Dynamic solutions for a fluid world™

  • Home
  • Learning Center
  • Tips and Tricks

AFT Blog

Welcome to the Applied Flow Technology Blog.
Applied Flow Technology

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...
Continue reading
  1009 Hits
  0 Comments
Applied Flow Technology

Moving a Junction Without Moving the Pipe

Click on the junction to be moved once to select it. Then hold the Ctrl key down while you drag the junction icon and the pipes will remain in their current location. Note this results in the pipes being disconnected from the junction.
  988 Hits
  0 Comments
Applied Flow Technology

Building Multiple Models

While we usually think of building a system model in the Workspace (and, of course, we can have multiple models within a file in different scenarios), you can have multiple, disconnected system models within the work space simultaneously. This has many uses, including facilitating parametric modeling. For example, you're modeling a system with a defined supply flow and want to evaluate the results for various supply flow rates. After building the model, select the whole model (Edit/Select All or ctl+a), then duplicate it (Edit/Duplicate or ctl+d) as many times as desired. For each instance specify a different supply flow and, after...
Continue reading
  1051 Hits
  0 Comments
Ben Keiser

Problems With Heat Exchanger Specified Heat Rate In Constants?

Using “Specified Heat Rate In Constants” for the thermal model of heat exchangers can often cause problems in system models.  The reason why is because this thermal model type causes the heat exchanger to act like an “assigned heat input” junction as does an assigned flow junction does for providing constant flow rates.  Another problem is that this thermal model can cause unrealistic temperature changes across a heat exchanger.  When the heat rate is specified and the mass flow rate and heat capacity are calculated based on the system solution, the temperature change will be whatever is required to maintain the...
Continue reading
Recent Comments
Des Aubery
Very useful tip. Thank you. In many heat-exchangers, the relationship between heat-transfer & flow-rate would have a curve with c... Read More
Wednesday, 10 April 2013 09:37
  3754 Hits
  2 Comments
Applied Flow Technology

Integrating Component and Fitting Losses into a Single Pipe on the Workspace

Many components, such as isolation valves, elbows, and adjacent area changes, do not need to be modeled graphically when a simple k factor will suffice. In these cases, the AFT Fathom user can simplify and avoid unnecessary workspace clutter by integrating this data into a single pipe specification, using the Fittings & Losses tab. Fathom has a built library of component loss data provided by Miller, Crane, and Idelchik. The Fathom user can quickly and easily pick from a database of components, enter the quantity, and click OK. It is important to note, however, that Fathom uses the size of the...
Continue reading
Tags:
Recent Comments
Ray Cameron
Gerardo, thank you for your interest in our software. Free demo downloads are available by simply going to https://www.aft.com/dow... Read More
Wednesday, 08 February 2012 01:09
  3641 Hits
  2 Comments
Applied Flow Technology

Backup Files

All AFT Products automatically generate backup files each time you save your model. Backup files will be saved to the same location you have saved your model file to. They will have the exact file name as your model, but rather than having the extension *.fth, *.aro, *.imp, etc., they will have the extension *.001, *.002, *.003, etc. Every time you click save while working in your model, a new backup file will be created. If the maximum number of backup files already exists, the new backup file will overwrite the oldest backup file. The maximum number of backup files created...
Continue reading
  3402 Hits
  0 Comments
Ben Keiser

The Quickest Way to Learn AFT Products

After you receive your AFT software , you will probably wonder how to learn the software quickly so you can begin using it.  AFT provides a very handy Quick Start Guide for each software product in English Units and SI Units.  These quick start guides are short, concise, would take maybe a day of your time, and are extremely powerful to assist you in producing highly accurate and advanced models! With larger companies, sometimes the AFT software will go straight to the IT department for installation and the engineer may never see the hard copy of the quick start guides.  Not...
Continue reading
Recent Comments
Ben Keiser
Hi Max, No problem! You can email your model file to us at support@aft.com. Also, we have included several (about 76) different... Read More
Wednesday, 26 August 2015 19:37
  2818 Hits
  2 Comments