Study 1
Now set up a study to solve the problem. Initially it is assumed that the fluid flow and diffusion problems are uncoupled. In this case it makes sense to solve the fluid flow problem first and then to use the velocity field as an input for the diffusion problem. This will save time and memory, particularly since the diffusion problem is solved for three parameters.
1
In the Model Builder window, click Study 1 .
2
In the Settings window for Study, locate the Study Settings section. Clear the Generate default plots checkbox.
Since the study automatically generates a large number of default plots, default plots are disabled.
For Step 1, solve only the creeping flow problem.
Step 1: Stationary
1
In the Model Builder window, under Study 1 click Step 1: Stationary .
2
In the Settings window for Stationary, locate the Physics and Variables Selection section.
3
In the table, clear the Solve for checkbox for Transport of Diluted Species row in the Physics interface column. Click to change the check mark to , to remove the physics interface from Step 1: Stationary.
Add a second study step.
Step 2: Stationary 2
1
In the Study toolbar, click Study Steps and choose Stationary > Stationary .
Disable the solution of the creeping flow problem for this step.
2
In the Settings window for Stationary, locate the Physics and Variables Selection section.
3
In the table, clear the Solve for checkbox for Creeping Flow. Click to change the check mark to , to remove the physics interface from Step 2: Stationary 2.
Solve the diffusion problem for three values of the diffusion coefficient.
4
In the Settings window for Stationary, click to expand the Study Extensions section. Select the Auxiliary Sweep checkbox.
5
Click Add .
6
In the table, enter the following settings:
Parameter name
Parameter value list
Parameter unit
D (Diffusion constant)
1e-10 5e-11 1e-11
m^2/s
7
In the Home toolbar click Compute. .