Transport of Diluted Species
Now set up the mass transport physics features.
Transport of Diluted Species (tds)
Start by raising the element order to quadratic in order to match the discretization for the velocity. The default discretization for Creeping Flow is P2+P1.
1
In the Model Builder, under Component 1 click Transport of Diluted Species (tds).
2
In the Settings window for Transport of Diluted Species, click to expand the Discretization section.
3
From the Concentration list, choose Quadratic.
Transport Properties 1
The diffusion coefficient is set to use the parameter previously defined.
1
In the Model Builder, under Component 1 > Transport of Diluted Species (tds) node click Fluid 1.
2
Locate the Diffusion section. In the Dc text field, enter D.
Note that the velocity field for the species convection is controlled by the Reacting Flow, Diluted Species multiphysics coupling.
Concentration 1
Specify the concentration at the two inlets.
1
In the Physics toolbar, click Boundaries and choose Concentration.
2
Select Boundary 2 only.
3
In the Settings window for Concentration, locate the Concentration section. Select the Species c checkbox.
4
In the c0,c text field, enter c0.
Concentration 2
1
In the Physics toolbar, click Boundaries and choose Concentration.
2
Select Boundary 10 only.
3
In the Settings window for Concentration, locate the Concentration section. Select the Species c checkbox.
In this case the concentration should take the default value of 0.
Outflow 1
Use the outflow condition to allow species to leave the domain by convection. Since we will ultimately be interested in the weighted average concentration, add two Outflow features, each of which will provide its own value.
1
In the Physics toolbar click Boundaries and choose Outflow.
2
In the Settings window for Outflow, locate the Boundary Selection section.
3
Click Paste Selection .
4
In the Paste Selection dialog, type 23 in the Selection text field.
5
Click OK.
Outflow 2
1
In the Physics toolbar click Boundaries and choose Outflow.
2
In the Settings window for Outflow, locate the Boundary Selection section.
3
Click Paste Selection .
4
In the Paste Selection dialog, type 25 in the Selection text field.
5
Click OK.