Page 335 - Process Modelling and Simulation With Finite Element Methods

322 Process Modelling and Simulation with Finite Element Methods

Load up FEMLAB and in the Model Navigator, Multiphysics tab, set up as
follows:

Model Navigator
Select Multiphysics tab, 2D
Select Incompressible Navier-Stokes variables u v p; ns mode >>
Select PDE general form, variable Y; species mode >>
Select PDE general form, variable phi; potential mode >>
Solver Type: time dependent
OK

Accept the default element shape and order for each mode.
Pull down the options menu and select Add/Edit constants. The AddEdit
constants dialog box appears.

AddEdit Constants
Define as follows:
Pec 30
Re 0.03
zel 1
betael 1
zetar 1
sigr 1

Pull down the Options menu and set the grid to (-1,4) x (-1,l). Pull down the
Draw menu.

Draw Mode
Select Draw Rectangle from the palette on the left.
Enter points (O,O), (3,0), (3,0.5), (0,OS). Click on the points to be sure
that you snapped to the grid or to edit them.
Apply/OK
Now pull down the Subdomain menu and select Subdomain settings.

Subdomain r F da
Modelsettings
Subdomain 1 p = 1; 7 = 1Re; Fx = 0; Fy = 0
(ns mode)
Subdomain 1 -( l/Pec)*Yx-betael*zel*Y*phix -u*Yx-v*Yy 1
(species mode) (space delimiter)
-( l/Pec)*Yy-betael*zel*Y *phiy