Cactus

• Computational framework for solving PDEs (originally in numerical relativity and astrophysics)

• Modular framework for creating portable parallel simulation codes.

• Numerical relativity, very high computational requirements

• Finite differences code.

• Regular unigrid mesh.

• Distributed memory model

• xi,j(t+1) = F(xi+1,j(t), xi-1,j(t), xi,j+1(t), xi,j-1(t))

Gravitational waves

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