Creeping Flow
Now set up the fully coupled problem. Add a new Fluid Properties node that will be used to set up the fully coupled problem. To make the viscosity a function of the species concentration simply enter an expression into the dynamic viscosity setting of the fluid properties node.
Fluid Properties: Uncoupled
1
In the Model Builder window, under Creeping Flow click Fluid Properties 1 .
2
In the Settings window for Fluid Properties, type Fluid Properties: Uncoupled in the Label text field.
Fluid Properties: Coupled
1
Right click Fluid Properties: Uncoupled and choose Duplicate .
2
n the Settings window for Fluid Properties, type Fluid Properties: Coupled in the Label text field.
3
In the Settings window for Fluid Properties, locate the Fluid Properties section.
4
From the μ list, choose User defined. In the associated text field, type 1e-3[Pa*s]*(1+alpha*c^2).
Deactivate the Fluid Properties: Coupled node in Study 1 to be able to reproduce the uncoupled results in the future. Then, add a new study to solve the fully coupled 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
Select the Modify model configuration for study step checkbox. Click to change the check mark to .
4
In the tree, select Component 1 (comp 1) >Creeping Flow (spf) > Fluid Properties: Coupled. Right click and choose Disable .