This report presents a detailed description of the Marker-And-Cell (MAC) technique developed at Los Alamos for solving fluid flow problems. The method is appropriate for use with a high-speed digital computer. The fluid is incompressible, viscous, and moves through large-amplitude contortions in several space dimensions. There may be a free surface upon which waves can form and break, or the flow may be entirely confined by walls. Development of the fluid configuration can be investigated through as much elapsed time as desired. The only approximations arise from the finite-difference representation.
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