Setup (Physics)

Update the Project and Open FLUENT

Before we open FLUENT, we need to update the project the import the mesh into FLUENT. To do this, click Update Project . When the project updates, double click Setup to open FLUENT.

Initial Settings

Before FLUENT launches, we will be prompted to set some options. In Options check the box next to Double Precision. If you have a dual processor, you can set the option under Processing Options to Parallel, and change the Number of Processes to 2.

Once the options are set, click OK.

Problem Setup - General

Now, FLUENT should open. We will begin setting up some options for the solver. In the left hand window, under Problem Setup, select General. The only option we need to change here will address the fact that pipe domain we created is axisymmetric. Under 2D Space, click the radio box next to Axisymmetric.

Models

In the outline window, click Models. We will need to utilize the energy equation in order to solve for the temperature. Under Models highligh Energy - Off and click Edit.... Now, the Energy window will launch. Check the box next to Energy Equation and hit OK.

Materials

In the Outline window, highlight Materials. In the Materials window, highlight Fluid, and click Create/Edit.... this will launch the Create/Edit Materials window; here we can specify the properties of the fluid. Set the Density to 1.2, the Specific Heat to 1000, the Thermal Conductivity to .02, and the Viscosity to 1.8e-5.

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Once finished, click Change/Create, then Close.

Boundary Conditions

Now we will specify the boundary conditions governing the problem. In the Outline window, highlight Boundary Conditions.

Centerline

Under Zone, highlight Centerline. Change the Type to axis. Confirm you are changing the selection, then leave the name as the default centerline.

Heated Wall

Under Zone, highlight heated_wall. The Type should have defaulted to wall. Next, click Edit.... Click the Thermal tab, and select the Heat Flux radio button. Change the Heat Flux (w/m2) to 37.5. Click OK.

Inlet

Under Zone, highlight inlet. The Type should have defaulted to velocity-inlet. Next, click Edit.... In the Momentum tab, change the Velocity Specification Method to Components, and specify the Axial Velocity to 0.1. Click OK

Isothermal Wall

Under Zone, highlight isothermal_wall. The Type should have defaulted to wall. Next, click Edit.... Click the Thermal tab, and select the Temperature radio button. Change the Temperature (k) to 300. Click OK.

Outlet

Under Zone, highlight outlet. The Type should have defaulted to pressure-outlet. Next, click Edit.... In the Momentum tab, ensure the Gauge Pressure is 0. Click OK.

Reference Values

In the Outline window, select Reference Values. Under Compute From, select Inlet. Ensure that the values displayed are the values we specified. We are now ready to setup the solution.

Go to Step 5 - Solution