Author: Rajesh Bhaskaran & Yong Sheng Khoo, Cornell University

Problem Specification

1. Pre-Analysis & Start-up

2. Geometry

3. Mesh

4. Setup (Physics)

**5. Solution**

6. Results

7. Verification & Validation

Problem 1

Problem 2

## Step 5: Solution

Useful Information

These instructions are for FLUENT 12. Click here for instructions for FLUENT 6.3.26.

Now we will set the solve settings for this problem and then solve using an iterative approximation process.

**Under Solution**** ** **> Solution Methods**

We'll just use the defaults. Note that a second-order Upwind scheme will be used. Click ** OK**.

#### Set Initial Guess

**Main Menu > Solve > Initialization**

As you may recall from the previous tutorials, this is where we set the initial guess values for the iterative solution. We'll set these values to be the ones at the inlet, so under ** Compute From** select

**This will automatically set the initial values for all the cells. You can also type the values by hand and the results will be equivalent.**

*inlet.*

Click ** Initialize**. This completes the initialization.

#### Set Convergence Criteria

FLUENT reports a residual for each governing equation being solved during the iterative process. The residual is a measure of how well the current solution satisfies the discrete form of each governing equation. We'll iterate the solution until the residual for each equation falls below 1e-6.

**Main Menu > Solve > Monitors** or **Under Solution > Monitors**** ** select** ** **Residual**** ****> Edit**

Change the residual under ** Convergence Criterion** for

**,**

*continuity***,**

*x-velocity***and**

*y-velocity***to 1e-6.**

*energy*Also, under ** Options** select

**if is not selected yet. This will plot the residuals in the graphics window as they are calculated.**

*Plot*Click

**.**

*OK*#### Iterate Until Convergence

**Main Menu > Solve > Run calculation** or **Under Solution > Run Calculation**** **

In the *Iterate Window* that comes up, change the ** Number of Iterations** to

`500`

. Click **.**

*Calculate*The residuals are printed out as well as plotted in the graphics window for each iteration.

Save the case and data after you have obtained a converged solution by going to *File > Write > Case & Data*

Go to Step 6: Results