Relaxation method
From Glossary of Meteorology
relaxation method
An iterative numerical method for solving elliptic partial differential equations.
For example, a Poisson equation, ∇2φ = F(x, y), where ∇2 is the Laplacian operator and the function F(x, y) is given.
Panofsky, H. 1956. Introduction to Dynamic Meteorology. 168–174.