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Applied Flow Technology

Modeling Component Resistance Curves

A variety of resistance modeling methods are available within AFT software, including constant or variable K values for a wide variety of components, K or Cv for valves. Also, for most components, you may directly model a resistance curve. This is especially handy when you pressure drop (or head loss) vs. flow data from the component manufacturer or test data. Whether you're modeling a valve, spray discharge, orifice or general component junction, you'll find this option on the Loss Model tab of the junction specification window listed as "Resistance Curve". Clicking the button will highlight an 'Enter Curve Data' button, which...
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Applied Flow Technology

Backup Files

Every once in a while users will ask 'what are those .001 files created in my model folders?'. Answer - These are backup files of your model. When the model is saved the previous version is saved with the same name and the extension .001. This file can be opened or renamed if desired. By default one level of backup file is created and saved, but you can specify up to 10 levels of backup files in Options / General Preferences / User Environment tab. While there, you'll also see the option to have backups created automatically on a time frequency...
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Applied Flow Technology

Add Custom Pipe Data to Your Database

Another common example would be large diameter fabricated steel pipe made from rolled plate.Nominal sizes, diameters and wall thicknesses are custom, but the thermophysical properties (density, thermal conductivity) can still use the built-in values for steel, so that you want to add these sizes and wall thicknesses to the Steel category of material. Simply select Steel then click on the New Size button. The window that appears will let you specify a nominal size, diameters and wall thickness. If you wanted to create various wall thicknesses for this custom size pipe, you would select the Size then click the New Type...
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Use Bookmarks to Accelerate Model Navigation

AFT software has a variety of features for editing and navigating around models. One of these is the ability to define and then easily jump to bookmarks. So, what are bookmarks? A bookmark is an identified location, a junction or pipe, within a model. To create a bookmark, select a junction or pipe by clicking it once. On the View menu, select Bookmarks\Set Bookmark. To jump to the bookmark, simply press F9 and the Workspace will pan to bring the junction or pipe into view and select it. Any number of bookmarks may be defined. When multiple bookmarks are set, pressing...
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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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