Sign-up for free online course on ANSYS simulations!...
The FLUENT result is shown in the Graphics window.
Axial Velocity Profile
...
Now, let's investigate the velocity profile at different lengths along the pipe. We are especially interested in the flow development before it enters the heated section. Then please divert your attention to the difference heat addition has on flow development.
...
Axial Velocity Profile before Heated Section
...
The heated section is from x-positions of 1.83m to 4.27m. To allow us insight into flow development before the heated section, we will begin by creating 4 lines of x-position less than 1.83m.
Insert > Location > Line
The first line will be to define the inlet. Accordingly, please name this line "Inlet" and click OK. On the lower left panel, you will see Details of Inlet. Enter the following coordinates. The coordinates are entered in terms of (x,y,z).
Point 1 (0,0,0)
Point 2 (0,0.0294,0)
We want to create a vertical line, parallel to the y axis, so check to make sure that the x and z coordinates are the same for both points.
Enter 50 for Samples.
Click Apply.
Please repeat the process for Preheat 1 (x = 0.6) Preheat 2 (x=1.2) and 3 (x=1.8)
To double check, the coordinates for the 4 lines should be:
| Point 1 | Point 2 |
|---|---|---|
Inlet | (0,0,0) | (0,0.0294,0) |
Preheat1 | (0.6,0,0) | (0.6,0.0294,0) |
Preheat2 | (1.2,0,0) | (1.2,0.0294,0) |
Preheat3 | (1.8,0,0) | (1.8,0.0294,0) |
Check that you have the following under Outline.
...
before
...
and
...
after Heated Section
Let
...
Now we will specify the X Axis parameter. Click on X Axis tab. Next to Variable, choose Velocity u. Next we will specify the Y Axis parameter. Click on Y Axis tab. Next to Variable, choose Y. Click Apply. You will see First Section Axial Velocity Profile created under Report in the Outline tab.
This is what you should see in the Graphics window.
Notice preheat 2 and preheat 3 lines yield almost the same velocity profile. This tells us that after preheat 2, the flow his almost fully developed.
Axial Velocity Profile before and after Heated Section
To make things more interesting, let's now compare the velocity profiles before and after the heated section. To do this, we need to first create lines after heated section
...