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  • Forced Convection - Pre-Analysis & Start-Up

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Step 1: Pre-Analysis & Start-Up

Since the pipe cross-section is circular and heat is applied in an axisymmetric manner, we'll assume that the flow is axisymmetric. In cylindrical polar coordinates, this means that the flow variables depend only on the axial coordinate x and radial coordinate r, and are independent of the azimuthal coordinate θ. Hence we can model the pipe problem with a rectangular domain.

Here R = radius of the pipe, and L = length of the pipe. Rotating the above rectangle 360 degrees about the axis will recover the full pipe geometry.

Start ANSYS FLUENT

We'll run FLUENT within the ANSYS Workbench interface. Start ANSYS workbench:

Start > All Programs > ANSYS 12.0 > Workbench

Following figure shows the workbench window.

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At the left hand side of the workbench window, you will see a toolbox full of various analysis systems. In the middle, you see an empty work space. This is the place where you will organize your project. At the bottom of the window, you see messages from ANSYS.

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:

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

Now, we just need to work out each step from top down to get to the results for our solution.

  • We start by preparing our geometry
  • We use geometry to generate a mesh
  • We setup the physics of the problem
  • We run the problem in the solver to generate a solution
  • Finally, we post process the solution to gain insight into the results

Note to Cornell students enrolled in MAE 4272, Fall 2009: You can skip the geometry and mesh steps. Download the mesh by right-clicking here and saving the zip file to a convenient location. Unzip the file. This will create a file called pipe.wbpj and a folder called pipe_files. read in the mesh into Workbench using File > Open. Then skip to Step 4: Setup (Physics).

Go to Step 2: Geometry

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