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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.
Applied Flow Technology

Using Groups

Groups of pipes and junction can be named for later recall. This is done using the Group Tools on the Edit menu. Groups may have subgroups, and pipes and junctions may be members of multiple groups. To create a group select the pipes and junctions you want in the group, then select Edit/Groups...Create. Specify a name for the group, click OK and the Group Manager will be displayed showing the pipes and junctions in the group. Group Manager can also be used to add or remove pipes and junctions from an existing group, rename a group or delete a group. After...
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Trey Walters

When Pipe Flow Modeling Is Not Enough

Within the world of pumping system specialists there is a wide range of areas of domain expertise. I was reminded of this earlier this month while attending the AFT Calgary User Group meeting sponsored by AFT's Canadian channel partner. One of the invited speakers, Jordan Grose of Beta Machinery, used several areas of domain expertise to solve a waterhammer problem in the field. I will discuss more about Mr. Grose's presentation later in this article.

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Trey Walters

Why Gases Are More Complicated Than Liquids: And How the New AFT Arrow 5 Can Help

Several generations of engineers ago engineers realized that performing calculations on gas flow is a lot more difficult than for liquids. As a result, the bulk of what is gas flow engineering history has revolved around how to treat gases as liquids. Another large portion of history is how to simplify gas flow equations down to simple isothermal relationships. In other words, the majority of gas flow engineering historically is about how to take short cuts with gas flow calculations.

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Recent comment in this post
Guest — P.M. MARCELJOS
Flow of Liquid can be cotroled if it has more resistance but the air have less resistance but more diffcult to control the FLOW... Read More
Tuesday, 09 December 2014 06:13
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Ben Keiser

Making Use of the Quick Access Panel

With the release of AFT Fathom 8 and AFT Impulse 5, there is an incredibly useful new feature available on the Workspace called the "Quick Access Panel".  This feature allows you to quickly and easily work with several useful features of the software in one area such as the Scenario Manager, Pipe and Junction Inspection, Workspace Overview Map, the Checklist, and ability to activate the add-on modules. Scenario Manager Access to the full Scenario Manager capabilities exists in the Quick Access Panel.  Add new scenarios, clone scenarios, promote scenarios, re-order scenarios, add notes for scenarios, etc. Properties The Properties tab in...
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Ben Keiser

Estimating Pump Inertia, Specific Speed, and Four Quadrant Data within AFT Impulse 5

An excellent new feature of AFT Impulse 5 is that it is possible to estimate the pump inertia, specific speed, and four quadrant data sets directly within AFT Impulse 5!  No more need to perform external spreadsheet calculations for these estimates. In addition to that, AFT Impulse 5 can use the entered pump and power/efficiency curve to perform these estimates which makes things much easier and efficient!! First step is to enter pump curve data and generate the curve fits as shown in Figure 1. Figure 1:  Pump Performance Curve from Entered Data   Next, click on the "Transient" tab of...
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Recent Comments
Guest — Horacio Astete
this calculation works for Displacements positive pumps inertia too?
Monday, 11 May 2015 19:29
Ben Keiser
Hi Horacio, the pump inertia estimations in AFT Impulse 5 are specifically for centrifugal pumps and are not applicable to positiv... Read More
Tuesday, 12 May 2015 16:02
Guest — Jean
Thanks
Friday, 08 January 2016 14:41
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John Rockey

Benefits of the Discrete Gas Cavity Model

AFT Impulse 5 now includes a second cavitation model option: The Discrete Gas cavity Model (DGCM). So, what is it and how is it different from the existing cavitation model? This article will provide a very high level overview. The method of characteristics (the finite difference basis for 1D transient flow modeling) assumes a constant wave speed for each pipe, from time step to time step. There are, however, many things that would cause a change in wave speed; cavitation being one the most significant. A change in wave speed will have a dramatic effect on the pressure spike that occurs...
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Recent Comments
Guest — aqeel
what is actually meaning of this statement ***CRITICAL WARNING*** The following pipes have vapor volumes in computing stations gr... Read More
Tuesday, 15 August 2017 09:49
John Rockey
Hi Aqeel, AFT Impulse allows vapor cavity sizes to grow and shrink as is dictated by the system hydraulics, meaning that there is ... Read More
Thursday, 17 August 2017 16:41
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Trey Walters

The Two P's: Why You Should Care That AFT is Celebrating Its 20th Year

There are two good reasons you should care that Applied Flow Technology is celebrating it's 20th anniversary this year.

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