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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

What Does “Head (HGL)” Mean for Submerged Pumps and Exit Pressures?

In AFT Fathom and AFT Impulse, it is possible to model a submerged pump where a short and possibly frictionless suction pipe for the pump’s inlet does not need to be modeled.  When modeling a submerged pump, there are two options available for specifying the system inlet boundary condition at the pump suction.  As shown in Figure 1 below, the Submerged Pump’s Suction Pressure can either be specified as “Head (HGL)” or “Pressure”.   Modeling a submerged pump is not the only time where the “Head (HGL)” or “Pressure” choices will arise.  If an Exit Valve (i.e., a valve that discharges...
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Ben Keiser

When Should You Use Variable Pipe Resistance?

Have you ever finished running an AFT Impulse model and then received the following Warning message shown in Figure 1 and then wondered what it means? During a waterhammer analysis, the flowrates are constantly changing all throughout the system, therefore, the velocities and Reynold's numbers are also constantly changing.  The friction factors will also be constantly changing during the transient.  By default, AFT Impulse will use the friction factors that are obtained during the steady-state analysis and then use the same friction factors during the transient and they will be assumed to remain constant. Since it is possible for the flowrates...
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Ben Keiser

Name That Fluid - Databases 201

AFT Software offers lots of different fluid modeling options of common fluids with the AFT Standard Fluids that are available in AFT Fathom, AFT Arrow, and AFT Impulse.  The AFT Standard Fluids can be accessed in the System Properties window and they provide fairly accurate thermophysical properties. But what happens when there is a fluid that you need to model and it does not exist as an AFT Standard Fluid in the software?  Well, there is no need to fret in this situation!  You can very easily create your own custom fluid and add it to the fluid database! The Fluid...
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Ben Keiser

Databases 101 - Get to Know Them

Amongst the vast multitude of superbly efficient features within AFT Software, the customization and Database capabilities are certainly of significant importance.  If you are not familiar with how to use the Databases within our software to manage your customized information, then getting familiar should be a top priority for what you learn how to do next in our software.  Making effective use of Databases will save you and your team of AFT users incredible amounts of time! The vast amounts of data that you can customize within our software includes: Components (junctions)Fluid propertiesPipe materialsPipe insulationFittings & Losses (that get lumped into...
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Ben Keiser

What Good is a Map Without Colors?

What Good is a Map Without Colors?
Each AFT software product employs five Primary Window tabs in which you would build, define, and analyze the model of your system.  Of these, the Visual Report window is incredibly useful in that you are able to overlay your model input or output parameters directly on top of the graphical layout of the system itself.  This is an excellent feature to use when you want to provide the bottom line results to clients and colleagues at a high level (or a detailed level).  Figure 1 is an example of what the Visual Report for a particular system might look like.  As...
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Ben Keiser

Goodbye Graph Sets! Hello New Graph List Manager!!

Goodbye Graph Sets!  Hello New Graph List Manager!!
AFT software products have had powerful graphing capabilities for a very long time.  Many types of graphs can be created with AFT products such as pump vs. system curves, profile plots along a flow path, gradelines and elevation profiles, transient plots (with AFT Impulse or the AFT Fathom XTS module), slurry system curves (with AFT Fathom SSL or AFT Impulse SSL modules), and selected solutions that allow you to plot various output parameters for desired pipes. All of these graphing capabilities are incredibly important to engineers as they analyze the hydraulic behavior of their system.  The ability to customize the graphs...
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Ben Keiser

Behold The New Design Alert Manager!

One of the newest features of AFT Fathom 9 that will add a lot more efficiency to analyzing your results is the new Design Alert Manager!  In addition to the new Design Alert Manager, it is also possible to add general Design Alerts for junctions such as inlet or outlet pressure, or perhaps the pressure loss across a junction. In previous versions of our software, it would be possible to create different Design Alerts for pipes where you could specify a minimum or maximum value for a particular output parameter such as a maximum pressure limit, minimum flow rate, maximum velocity,...
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