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• FLUENT - Laminar Pipe Flow - Problem 2

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## Problem 2

#### Problem

On your finest mesh (100x20), rerun the FLUENT calculation for Reynolds numbers 200 and 500 using the "second-order upwind" scheme. Note: change the Reynolds number by adjusting the molecular viscosity µ. Plot the centerline velocity and skin friction as a function of axial distance for Re = 100 (previous problem), 200, and 500. Plot all three cases on the same graph for comparsion. Briefly explain the trend you observe as the Reynolds number increases.

#### Hints

If you've saved the 100x20 mesh in step 7, you can load it into FLUENT again without having to recreate it in GAMBIT.

Solve for µ for each of the Reynolds number first and then think about what steps need to be changed.

#### Solution

Your solution should look something like the plots below:

Centerline Velocity

newwindow
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https://confluence.cornell.edu/download/attachments/85624219/ps2velfull.JPG?version=1

Skin Coefficient

newwindow
 Higher Resolution Image Higher Resolution Image
https://confluence.cornell.edu/download/attachments/85624219/ps2cffull.JPG?version=1