Displacement Field Condition¶
The displacement field condition sets a specific value of the normal component of the electric displacement field \(\mathbf{D}=\varepsilon\mathbf{E}\) at the selected boundary:
\[
\left. \hat{\mathbf{n}} \cdot \mathbf{D} \right|_{\partial\Omega} = D_0,
\]
where \(\partial\Omega\) is the given boundary with the unit normal \(\hat{\mathbf{n}}\) and \(D_0\) is the desired value of the normal component of the displacement field.