Energy2D recommended in computational fluid dynamics textbook

Computational fluid dynamics (CFD) is an important research method that uses numerical 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 surfaces defined by boundary conditions. Today, almost every branch of engineering rely on CFD simulations for conceptual design and product design.

A recent textbook "Computational Fluid Dynamics, Second Edition: A Practical Approach" by Profs. Jiyuan Tu, Guan Heng Yeoh, and Chaoqun Liu has recommended Energy2D as "Shareware CFD" for beginners. Here is a quote from their excellent book:
"Nevertheless, first-time CFD users may wish to search the Internet to gain immediate access to an interactive CFD code. (Users may be required to register in order to freely access the interactive CFD code.) The website is http://energy.concord.org/energy2d/index.html provides simple CFD flow problems for first time users to solve and allows colorful graphic representation of the computed results."

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