will create a new surface SurfaceSK1. Under the Tree Outline, click on the X-Y Plane  and select Sketch1 as Base Objects and under Details View, click Apply. Finally click Generate to generate the surface.

Click Here for Create Surface Demo

  You can close the Design Modeler and go back to Workbench (Don't worry, it will auto save).
 
Go to Step 3: Mesh

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