Page 178 - Process Modelling and Simulation With Finite Element Methods

Extended Multiphysics 165

us vs WS
r 0 0 0
F ku*(U-US)-kv*(V-VS) ku*(U-US)+kw*(W-WS) US*VS-K*WS
da 0 0 0
init sheetus(x) sheetus(x) sheetws(x)

Before we move on to linking the models, we need to scale our buffer tank initial
concentrations.
Now pull down the Subdomain menu and select Subdomain settings.

Subdomain Mode
cl: Select domain 1 & 2; select the init tab; set cl(tO)=InitU
c2: Select domain 1 & 2; select the init tab; set c2(tO)=InitV
ns: Select domain 1 & 2; set Fy= -0.25*(cl+c2)
0 Select the init tab; set u(tO)=u3*tanku(x,y); v(t0)=~3*tankv(x,y);
p(tO)= u3"2*tankp(x,y)
Apply
OK
Now for the hard part again. Extended multiphysics means coupling variables.
Pull down the Options menu and select Add/Edit Coupling Variables. Enter
the seven coupling variables as below:

AddIEdit Coupling Variables

Apply
0 OK
Clearly, there are still undefined expressions above, which are conveniently
defined in the Add/Edit Expressions selection of the Options menu.