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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.

Pipe Elevations at a Reservoir

Specifying a pipe connected to a reservoir using a pipe depth will keep the pipe at a constant elevation relative to a changing liquid elevation. For a constant absolute pipe elevation, specify the connected pipe using pipe elevation.

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Using Orthogonal Pipe Drawing in AFT Fathom 7.0

A new feature in AFT Fathom 7.0, orthogonal pipe drawing automatically inserts an intermediate vertex into a pipe and adjusts the length of the pipe segments to create a right angle graphical bend between the pipe end points. Orthogonal drawing can be turned on either from Options, Workspace Preferences Display Options tab, or quickly toggled on and off with the F4 key. By toggling orthogonal drawing on and off you can easily mix pipe drawing modes and even have drawing modes compliment each other. For example, with orthogonal drawing toggled off, select a pipe and insert a segment using AFT Fathom's...

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Using Zoom Select

The zoom select tool is a quick way to zoom into an area of interest. If you click the zoom select tool and draw your selection box the selected area will expand to fit the selection box. The drawn selection box will expand to fit your Workspace so that the magnification will will vary according to the size of the selection box and the area of the model selected. Alternatively you can always have zoom select zoom to 100% by clicking the zoom select tool then holding the shift key down while you draw the selection box and release the mouse...

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Using Animated Graphs in AFT Impulse

As will all AFT flow modeling software, AFT Impulse includes comprehensive graphing capabilities. Most users are familiar with the traditional time and profile graphs, the first graphing a selected parameter vs. time and the second vs. distance (along a selected flow path). Animated graph output provides a means to view both at the same time. To generate animated graphs all of the stations of the pipes in the flow path to be graphed must be saved. By default AFT Impulse saves the pipe inlet and outlet data to the output file. To change this go to Analysis / Transient Control. Increasing...

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Setting the Workspace Size

All of AFT's piping system modeling software allows the user to set the Workspace size from the View menu. The Workspace Size window graphically displays the size of the Workspace as blocks. When a new model file is created the size is initially set to 1 x 1. If you're model is bigger than this, you'll need a bigger Workspace size. Before changing the Workspace size it's worthwhile to remember how it relates to the model size. An analogy is a building and plot size, where the building is analogous to the model and plot size analogous to the Workspace size....

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Viewing the Output on the Workspace

You probably already know that you can quickly view a summary of the input data for any object in your model with the Inspection Window. Simply place the cursor over a pipe or junction and 'right click' your mouse ('left click' for you lefties). Think how handy it would be if you could also see a summary of output information on the Workspace. You can and it's as easily done as viewing the Inspection Window by holding the 'ctl' key down as you right click. P.S. - In case you didn't already know, holding the 'shift' key down while right clicking...

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Is This Valve Choked?

Under sub-sonic gas flow conditions, loss models can use the familiar K, Cv or resistance curve methods. At choked flow, however, the dynamics of compressible flow require a different method to characterize the loss, which AFT Arrow users will see as the optional 'CdA' input value on the valve and other junctions specifications window. The product of coefficient of discharge and effective flow area under choked conditions, AFT Arrow can directly calculate the CdA for some cases, such as at the discharge from a pipe. For other components, such as valves, determining these values is most commonly done through flow testing....

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