The Discontinuous Galerkin Time Domain (DGTD) methods are now popular for the solution of wave propagation problems. Able to deal with unstructured, possibly locally-refined meshes, they handle easily complex geometries and remain fully explicit with easy parallelization and extension to high orders of accuracy. Non-dissipative versions exist, where some discrete electromagnetic energy is exactly conserved. However, the stability limit of the methods, related to the smallest elements in the mesh,...
We investigate sufficient and possibly
necessary conditions for the
stability of the upwind first order
finite volume scheme for Maxwell equations, with metallic and
absorbing boundary conditions. We yield a very general sufficient condition,
valid for any finite volume partition in two and three space
dimensions. We show this condition is necessary for a class of
regular meshes in two space dimensions. However, numerical tests show
it is not necessary
in three space dimensions...
The Discontinuous Galerkin Time Domain (DGTD) methods are now popular for the solution of wave propagation problems. Able to deal with unstructured, possibly locally-refined meshes, they handle
easily complex geometries and remain fully explicit with easy parallelization and extension to high orders of accuracy. Non-dissipative versions exist, where some discrete electromagnetic energy is exactly conserved. However, the stability limit of the methods, related to the smallest elements in the mesh,...
We investigate unilateral contact problems with cohesive forces, leading to
the constrained minimization of a possibly nonconvex functional. We
analyze the mathematical structure of the minimization problem.
The problem is reformulated in terms of a three-field augmented
Lagrangian, and sufficient conditions for the existence of a local
saddle-point are derived. Then, we derive and analyze mixed finite
element approximations to the stationarity conditions of the three-field
augmented Lagrangian....
A Discontinuous Galerkin method is used for to the numerical solution of the time-domain Maxwell equations on unstructured meshes. The method relies on the choice of local basis functions, a centered mean approximation for the surface integrals and a second-order leap-frog scheme for advancing in time. The method is proved to be stable for cases with either metallic or absorbing boundary conditions, for a large class of basis functions. A discrete analog of the electromagnetic energy is conserved...
A Discontinuous Galerkin method is used for to the
numerical solution of the time-domain Maxwell equations on
unstructured meshes. The method relies on the choice of local basis
functions, a centered mean approximation for the surface integrals
and a second-order leap-frog scheme for advancing in time. The method
is proved to be stable for cases with either metallic or absorbing
boundary conditions, for a large class of basis functions. A
discrete analog of the electromagnetic energy is conserved...
Download Results (CSV)