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"The ideal engineer is a composite ... He is not a scientist, he is not a mathematician, he is not a sociologist or a writer; but he may use the knowledge and techniques of any or all of these disciplines in solving engineering problems."
- N. W. Dougherty, 1955

Letter from the Editor

With recession still on everyone’s mind and progress seemingly being made, it is natural to ponder what exactly has led to recovery. Many pundits have pointed their fingers at businesses that are prospering and say it is because of gains in efficiency and productivity. Certainly these are desirable properties in any business or activity that hopes to be successful. Flow Science is no exception. New capabilities and improved algorithms are constantly being created by our developers to provide faster, more accurate and less memory hogging simulations.

In this issue there are two articles describing ways users can get more out of their modeling efforts, which can increase their productivity. The development article describes entirely new capabilities for creating more efficient computational grids. One development allows for the combining of coarse and fine grids in situations where a change in resolution is acceptable. The boundary between the fine and coarse grids can conform to quite general geometric shapes. The second development allows for multiple grid blocks to be connected to a single, larger grid boundary, which allows for more flexibility in defining multiple grid blocks.

A second example of increased efficiency is described in the Hints & Tips section that describes how the implicit advection of momentum can be optimized for speed and accuracy. Optimization uses newly-added input quantities for velocity magnitude or time-step size that will control the amount of implicitness in a simulation. The most important point of this article is to demonstrate that it is necessary to balance speed up with accuracy in order to obtain useful results.

Lastly, this issue's application article from users at Engevix describes how simulations provided fast and reliable answers to a variety of difficult flow problems associated with water power generation. Another example of productivity gains possible from the application of the advanced technology provided by FLOW-3D.

If you enjoy learning about Flow Science's developments and about how FLOW-3D users apply the software to many different industrial applications, why not join us in Chicago this September at the 2013 FLOW-3D World Users Conference? We think it would be an efficient, productive and enjoyable use of your time.

Your editor,

Editor's Signature

Tony Hirt