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.

Selecting English or SI Units

To choose only English or SI units for all parameters, select Parameter and Unit Preferences from the Options menu, then select the Unit Preferences tab, choose the Default Unit System and click the Apply Default Units button. This will use will the default units and change the preferred units.

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Keyboard Shortcuts

Selection Drawing Tool Double-clicking tool - Tool remains activeControl key - Tool remains active above +Shift key - Deselects pipes and junctionsAlt key - Toggles pipe and junction selection Pipe Drawing Tool Double-clicking tool - Tool remains activeControl key - Tool remains activeShift key - Draws horizontal or vertical pipes Zoom Select Tool Shift key - Zoom state will always be 100%. Dragging junctions from Toolbox Control key - Morphs junctionShift key - Splits pipe Inspecting pipes and junctions Right click + Shift key - Shows undefined itemsControl key - Shows Output dataAlt key - Shows optimized data (AFT Mercury only)Control...

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Highlight the Required Data Fields for Pipes or Junctions

The areas on the Specification Window which are required can be highlighted by either pressing the F2 key or by double-clicking on a blank area somewhere on the Specification Window.

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Quick Inspection of the Connected Pipes or Junctions While in a Specification Window

To check the properties of the objects connected to the one you are specifying, position the mouse pointer on the connected object's ID (listed in the specification window) and hold down the right mouse button.

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Quick Inspection of Pipe and Junction Properties

The inspection feature saves time by displaying the properties of a Workspace object in a read-only fashion. To inspect an object, position the mouse pointer on the object and hold down the right mouse button.

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Building Large Models - The Building Block Approach

Very large and complex models may be constructed by building smaller models and merging them together. It is a good idea to break the large system into logical parts where there are known boundary conditions (flowrates or pressures).

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Eliminating 'Negative' Flows

Flow direction arrows are for reference only, the actual direction being determined by the analysis and, if the direction is opposite the reference direction you've specified, values for flow, velocity and pressure drop will be negative. If you don't want negative values, simply select the pipe, press F3 to toggle the direction arrow and rerun your model. While this is fine for one or a few pipes, what if you have many pipes with negative flow values? Within the Workspace, open Select Special (on the Edit menu or by pressing F6). For 'Selection Type', select 'Pipe Output Properties', then 'Volumetric Flow...

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