Results
Add another surface dataset that points to the new solution.
Datasets
1
In the Model Builder window, under Results > Datasets right-click Surface 1 and choose Duplicate .
2
In the Settings window for Surface, locate the Data section. From the Dataset list, choose Study 2/Solution 3 (sol3).
Velocity (Coupled Flow)
Recreate the velocity, pressure, and concentration plots for the fully coupled problem.
1
In the Model Builder under Results, right-click Velocity (Uncoupled Flow) and choose Duplicate .
2
In the Settings window for 3D Plot Group, type Velocity (Coupled Flow) in the Label text field.
3
Locate the Data section. From the Dataset list, choose Study 2/Solution 3 (sol3).
4
In the Velocity (Coupled Flow) toolbar, click Plot .
There are significant differences in the flow pattern, although these are hard to see when comparing this plot with the similar one generated previously. The flow through a slice of the channel will be investigated in more detail later to better highlight these differences.
Pressure (Coupled Flow)
1
In the Model Builder window, under Results right-click Pressure (Uncoupled Flow) and choose Duplicate .
2
In the Settings window for 3D Plot Group, type Pressure (Coupled Flow) in the Label text field.
3
Locate the Data section. From the Dataset list, choose Surface 2.
4
In the 3D plot group toolbar, click Plot .
The pressure distribution in the channel has changed significantly as a result of the increased viscosity of the fluid that contains the added species. Thus the two inlets must be maintained at different pressures. This may be possible for a single stage, but it would significantly complicate the design of a multiple stage device.
Concentration (Coupled Flow)
1
In the Model Builder window, under Results right-click Concentration (Uncoupled Flow) and choose Duplicate .
2
In the Settings window for 3D Plot Group, type Concentration (Coupled Flow) in the Label text field.
3
Locate the Data section. From the Dataset list, choose Study 2/Solution 3 (sol 3).
4
In the Concentration (Coupled Flow) toolbar, click Plot .
The concentration distribution is affected only slightly by the coupling between the flow and the concentration.
Next add a cut plane dataset in the center of the channel, for both the uncoupled and fully coupled solutions. These will be used to visualize the change in the flow profile induced by the coupling.
Datasets
1
In the Results toolbar, click Cut Plane .
2
In the Settings window for Cut Plane, locate the Plane Data section. In the x-coordinates text field, type 70.
3
Under Datasets, right-click Cut Plane 1 and choose Duplicate .
4
In the Settings window for Cut Plane, locate the Data section. From the Dataset list, choose Study 2/Solution 3 (sol 3).
Velocity Comparison
Add a 2D contour plot of the velocity magnitude.
1
In the Results toolbar, click 2D Plot Group .
2
In the Settings window for 2D Plot Group, type Velocity Comparison in the Label text field.
3
Locate the Data section.
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From the Dataset list, choose Cut Plane 1.
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From the Parameter value (D (m2/s)) list, choose 5e-11.
4
Right-click Velocity Comparison and choose Contour .
5
In the Settings window for Contour, locate the Levels section. In the Total levels text field, type 5.
Create a duplicate contour plot, using the same colors and scales, but showing the coupled data.
6
Under Velocity Comparison, right click Contour 1 and choose Duplicate .
7
In the Settings window for Contour, locate the Data section. From the Dataset list, choose Cut Plane 2.
8
Click to expand the Title section. From the Title type list, choose None.
9
Locate the Coloring and Style section. Clear the Color legend checkbox.
10
Click to expand the Inherit Style section. From the Plot list, choose Contour 1.
11
In the Velocity Comparison toolbar, click Plot .
12
Click the Zoom Extents button  in the Graphics toolbar
Now it is possible to compare the velocity distributions more carefully. It is clear that the coupling has introduced an asymmetry into the flow pattern as a result of the higher viscosity in the fluid containing the dissolved species.
Finally compare the output concentration between the two solutions.
Global Evaluation 1
1
In the Results toolbar, click  Global Evaluation.
2
In the Settings window for Global Evaluation, click Replace Expression in the upper–right corner of the Expressions section. From the menu, choose Component 1 (comp 1) > Transport of Diluted Species > Outflow 2 > tds.out2.c0_avg_c - Average concentration - mol/m3.
3
Click the Evaluate button .
When the diffusion coefficient is 5×10-11 m2/s the mean concentration at the outlet is 0.448 mol/m2.
Global Evaluation 2
1
Under Derived Values, right-click Global Evaluation 1  and choose Duplicate .
2
In the Settings window for Global Evaluation, locate the Data section. From the Dataset list, choose Study 2/Solution 3 (sol3).
3
Right-click Global Evaluation 2 and choose Evaluate > New Table.
Only a small difference occurs in the output concentration as a result of the coupling between the problems. However, the coupling would make adding multiple stages of the device together much more difficult, as different pressures are required at the two inlets to obtain the same flow velocity in the two streams.