Page History

...

Finally click Apply. You will see that under Outline > User Locations and Plots, Velocity Vector is created. Uncheck Un-check Temperature Contour so that Graphics window shows just the Velocity Vector plot.

...

Now let's look at the temperature variation along the center-line of the pipe. In the experiment, we are only able to measure the temperature at two points. First, at the inlet of the pipe and second, after the adiabatic mixing stage. The simulation can show us the variation of temperate in between these two points.

To create the desired plot:

Insert > Chart 
Please name this chart "Centerline Temperature". You will see Details of Centerline Temperature appear on the lower left panel. Select the General tab and name the chart "Temperature Variation along Pipe Axis".
Image Removed
Moving on, please select the Data Series tab. This tab will help us specify the source of the chart data. Create a new data series Image Removed.  Change the name from Series 1 to FLUENT. Under Data Source, specify Centerline as Location. Click Apply. This should result in a plot like:

\[insert the picture here\]

We would like to verify our simulation results, to do this we are comparing to experimental data. Experimental data is can be downloaded here. Download it to a directory of your choice. Now, click a new data series Image Removed. Name it "Experiment". Under Data Source, select File and browse for the downloaded experimental data.

Image Removed

To do this we need to first create a center-line:

Insert > Location > Line

Name it "Centerline" and click OK. On the lower left panel, you will see Details of Centerline. Enter the following coordinates.

Point 1 (0,0,0)

Point 2 (6.096,0,0)

Enter 50 for Samples. (This will be the number of sample points used when plotting data)

Click Apply.

Image Added

You will see centerline created under User Locations and Plots.

In the experiment, we are only able to measure the temperature at two points. First, at the inlet of the pipe and second, after the adiabatic mixing stage. The simulation can show us the variation of temperate in between these two points.

To create the desired plot:

Insert > Chart 
Please name this chart "Centerline Temperature". You will see Details of Centerline Temperature appear on the lower left panel. Select the General tab and name the chart "Temperature Variation along Pipe Axis".
Image Added
Moving on, please select the Data Series tab. This tab will help us specify the source of the chart data. Create a new data series Image Added.  Change the name from Series 1 to FLUENT. Under Data Source, specify Centerline as Location. Click Apply. This should result in a plot like:

\[insert the picture here\]

We would like to verify our simulation results, to do this we are comparing to experimental data. Experimental data is can be downloaded here. Download it to a directory of your choice. Now, click a new data series Image Added. Name it "Experiment". Under Data Source, select File and browse for the downloaded experimental data.

Image Added

Now that we have our data sources, we will proceed by specifying the axes. We want to see the variation of temperature with the length of the Now that we have our data sources, we will proceed by specifying the axes. We want to see the variation of temperature with the length of the pipe. Therefore, temperature will be on the y axis of the chart and x-position on the x axis of the chart. We will start by defining the X-axis:

...

 Click on Y Axis tab. Next to Variable, choose Temperature.

 
Now we will specify how we want to the chart to display. The default setting is to display the data series in lines. Since we only have 3 experimental points, we want them to be displayed in data points. Click on Line Display. Then click on experimental tab. Next to Line Style, change Automatic to None. Next to Symbols, change None to Diamond. Change the color to red. Click Apply. You will see Axial Pressure created under Report in the Outline tab.
Image Removed
 
This is what you should see in the Graphics window.
Image Removed

...

https://confluence.cornell.edu/download/attachments/111221576/Wall%20Temperature.png

Symbols, change None to Diamond. Change the color to red. Click Apply.
Image Added
 

This is what you should see in the Graphics window.
Image Added

https://confluence.cornell.edu/download/attachments/111221576/Wall%20Temperature.png

Although the experimental data are a fairly good match for what the simulation has predicted, the wall temperature in the experiment seems to be consistently higher than the simulation in the heated section.

Pressure Plot

Now let's us look at the pressure variation at the centerline. We can use the center-line we created earlier

Does the simulation result compares well with the experimental data?

Pressure Plot

Now let's us look at the pressure variation at the centerline. First, we will create a line call centerline.

Insert > Location > Line

Name it "Centerline" and click OK. On the lower left panel, you will see Details of Centerline. Enter the following coordinates.

Point 1 (0,0,0)

Point 2 (6.096,0,0)

Enter 50 for Samples. (This will be the number of sample points used when plotting data)

Click Apply.

Image Removed
You will see centerline created under User Locations and Plots.

Next, we will create a chart using this Location data. 
Insert > Chart 
Enter "Axial Pressure" as Name. You will see Details of Axial Pressure appear on the lower left panel. Under General, give name the chart Title as "Pressure Variation along Pipe Axis".

Now click on Data Series tap to specify the location of the chart data. Create a new data series .  Change the name from Series 1 to FLUENT. Under Data Source, specify Centerline as Location.name from Series 1 to FLUENT. Under Data Source, specify Centerline as Location. The centerline was already created while doing the temperature variation along the center-line. If that chart was skipped please refer to that section on how to create a centerline.

We would also like to compare our simulation result with experimental data. Experimental data is can be downloaded here. Download it to the directory that you like. Now, click a new data series . Name it Experiment. Under Data Source, select File and browse to the downloaded experimental data.
Image Removed
and browse for the downloaded experimental data.
Image Added

Our purpose in this exercise is to study the pressure variation along the length of the pipe. Therefore our chart should show pressure in the y-axis and x-position in the x-axis.

Now we will specify the X Axis parameter. Click on X Axis tab. Next to Variable, choose X.

...

This is what you should see in the Graphics window.

https://confluence.cornell.edu/download/attachments/111221576/centerline%20pressure.png

Does the simulation result compares well with the experimental data? The simulation results follow the experimental data quite closely, the general trend is that pressure decreases (almost linearly) as we move from the inlet towards the outlet of the pipe.

Axial Velocity Profile

Now let's us look at the axial velocity profile at various location in the pipe. We are interested in the flow development before the heated section and would like to observe how heat addition in the heated section will affect the flow development. To do this, let's start with investigation the flow before the heated section.

...