This edited volume offers a state of the art overview of fast and robust solvers for the
Helmholtz equation. The book consists of three parts:new developments and analysis in Helmholtz
solvers practical methods and implementations of Helmholtz solvers and industrial
applications.The Helmholtz equation appears in a wide range of science and engineering
disciplines in which wave propagation is modeled. Examples are: seismic inversion ultrasone
medical imaging sonar detection of submarines waves in harbours and many more. The partial
differential equation looks simple but is hard to solve. In order to approximate the solution
of the problem numerical methods are needed. First a discretization is done. Various methods
can be used: (high order) Finite Difference Method Finite Element Method Discontinuous
Galerkin Method and Boundary Element Method. The resulting linear system is large where the
size of the problem increases with increasing frequency. Due tohigher frequencies the seismic
images need to be more detailed and therefore lead to numerical problems of a larger scale.
To solve these three dimensional problems fast and robust iterative solvers are required.
However for standard iterative methods the number of iterations to solve the system becomes too
large. For these reason a number of new methods are developed to overcome this hurdle.The book
is meant for researchers both from academia and industry and graduate students. A prerequisite
is knowledge on partial differential equations and numerical linear algebra.
