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AFT Blog

Welcome to the Applied Flow Technology Blog.
Trey Walters

Cloudy With a Chance of Herd Immunity

COVID-19 has impacted us all in some way or another. This has forced most all of us to change how we do things – including our jobs. More than ever before, we have needed the Cloud. Despite my best efforts to avoid it, I caught the COVID-19 virus in late November. I was working from home at the time, as were most of the AFT staff. The Cloud enabled...
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Ben Keiser

Know Your Pump & System Curves - Part 3

In the final "Know Your Pump & System Curves" blog series, I am going to discuss the complexities behind pump vs. system curves for systems with pumps in series and parallel configurations. Multiple pumps in series configurations are relatively straight-forward and will be discussed briefly. Operating pumps in parallel configuration involve a f...
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Trey Walters

Digital Twin – Identical or Fraternal?

When I was a child, I was jealous of twins. I thought how cool it would be to have a twin. I had twin cousins a few years older than I was that I saw on a frequent basis. I always got them confused. Which one was Roger, and which one was Ronny? A buzzword floating around recently is "digital twin". Sounds cool. What is it? According to a webinar by...
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Ben Keiser

Know Your Pump & System Curves – Part 2B

In this blog, we dive further into pump and system curves for complex systems.  The examples include demonstrating system curves changing over time and when multiple system curves exist for a single system with multiple pumps in different locations of the system.  Let us re-visit the multi-branched system example from the previo...
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Trey Walters

Pump Geeks from a Century Ago - von Kármán and Knapp

Flow going backwards through a pump? Then the pump starts rotating in reverse? Where the heck is the check valve to stop the flow? These are all great questions (which I will answer later in this article). Theodore von Kármán and Robert Knapp were working on these questions in the early 1930's. Most engineering students encounter von Kármán in thei...
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Trey Walters

AFT Arrow is 25 Years Old…and Still Going Strong

As the original developer of AFT Arrow, I consider it as one of my babies. This month it is all grown up and now 25 years old. Back in March we came out with the latest new version AFT Arrow 8 – just as the COVID-19 crisis was emerging. Those who have taken an AFT Arrow seminar which I have taught (at least fifty classes and counting!) have likely ...
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Stephanie Villars

Modeling Fans, Blowers and Compressors - Oh My!

For gas systems flow is driven either by a pressure difference, or by a turbomachine. AFT Arrow allows users to model turbomachines such as fans, blowers and compressors. For this blog we'll talk about what differentiates these three options, and how to model them using AFT Arrow.    Definitions and Types Fans, blowers and compressors all...
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