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AFT Blog

Welcome to the Applied Flow Technology Blog where you will find the latest news and training on how to use AFT Fathom, AFT Arrow, AFT IMpulse, AFT xStream and other AFT software products.
Ben Keiser

Modeling Area Changes As Additional Pipe Fittings

If you have a system where there are several area changes throughout the piping, modeling every single area change and connecting pipe can become taxing and time consuming.  Also, the more pipes and junctions that are in a model, the higher the complexity. With AFT software, it is very simple to include the area change losses in the pipes themselves! As seen in the Pipe Fittings and Losses screen shot below, there are four area change types that can be used and either abrupt or conical shapes can be modeled.  The key to determining which expansion or contraction type to use...
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Recent Comments
Guest — allen
Hi Ben, I know I'm late for comments but nevertherless...:-) About area changes: if I model a reducer as specific junction (big pi... Read More
Thursday, 06 August 2015 12:07
Ben Keiser
Hi Allen, no worries at all, questions welcome any time! Anyway, that is a very good point that you have brought up. If you mode... Read More
Thursday, 06 August 2015 15:04
Guest — Jens
Hi Ben, a very late question to your comment. When using rectangular ducting the area change function is not working in automatic ... Read More
Tuesday, 28 August 2018 11:17
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Trey Walters

Rockets are Pumping Systems Too - The Aerospace Heritage of AFT

Many of our customers find it interesting that the foundational code developers at AFT are former rocket engineers. Jeff Olsen and I wrote the bulk of AFT Fathom™, AFT Arrow™, AFT Impulse™, AFT Mercury™ and AFT Titan™ from 1993-2003. Jeff is currently AFT's Vice President of Technology. We both hold B.S. and M.S. degrees in Mechanical Engineering.

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Applied Flow Technology

Modeling a submerged pump in AFT Impulse

In AFT Impulse you can directly model a submerged pump. First, you will define your pump data exactly as you would normally, however you will only draw the discharge piping and not a suction piping. After doing this, you will check the box “Submerged Pump” at the bottom of the Pump Specifications Window. You now have an additional required input field. The “Suction Pressure” can be entered as a Head (HGL) or a Pressure. When entered as a Head (HGL) value, this value is the actual liquid elevation in the supply reservoir. When entered as a pressure, this is the actual...
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Trey Walters

Should Engineers Always Perform Waterhammer Analysis of New Pipe Systems?

The question of whether waterhammer analysis on new pipe systems is optional or required does not have a definite answer. In some cases it is clear - such as when the pipe system is being designed in compliance with ASME code (see How AFT Impulse Can Help Engineers Comply With ASME Codes). But in many cases it is up to experience and judgment whether or not to perform waterhammer analysis.

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Trey Walters

World Languages and Waterhammer

The demand for our AFT Impulse waterhammer modeling software and associated training seminars has been growing steeply in recent years. I frequently travel internationally to teach  seminars on waterhammer. When I do I make it a point to find out what the engineer's local language calls waterhammer.

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Recent comment in this post
Guest — Eddie Bosman
The Afrikaans word for waterhammer is "waterslag" (Afrikaans is one of the many languages in South Africa).
Wednesday, 28 November 2012 15:28
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John Rockey

Jumping Specification Windows

In the process of making specification changes to a sequence of pipes or junctions, one may find it easier to jump from one pipe (or junction) to the next without closing the current specifications window. This can be accomplished by clicking the “Jump” button in the specifications window. Clicking the Jump button will open a dialog where the next pipe or junction number can be selected. Once the selection is made, clicking on the jump button will advance the existing specifications window to the selected pipe or junction number. To make things even faster, pressing F5 within an active specifications window...
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Applied Flow Technology

Graph Sets

In all of our core products (Fathom, Arrow, Impulse, Mercury, Titan), we offer the ability to save graph sets. This has the potential to save a lot of time when reviewing multiple graphs of different parameters. In order to define a graph set, first construct and customize the graph you would like to review. Then open the “Select Graph Data” window from the View menu and click the button “Save Set As…”. After entering a graph set name, click ok, and you have just created a graph set! At this point you can modify any parameters in your model, re-run the...
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