FLUENT - Forced Convection - Step 6

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Step 6: Results

In Workbench save your project. In Project Schematic window, double click on Results to open CFD-Post.

Overview

Again, like previous section, we see familiar Outline tab on the left that display various results of interest. On the right, we have the Graphics window.

Temperature Contour

Let's first look at temperature Contour. On the top menu, click on contour . Enter name "Temperature Contour" and press OK. On the left hand side, under Details of Temperature Contour, select the appropriate parameter to obtain the result we want. Next to Locations, select periodic 1. Select Temperature for Variable. Enter 100 for # of Contours.

Next, click on the View tab. We would like to specify the look of the contour plot. Select Apply Reflection/Mirroring. Select ZX Plane next to Method. This will reflect our model in the ZX Plane and enable us to look at the temperature contour at the cross section of of the pipe. Next, select Apply Scale. Enter 30 for y-axis. This will stretch our model in the y direction. This will enable us to better view how the flow is mixed in the whole pipe. Finally click Apply.

After you click Apply, you will see that under Outline > User Locations and Plots, Temperature Contour is created. You will also see that the Temperature Contour is plotted in the Graphics window on the right. Under Outline > User Locations and Plots, uncheck Wireframe to see just the Temperature Contour in the Graphics window.

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Is the flow well mixed at the end of adiabatic mixing section?

Velocity Vectors

On the top menu, click on vector . Name it "Velocity Vector" and click OK. Under Details of Velocity Vector, select periodic 1 next to Locations.

Next, we will specify how the arrow will appear. Click on Symbol tab. Enter 0.05 for Symbol Size.

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

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Velocity vectors in the first section showing flow development.

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.

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 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.

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.

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

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

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.

This is what you should see in the Graphics window.

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Does the simulation result compares well with the experimental data?

Centerline Temperature Plot

Now let's look at the temperature variation along the centerline.

Insert > Chart
Enter "Centerline Temperature" as Name. You will see Details of Centerline Temperature appear on the lower left panel. Under General, give the chart Title as "Temperature 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.

We would also like to compare our simulation result with experimental data. Experimental data is can be downloaded Experimental Centerline Temperature.csv 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.

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

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

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.