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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.
Trey Walters

New Prices for Next Generation of AFT Software Products

We have been hard at work for the last several years on the next generation of AFT software products. These new versions will extend AFT's leadership in the global marketplace and offer engineers unprecedented modeling and user interface capabilities.

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Recent Comments
Guest — Geoffrey Stone
There is no way I can take account of the corporate discounting as I am a one man band that services many corporate clients. Some ... Read More
Saturday, 30 June 2012 00:04
Guest — AFT Fathom 8…Worth the Wait | Applied Flow Technology Blog
[...] was announced in May, 2012 to all newletter subscribers and everyone on the AFT Fathom notification list, as well as on the ... Read More
Friday, 31 August 2012 20:14
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Trey Walters

The Future of Engineering - Part 1

May and June are the time for graduations in the USA. My third son graduated from high school this month and will be pursuing a major in Aerospace Engineering. My oldest son is finishing his third year in Mining Engineering and my second son has started into a Mechanical Engineering major. Engineering education and the future of engineering is a frequent discussion topic around our home.

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Recent Comments
Guest — mohsen mousavi
Hello Mr. Walters, Nice article. At first, Engineers need to learn life, need to know their world, need to know their God (of cou... Read More
Wednesday, 30 May 2012 06:16
Guest — The Future of Engineering – Part 2 | Applied Flow Technology Blog
[...] This article is the second in a two-part series on the future of engineering. Part 1 was discussed last month here. [...]... Read More
Friday, 29 June 2012 14:20
Guest — gautam Wayse
Dear Mr. Walter It really nice article worth reading ... Regards Gautam Wayse
Saturday, 30 June 2012 08:21
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  4 Comments
Ben Keiser

Sonic Choking: Flow Areas vs. Sonic Areas

AFT Arrow can be used to model various types of choking such as restriction choking, endpoint choking, and expansion choking.  A useful parameter in AFT Arrow’s output is the “Sonic Flow Area” and this is the flow area in which sonic choking will occur.  Comparing the sonic flow area to the actual flow area can help determine the margin between not choking and choking. The figure below provides a conceptual understanding of comparing various sonic areas to the actual flow area of a compressible system.  If one defines their system such that the sonic area (ASonic,1) is less than the flow...
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Recent Comments
Guest — Bogdan
Ben, How do you obtain the CdA value (minimum possible flow area)?
Friday, 01 January 2016 00:27
Ben Keiser
Hi Bogdan, The CdA value is essentially an effective flow area and it can typically be somewhere between 90-95% of the orifice ar... Read More
Monday, 04 January 2016 17:26
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Trey Walters

Where Did the Name "Arrow" Come From?

A frequently asked question at our training seminars - usually during a break or over lunch - is how we came up with the name "Arrow". More completely, the product is named AFT Arrow™ and it is considered by many as the world's leading compressible pipe flow modeling software product.

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Applied Flow Technology

Automatic Renumbering

All of the pipe numbers in Fathom must be unique. When adding a pipe to a model, the new pipe number will be incremented based on the highest pipe number currently in the model. For example, you may only have 25 pipes on the workspace, but if the highest pipe number is 100, a new pipe will automatically be assigned number 101. After several iterations of deleting and adding new pipes, the numbering scheme may be reduced to chaos. AFT Fathom provides three tools to quickly and easily renumber pipes. They can be found in the Edit menu.   The Renumbering...
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Trey Walters

May the Force Be With You: Evaluating Unbalanced Forces Caused by Waterhammer

A common task among pipe stress engineers is to evaluate loads on pipe systems caused by waterhammer. Since AFT Impulse 4.0 was released our users have had the ability to calculate waterhammer-induced unbalanced forces for use in any pipe stress analysis application. In addition, our users can create specially formatted transfer files for direct use in CAESAR II and TRIFLEX. However, the process of calculating such forces in AFT Impulse and then applying them in pipe stress software is not as straightforward as it sounds. Our customers have asked for assistance in this process. I have teamed with AFT's distributor in Canada...
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Applied Flow Technology

Calculating Energy Costs

AFT Fathom and AFT Arrow have the option to include energy costs in the Output. To utilize this option, first open and fill out the “Cost Settings” window which can be opened from the Analysis dropdown menu. Next open the specification windows for the pumps that you would like to calculate energy usage for, and select the option to “Include Cost in Report” from the “Cost” tab. After running the model, you will be able to review the new cost data in the output.  The cost report is configurable in the Output Control window.      
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