Page 313 - Process Modelling and Simulation With Finite Element Methods

300 Process Modelling and Simulation with Finite Element Methods

Before setting up the problem, we need to define all the constants to be used in
the simulation. Pull down the Options menu and select Add/Edit constants.
The AddEdit constants dialog box appears.
Add/Edit Constants

0 Name of constant: rhod Expression: 1
0 Name of constant: rhoc Expression: 10
0 Name of constant: nu Expression: 1
Name of constant: gy Expression: -10
Name of constant: dadd Expression: 0.005
0 Name of constant: n Expression: 100
0 Name of constant: sigma Expression: 1
0 Apply / OK
It is useful to define some expressions, i.e. intermediate variables, to make the
FEM data entry more concise. Pull down the Options menu and select AddEdit
expressions. Expressions can be functions of the dependent variables (u,v,p,
and phi). Contant expressions can be defined in the AddEdit Constants
dialogue box.

Add/Edit Expressions
0 Variable name: smhs
Variable type: subdomain then Add
0
Now click on the definition tab
0
0 Enter expression: (l+tan(n*phi))/2
Variable name: smdelta
0
Variable type: subdomain then Add
0
Now click on the definition tab.
Enter expression: n/sqrt(pi)*exp(-nA2*phiA2)
0 Variable name: kappa
Variable type: subdomain then Add
0
0 Now click on the definition tab
Enter expression: (phiyA2*phixx-2*phix*phiy*phixy
0
+phiyy*phix"2)/(phixA2+phiyA2)"( 3/2)
0 Variable name: rO
Variable type: subdomain then Add
0
Now click on the definition tab
Enter expression: rhod + rhoc*smhs
0 Apply
0 OK