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FLUENT - Laminar Pipe Flow - SolutionAdded by Javier Gutierrez Gallardo , last edited by Rajesh Bhaskaran on Nov 18, 2013 15:10
Author: Rajesh Bhaskaran, John Singleton, Cornell University
Problem Specification
1. Pre-Analysis & Start-Up
2. Geometry
3. Mesh
4. Setup (Physics)
5. Solution
6. Results
7. Verification & Validation
Exercises
Useful Information
Click here for the FLUENT 6.3.26 version.
Step 5: Solution
Second Order Scheme
A second-order discretization scheme will be used to approximate the solution. In order to
implement the second order scheme click on Solution Methods then click on Momentum
and select Second Order Upwind as shown in the image below.
Search Cornell
Edit
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09/01/2014 FLUENT - Laminar Pipe Flow - Solution - Simulation - Confluence
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Set Initial Guess
Here, the flow field will be initialized to the values at the inlet. In order to carry out the initialization
click on Solution Initialization then click on Compute from and select inlet as shown
below.
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09/01/2014 FLUENT - Laminar Pipe Flow - Solution - Simulation - Confluence
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Then, click the Initialize button, . This completes the initialization.
Set Convergence Criteria
FLUENT reports a residual for each governing equation being solved. 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. In order to specify the residual
criteria (Click) Monitors > Residuals > Edit..., as shown in the image below.
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Next, change the residual under Convergence Criterion for continuity, x-velocity,and y-
velocity, all to 1e-6, as can be seen below.
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Lastly, click OK to close the Residual Monitors menu.
Monitor Drag
The following video shows you how to monitor the drag coefficient during iterations in addition to
the default residuals. The equation for the drag coefficient is given in this pdf file.
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Execute Calculation
Prior, to running the calculation the maximum number of iterations must be set. To specify the
maximum number of iterations click on Run Calculation then set the Number of I terations
to 100, as shown in the image below.
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As a safeguard save the project now. Now, click on Calculate two times in order to run the
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09/01/2014 FLUENT - Laminar Pipe Flow - Solution - Simulation - Confluence
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calculation. The residuals for each iteration are printed out as well as plotted in the graphics
window as they are calculated. After running the calculation, you should obtain the following
residual plot.
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The residuals fall below the specified convergence criterion of 1e-6 in about 48 iterations, as
shown below. Actual number of convergence steps may vary slightly.
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At this point, save the project once again.
Go to Step 6: Results
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