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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

Model Pump Curve Families With Multiple Pump Configurations

You've probably modeled pumps using curve data from the manufacturer. In conjunction with specifying a name reflecting the pump make and model and saving pumps to your component database, selecting and using these pump junctions in your system models is fast and easy. Often, however, a make/model pump will have not one set of head/pressure, efficiency and NPSHR curves, but a family of curves for various operating speeds and impeller diameters. You could define a pump junction for each set of curves, but with Multiple Pump Configurations, you can readily save the entire family of curves in one pump junction. For...
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Applied Flow Technology

Quickly Find Undefined Objects in a Large Model

AFT software identifies which pipes and junctions lack complete input information by displaying the tag of undefined objects in red (this function may be toggled on and off by clicking the 'Object Status' button on the toolbar - the one on the far right that looks like a floodlamp). At normal zoom factors this makes it apparent which objects are undefined. When you zoom out to view a large system, however, it can be difficult to see which object tags are red. This is where the Find window's 'Show Undefined' function comes in handy. Open the Find window either from the...
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Applied Flow Technology

Resources to Validate AFT Software

Users regularly contact us asking for information to assist them in validating AFT software. The formality of the validation requirement ranges from customer's self imposed internal requirements to rigorous validation as required for work in the nuclear industry. Fortunately, AFT provides extensive reference material for validation and, what's more, you probably already have it since it's automatically installed when you install AFT Arrow, AFT Fathom, AFT Impulse or AFT Mercury. Under the main application folder you'll find the Verification folder, containing models developed from published references. The source of the reference problem is displayed in the General section of the Output...
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Applied Flow Technology

Exporting Data to a Spreadsheet

While AFT piping system modeling software provides a large number of available output parameters, there may be times when you need to do some post calculations from the available results to derive a particular parameter. This is greatly facilitated by being able to bring output data into a spreadsheet. Two methods are available to accomplish this. The first is to simply click the output cell, or drag the cursor over multiple output cells, press 'ctl+c' to copy the data to the Windows clipboard, then switch to your spreadsheet application and past the data in the desired location. Alternatively, while in the...
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Applied Flow Technology

Modeling Effects of System Wear

AFT modeling software offers a variety of ways to analyze the effects of wear and aging on a piping system. Model increased effective wall roughness due to scaling or corrosion by specifying a corresponding roughness factor. You can do this directly within the Pipe Specifications window by selecting 'Unspecified' in the 'Friction Model Data Set' area of the 'Pipe Model' tab then entering the specific roughness value to be used. Alternatively, you may set up alternate 'friction data sets' within the Pipe Material Database with descriptive names (e.g. "10 year old pipe") and then simply select them within the Pipe Specifications...
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Applied Flow Technology

Preferred Solution Method to Use for Optimization

Whenever possible, use the Lumped Adiabatic solution method when performing optimization because it is much faster. Final optimization runs can be performed with the default marching method.
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Applied Flow Technology

Morphing Junctions

If you hold down the CTRL key while you drag a junction onto the Workspace and drop onto an existing Workspace junction, the old junction will 'morph' (change) into the new one. Pipes will be connected to the new junction and related data will be copied into the new junction.
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