Dynamic solutions for a fluid world™

AFT President & Founder | ASME Fellow - Trey founded AFT in 1993. He was the original developer of AFT Fathom (including the GSC and XTS modules), AFT Arrow and AFT Impulse. He was active in software development until 2011 and still works with the development team in addition to managing AFT. He has taught hundreds of training classes on AFT’s ...software products in twelve countries across every populated continent. He worked previously for General Dynamics in cryogenic rocket design and Babcock & Wilcox in steam/water equipment design. He holds a BSME (1985) and MSME (1986), both from the University of California, Santa Barbara. He is a registered Professional Engineer.   More
Trey Walters

A Triple Choke Example: Why Getting Choked Flow Right Matters

With the release of AFT Arrow 6 last month, this month I am going to depart from my usual monthly high level focus and instead get more detailed technically on compressible pipe flow. I am going to revive a topic from 1996 where we built a "Triple Choke" steam flow model in AFT Arrow 1.0 . This model is discussed in our AFT Arrow training seminars , so those of you have attended one of these will have seen it. It also has been part of the AFT Arrow Help system documentation since at least 1999. There are three geometric situations...
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Trey Walters
A bit delayed answer - sorry - but we have found that converging exactly on M = 1 is very difficult during iterations - largely be... Read More
Thursday, 18 February 2016 01:09
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Trey Walters

AFT Arrow 6 is Gassed Up and Ready to Go!

AFT Arrow 6 was released yesterday. As usual, we have lots of cool new features to help our customers be more productive than ever. Let's start with my favorite my new feature. Well, actually it is a collection of new features - all related to graphing. New Graphing Features First, AFT Arrow now has the ability to display multiple graphs simultaneously. For example, see screen show below. Second, AFT Arrow can remember all the graphs in a new Graph List Manager. This replaces and expands the previous graph retention feature which was called graph sets. Third, graph generation capability has been...
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Trey Walters

AFT Arrow Turns 20 This Month - the Behind the Scenes Story

When I started AFT back in 1994 I had the idea to develop a product for compressible flow in pipe systems. After AFT Fathom 1.0 was released in April 1994  I began research on numerical methods for compressible flow in pipe networks. Books and papers that claimed to offer methods for compressible flow inevitably focused on single pipe applications with adiabatic or isothermal flow - and often with ideal gases. I wanted to develop a real gas software that could model heat transfer and simulate pipe networks.  Eventually I gave up looking for published methods and set it aside to focus...
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Trey Walters

Mars, Martians and the Marvelous March to Space

Unless you happen to be marooned somewhere on Jupiter or beyond it has been hard to miss all the talk about Mars in recent days and weeks. What actually is on Mars? Water? Life? Can we send humans to Mars? Should we send humans to Mars? If we can and should, how can and should we do it?  Perhaps a good place to start is this video I highly recommend watching - " Guys build amazing 7-mile-long model of the solar system, to scale ". As I watched the video it brought back vivid memories of grade school for me. My...
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Trey Walters

A Personal Experience: The Mismatched Compressor and Air Distribution System in My Home

Mismatched fluid handling machinery and the systems they service are a frequent occurance in industrial, municipal and commercial fluid transfer installations. And, as I found out this morning, in residential installations. Specifically, in the residential installation in which I personally live. Two summers ago I bought a new home in the Colorado Spring area. It has an air conditioning unit that only distributes air to the upstairs. Upstairs has only bedrooms and a bathroom. Colorado Springs is a beautiful city that sits at the base of the world famous Pikes Peak . The local elevation of the city is 6000 ft...
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Trey Walters

Making the Most of Your Extra Time

"Who has extra time?", you ask. Well, at least for today, we all do. Because today is the day on which a "leap second" will be added - according to this article in TIME magazine . But you can find extra time in other ways that do not depend an calendar adjustments. That time is found by accomplishing your assigned engineering tasks in less time. And that is where AFT software can and does help engineering companies in 70+ countries around the world. Below is a list of the top five ways AFT software saves engineers time: Top Five Ways AFT...
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Trey Walters

The Cool, New Features Coming Soon in AFT Fathom 9

I like cool new features in software. And I am especially proud of those in the upcoming AFT Fathom 9. We expect this new version to be available in the next two months. Below I will touch on some of the new features I think will be of most interest to you. Graphing Let me start by talking about my favorite new feature in AFT Fathom 9. Namely, the new graphing capabilities. Here is a summary of what to expect: Multiple graphs can be displayed concurrently in various forms including stacking and tiling Graphs are persistent and automatically updated when the...
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