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a.Enter wall-bottom for Zone Name.

b.Click the Thermal tab.

i.Select Temperature in the Thermal Conditions list.

ii.Enter 400 K for Temperature.

These settings will specify a constant wall temperature of 400 K.

c.Click OK to close the Wall dialog box.

2.Set the boundary conditions for the top wall of the right tube (wall-3).

Setup → Boundary Conditions → wall-3 → Edit...

a.Enter wall-top for Zone Name.

b.Click the Thermal tab.

i.Select Temperature from the Thermal Conditions list.

ii.Enter 400 K for Temperature.

c.Click OK to close the Wall dialog box.

4.4.9. Solution

1. Set the solution parameters.

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Setup and Solution

Solution → Solution → Methods...

Retain the default settings.

2.Set the solution controls.

Solution → Controls → Controls...

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a.Retain the default values in the Pseudo Transient Explicit Relaxation Factors group box.

In some cases, the default Pseudo Transient Explicit Relaxation Factors may need to be reduced in order to prevent oscillation of residual values or stabilization of residual values above the convergence criteria. For additional information about setting Pseudo Transient Explicit Relaxation Factors, see

the Fluent User's Guide.

3.Enable the plotting of residuals during the calculation.

Solution → Reports → Residuals...

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Setup and Solution

a.Ensure Plot is enabled in the Options group box.

b.Click OK to close the Residual Monitors dialog box.

4.Initialize the solution.

You will first use the default Hybrid initialization method and then patch the fluid zone with the upstream temperature value.

a.Initialize using the default settings.

Solution → Initialization → Initialize

b.Patch the fluid zone with the bulk upstream temperature value.

The Hybrid Initialization method computes the initial flow field based on inlet and outlet boundary conditions. In this case we have periodic boundary conditions with a specified upstream bulk temperature. You will patch the initialized solution with this temperature value in order to improve convergence.

Solution → Initialization → Patch...

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i.Select Temperature in the Variable selection list.

ii.Enter 300 for Value (k).

Recall that the upstream bulk temperature, , is specified as 300 K.

iii.Select fluid-16 in the Zones to Patch selection list.

iv.Click Patch and close the Patch dialog box.

5.Save the case file (tubebank.cas.gz).

File → Write → Case...

6.Start the calculation by requesting 350 iterations.

Solution → Run Calculation

a.Enter 350 for No. of Iterations.

b.Click Calculate.

The solution will converge in approximately 120 iterations.

7.Save the case and data files (tubebank.cas.gz and tubebank.dat.gz).

File → Write → Case & Data...

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