SIMPLE algorithm
Encyclopedia
In computational fluid dynamics
Computational fluid dynamics
Computational fluid dynamics, usually abbreviated as CFD, is a branch of fluid mechanics that uses numerical methods and algorithms to solve and analyze problems that involve fluid flows. Computers are used to perform the calculations required to simulate the interaction of liquids and gases with...

 (CFD), SIMPLE algorithm is a widely used numerical procedure to solve the Navier-Stokes equations. SIMPLE is an acronym for Semi-Implicit Method for Pressure Linked Equations.

The SIMPLE algorithm was developed by Prof. Brian Spalding
Brian Spalding
Dudley Brian Spalding, FRS was a Professor of Heat Transfer at Imperial College, London. He is one of the influential persons in the development of computational fluid dynamics . In 1983, he became a Fellow of the Royal Society....

 and his student Suhas Patankar
Suhas Patankar
Suhas V. Patankar is an Indian-American mechanical engineer. He is a pioneer in the field of computational fluid dynamics and Finite volume method. He is currently an Professor Emeritus at the University of Minnesota. He is also president of Innovative Research, Inc...

 at Imperial College
Imperial College London
Imperial College London is a public research university located in London, United Kingdom, specialising in science, engineering, business and medicine...

, London in the early 1970s. Since then it has been extensively used by many researchers to solve different kinds of fluid flow and heat transfer problems.

Many popular books on computational fluid dynamics discuss the SIMPLE algorithm in detail. This algorithm forms the basis of Commercial CFD packages.

A modified variant is the SIMPLER algorithm (SIMPLE Revised), that was introduced by Patankar in 1979.
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