Changed initial conditions to fixed initial
Added initialization in constrainedby declaration.

This is for #248. It was done so that examples that extend this base class inherit this setting.
Updated initial conditions.

This is for #248.
Added new examples and update reference results.

This is for #248.
Changed medium to air and water.

This is for #248
Revised flow distribution for discretized coil.

This is for #248.
The new formulation leads to a smaller system of coupled equations.