The General Flux/Source node, found under the More submenu, adds the most general boundary condition for the elastic waves equation, as it is formulated (in the conservative form) for the discontinuous Galerkin method (dG). The condition defines the normal flux g at an exterior boundary. Care should be taken when using this advanced condition as the method is sensitive to proper formulation of boundary conditions. Only one characteristic can enter the domain at any boundary at the time, meaning that it is easy to over-specify the problem.

Enter the expression for the components of the Flux vector g.