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

Reaching to the Sky in Dubai

Until a week ago, when I thought of Khalifa Tower, I thought of the Mission Impossible (Ghost Protocol) movie with Tom Cruise' death-defying action scenes hanging off the outside of the building. Now, I think of my visit there a week ago. 

At 828 meters (2,717 ft) tall, Burj Khalifa (also known as Khalifa Tower) in Dubai, UAE, is the tallest building in the world – at the moment (more on that later).

As Khalifa Tower reaches to the sky physically, Dubai reaches to the sky metaphorically. I have visited about 30 countries and have never seen anything like it. Twenty years ago, there was mostly sand. And now?

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Trey Walters

We Have Some Really Kewl New Stuff For You in AFT Fathom 10!

We at AFT work hard. Why?

We put a lot of thought into our software features. Why?

We try hard to listen to what you, our customers, tell us you want. Why?

The answer to all three questions is the same... 

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Trey Walters

How a Russian Hydraulics Handbook Gained the Respect of the American Nuclear Industry

We are all shaped by our experiences as engineers. Our early experiences as young engineers are especially influential. 

I first worked in the aerospace industry for five years and then the nuclear industry for two years. At each of these companies we relied heavily on a handbook written originally in Russian by a Russian engineer. I am talking about the Handbook of Hydraulic Resistance by I.E. Idelchik. This book is my "go to" book on any unusual pipe system configuration hydraulic calculations and, especially, with calculations at tees and wyes.

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Trey Walters

What is Pogo and Why On Earth Would Anyone Want To Suppress It?

The time was almost 30 years ago and it is fair to say I was not quite out of the "still wet behind the ears" stage for an engineer. I had been working in industry for about three years and I was just given a project that would change my career direction and, in fact, my life. The project? I was assigned to evaluate a new concept Pogo suppressor on a cryogenic rocket engine liquid oxygen (LOX) feedline. 

How did I end up getting assigned this project? Well, I had a few things going for me at that stage of my career. Firstly was that my company division was on a massive hiring spree. Since I had been hired three years earlier my division had doubled in size. Fortuitously for me, that meant I was now in the upper 50% of seniority. Secondly, I had just had a performance review and I had casually told my immediate supervisor during the review that I would be interested in learning about waterhammer should the opportunity arise. Thirdly and finally, I had demonstrated a knack for solving tough analytical problems. What that meant is that I was in the enviable position of having my supervisors assign me to any problem that was out-of-the-ordinary and otherwise unusually difficult. The new Pogo suppressor was such a problem.

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Trey Walters

Star Wars vs. Star Trek: Which Is Better?

Last week I saw Star Wars: The Last Jedi. For the third time. If you have not seen it by now you probably do not care about it much, but nevertheless rest assured there are no spoilers here for The Last Jedi. I first saw it on opening day in December. Usually I would only see a Star Wars movie twice in theaters. But a circumstance came up with one of my sons and I ended up seeing it a third time. I am definitely a fan of Star Wars.

The original Star Trek was on television when I was in kindergarten. I was definitely a fan of the original series but I never had time to keep up with the following television series. I have seen all the Star Trek movies going back almost 40 years now.

So which is better?

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Trey Walters

Shhhh! Suppressing Sound Waves From Rocket and Space Shuttle Engines

In case you have not noticed, rockets can be really loud. Sound suppression on vertically launched rockets (and the Space Shuttle, back when it was flying) is more important than most of you would think. And for a different reason than most of you would guess.

Every so often I get to talk about my first job which was in the aerospace industry where I first learned about sound suppression systems. Today AFT software is used on several of these systems by our customers in the aerospace industry as well as NASA. 

The flowrate of water used in the sound suppression process is enormous. Which is why they are often called "deluge systems".

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Trey Walters

The Knowledge Quest: Connecting With Fluids Education at Universities

This week was not a typical week for me. For the first time in 30 years I found myself in not one, not two, but three university classrooms. Each classroom was in one of Colorado's excellent engineering schools.

I had a chance to come face-to-face with about 140 students in classrooms this week and several professors. A number of positive things came of the week which I will summarize below.

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