Dynamic solutions for a fluid world™


Welcome Rafael Hoyer

Applied Flow Technology would like to welcome Rafael Hoyer to our team of experts. Rafael will serve as an Applications Engineer with AFT’s Technical Support team as well as support AFT’s consulting service, Purple Mountain Technology Group.

Rafael comes to AFT from Caracas, Venezuela where he earned degrees in Mechanical Engineering (B.S.) from Central University of Venezuela; M.Eng. Project Management from Andres Bello Catholic University; and M.Eng. Designing of Piping Systems from Central University of Venezuela.

In his previous experience, Rafael served as a Project Engineer and an Operational Engineer. During his career, Rafael utilized AFT software to design fire protection systems, HVAC, and piping systems for refineries, and industrial complexes; as well as maintenance, inspection and mitigation planning of fixed equipment, such as atmospheric storage tanks, heat exchangers, boilers, pipes, etc… based on API, ASTM, ASME, AWS international standards.

Additionally, he was an Assistant Professor at Andres Bello Catholic University where he helped students develop an understanding of the principles related to thermodynamic laws as they pertain to properties, systems and thermodynamic processes.

Applied Flow Technology is proud to welcome Rafael, his wife (Alexandra) and his two children to the AFT family.

AFT Donates Software to Bright Engineering Minds at the University of Delaware

Engineering students at the University of Delaware's Department of Electrical and Computer Engineering have a vision and they used the power of AFT Fathom to investigate. 

In April 2018, Applied Flow Technology (AFT) donated AFT Fathom to Josh Dubey and Keith Goossen to investigate an energy efficient pump speed control algorithm for controlling sump level. AFT Fathom is fluid dynamic simulation software for engineers, used to calculate pressure drop and flow distribution in liquid and low velocity gas piping and ducting systems. AFT is honored to assist students who are working on research projects so we  donate full licenses to assist with their education.

As an industry leading modeling, simulation and analysis software, engineers around the world have continuously utilized AFT Fathom since 1996. The software models piping and ducting systems for hydraulic engineering projects ranging from expansion verification to troubleshooting production issues. It is a popular tool that can be found in any successful engineer's toolbox as it's known for it's ease of use and highly accurate results.

Engineers appreciate the intuitive interface and can confidently make sustainable models they can pass on to future project engineers. 

In their paper, Dubey and Goossen say, "In general, savings in pump energy can be achieved in two main ways. One is by designing more efficient pumps. Another, discussed and presented here, is improving pump performance with effective control strategies." In this paper, the duo reports a new control algorithm for sump pumping systems, for example in wastewater treatment plants, that results in up to 4 % savings compared to the currently used control algorithms.

Applied Flow Technology values young engineers' ingenuity and this dynamic duo is no exception. This project is ongoing and we look forward to seeing how these bright minds use AFT Fathom to contribute to future energy reduction. 


Paper Title: Investigation of an Energy Efficient Pump Speed Control Algorithm For Controlling Sump Level

Abstract: This paper explores a new nonlinear control algorithm for variable speed centrifugal pumps at water/wastewater pump stations that leads to specific energy savings over the conventional linear one. The algorithm is useful for facilities where pump speed is a linear function of liquid level in order to transport fluid and smooth inflow peaks. A non-linearity in the form of a quadratic term is added to the conventional linear one in order to produce efficiency gains, with a single parameter, curvature, varied to optimize energy savings. Results obtained by implementing the new algorithm on a pilot-scale pump station show significant energy savings for fixed pump flow, with a parabolic correlation of specific energy savings versus curvature of the nonlinear quadratic determined. In addition, the cost of implementing this algorithm is minimal to none, so the work presented has major industrial potential.


Read the full paper here

AFT Arrow 7 Now Available

AFT Arrow 7 has been released and it incorporates several new features Engineers and Managers have been asking for. If you engineer gas systems, AFT Arrow can help you work smarter. It's an awesome software tool that models, simulates, and analyzes pressure calculations and flow distribution in gas piping and/or ducting systems.

A few new features you might find interesting include:

  • Import piping layouts from CAESAR II® Neutral files
  • Import Piping Component Files(*.pcf) from SmartPlant®CADWorx®AutoCAD Plant 3D, and others.
  • EPANET import / export
  • Enhanced Excel integration including the new Excel Export Manager
  • Utilize 2D or isometric user interface
  • Clearer data entry for centrifugal compressor, reciprocating compressor and fans in the Compressor/Fan Property window
  • Updated Relief Valve specification with opening and closing profiles
  • Enhanced heat transfer including external convection coefficient calculation, buried pipe heat transfer, and heat tracing


Click HERE to view all of the new AFT Arrow 7 features.


Where did the name AFT Arrow Come From?

AFT Founder and President, Trey Walters, wrote a blog about the name a few years ago., It goes something like this:

When AFT Fathom was released in early 1994 we received many requests for a version which performed compressible flow modeling in pipe networks. When I started Applied Flow Technology in 1993 I knew AFT would develop a product for compressible pipe flow. So work on AFT Arrow began in 1994 soon after AFT Fathom 1.0 was released. However, he found out first hand what all fluid flow engineers already know - gas flow calculations are much harder than liquid flow. Especially in pipe networks.

But what should AFT's second software product be called?

I remember coming up with twenty different names to choose from. I can't remember hardly any of them but I do remember one of them being "Stratus". So AFT Arrow might have become AFT Stratus if I had made that rather misguided choice in 1995.

But then a moment of fate intervened.

I was working heavy hours in those days and my wife decided to take our young children to visit grandparents and I took them to the airport to send them on their way. On the way back home - AFT's office was in the basement of our home in those days - I was driving on the highway and passed an RV (a "recreatioanl vehicle" for international readers - it is like a mobile vacation home).

The brand name for the RV displayed in large letters on its back was "Arrow". And like an arrow which pierced me from out of the blue, I immediately realized AFT's second product would be called "AFT Arrow".

As challenging as it was to find a name for AFT Arrow, developing the product was even more challenging. I did not want to settle for a simplified ideal-gas, adiabatic-type of solution methodology to which other software companies have resorted. I wanted the whole thing - heat transfer, real gas modeling and fully capable sonically choked modeling capability. This took considerable effort and research, including the development of many highly innovative and proprietary solution techniques. In the end AFT Arrow was commercially released in October, 1995. Orders surged immediately because of the market awareness already created by AFT Fathom.

Today we are proud to offer AFT Arrow as the most accurate and capable compressible pipe flow software available on the market.


How can you learn more?

We have several options for you to try or inspect the capabilities of our software products including the product pages, features page, view an Introduction to AFT Arrow webinar, or even download a limited demo. The best of these options is a free evaluation license so you can see the full extent of this powerful software. Contact us at This email address is being protected from spambots. You need JavaScript enabled to view it. to request a license. 



Top 3 Features Engineers Love in AFT Arrow

It’s pretty hard to not love everything about AFT Arrow, Applied Flow Technology’s software that models, simulates, and analyzes any kind of gas that can be pumped through a piping system. The software can do anything from measure pressures to thermal analysis. We have been told it “saves a significant amount of man hours” on projects, and time and time again AFT Arrow continues to prove it’s worth around the world by matching data to help facilities expand and increase production.

Don’t take our word for it, you can check it out for yourself with a free demo (or even a full evaluation).


But in the meantime, here are the Top 3 features AFT Arrow users love about the software:

 #1 Don’t Choke - Identify Sonic Choking

High velocity gas systems can be very complex. The effects of compressibility must be accounted for when balancing mass, momentum, and energy. Additionally, there is another limit gas flow can run into – the speed of sound. The behavior of gas flow changes dramatically when Mach 1 is exceeded – pipe friction causes subsonic flow to speed up, but supersonic flow to slow down. This effect prevents subsonic flow from exceeding Mach 1 in a piping system, known as sonic choking.

Sonic choking is a very important effect to consider, as it effectively prevents an increase in flow for a certain upstream pressure. If more flow is required, this poses a problem in many systems. In some systems, sonic choking is used by design as a control feature. AFT Arrow includes the ability to detect and account for sonic choking with minimal user input – even at multiple consecutive locations.

This powerful ability allows an engineering to quickly identify potential issues in a system that may not be immediately obvious with more traditional methods.

#2 The sky’s the limit – Model Complex Networks with Dozens (or hundreds) of Pipes

It’s often difficult to analyze a system involving compressible flow and things become dramatically more complicated when there is branching and recombining flow. Mass, momentum, and energy must balance at every flow split – the effects of which impact the solution in the rest of the system. Every additional branch increases the complexity of a system … and how difficult it is to analyze.

Fortunately, AFT Arrow is available to help tackle this challenge! AFT Arrow allows the definition of an unlimited number of branching flow points and solves the entire system with fundamental compressible flow equations – not with estimations. An accurate solution is critical for complex systems. Rather than simplifying the system so it is easy to solve, use AFT Arrow to account for all the complexities!


# 3 Account for Real Gas Behavior

All mathematical models have certain limitations and simplifications. These are especially prevalent in the analysis of gas behavior. Perhaps the most well-known gas relationship is the Ideal Gas law. 

PV = nRT

This relationship greatly simplifies compressible analysis and works well in many applications. However, real gas behavior does vary from this model. The differences become more evident in more extreme cases with, for example, high temperatures, compressibility, or velocities. In these cases, it’s wise to use a more advanced Equation of State, such as Redlich-Kwong. However, while it’s one of the best methods to use, it’s clearly much more complex and difficult to apply.

But good news! AFT Arrow makes this application easy. The Redlich-Kwong method is the default in AFT Arrow, with the user also able to choose a constant compressibility, three-parameter, or ideal gas method as well. More accurate results are available with AFT Arrow more quickly than using a simplified model by hand.


Want to learn more about AFT Arrow? There are a few things you can check out:

  • View the website. Check out the Product Page to view a short video or even view the extended list of features
  • Watch the Introduction to AFT Arrow webinar or Download a Demo (note these demos are limited versions of the full software)
  • As always, AFT is happy to provide personal live demonstrations. Just give them a call at 719-686-100 or email This email address is being protected from spambots. You need JavaScript enabled to view it.

AFT Partners with Cortex Engineering Software of Australia

Cortex Engineering Solutions Logo

Applied Flow Technology (AFT) would like to welcome Cortex Engineering Software to their international family of Channel Partners.

While new to AFT, Cortex Engineering Software has been selling and supporting world’s-best engineering software for over thirty years. Based in Melbourne and Perth, Cortex prides themselves on their accumulated engineering experience and industry knowledge that allows them to add value to their clients’ businesses. 

Their extensive experience enables them to provide top rated and timely support to all clients. Their clients also appreciate Cortex’s ability to deliver educated and detailed advice on potential products.

In addition to AFT products, Cortex has been a Global Network Partner of Hexagon for their CADWorx and Analysis Solutions, has represented Paulin Research Group for over fifteen years, and sells and supports BricsCAD (a quality, low cost, AutoCAD alternative).

To speak with Cortex Engineering Software or for more information, call +61 3 98941233 or email This email address is being protected from spambots. You need JavaScript enabled to view it..

To view AFT's additional Channel Partners, visit: http://www.aft.com/channel-partners/channel-partner-locations