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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.

The Power of Global Editing

Global editing is a powerful feature that has existed in all AFT software since version 1.0. The Global Editing windows for pipes and junctions allow engineers to input or modify data for all or a select group of pipes and junctions in a model. This saves countless time when there are many modeling changes that need to be made.  Rather than making changes one by one, changes can be made once and applied to an unlimited number of pipes or junctions.

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Viewing Output Across Multiple Scenarios

AFT Arrow 4.0 and AFT Fathom 7.0 offer the ability to view text output across multiple scenarios simultaneously, greatly facilitating seeing the differences in results between scenarios. To view multiple scenario output, open Output Control either from the Analysis menu or, when the Output window is active, by clicking the toolbar button, and then selecting the Multi-Scenario tab. Under Display Type select Selected Scenarios and click the Select Scenarios button to open the Select Scenarios window. Select the scenarios you want to see output for and click OK to return to Output Control where the selected scenarios will now appear in...

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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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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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Check Out Our New Support Center!

We have begun to use a new support center to provide technical support!  The way our support center can be accessed is through the “Request Support” button from our website. Doing so will take you to the page where you can email us directly. In order to receive a faster response, be sure to include the company name and license number in the message. If you would like to attach multiple files, zip them up and attach the zip file. Finally, when clicking on the "Home" button while in the AFT Support Center, you will be able to access multitudes of...

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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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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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