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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.

## Use Control Valve Junctions to Size Valves and Orifice Plates

AFT Fathom can EASILY size valves AND orifice plates with a SINGLE Control Valve junction!  There is no need to perform strenuous hand calculations to determine a valve Cv or an orifice diameter.  Just specify the system boundary conditions, pipe input properties, and the desired flow rate (or pressure) and AFT Fathom will calculate the Cv, K factor, and equivalent orifice diameter/area for you all at once! Figure 1 illustrates a control valve junction at the location of a valve or an orifice plate.  For known flow, use a Flow Control Valve (FCV).  For known upstream pressure, use a Pressure Sustaining...
To control flow, Can we place control valve before orifice plate ?
Thursday, 24 November 2016 14:16
Friday, 25 November 2016 03:11
Hi I can not find the equal orifice plate in fathom 10?
Tuesday, 27 November 2018 13:37
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## Who Cares About the Surge in "Funny" Fluids?

Well, it turns out lots of people. My first experience with "funny fluids" was in graduate school. One of my fluids professors had recently completed his doctoral thesis on funny fluids also known as non-Newtonian fluids. I got to see some of his graduate students do some crazy experiments with polymer additives to otherwise boring Newtonian fluids.

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## Exhaustive Tolerance Criteria

AFT Arrow uses Newton iteration to find a simultaneous solution for all junction pressures. Well, maybe not all junctions. When “Use Exhaustive Tolerance Criteria” is NOT selected, AFT Arrow will only check junction pressures that find their way into the solution matrix. The AFT Arrow solver builds a matrix of equations based on the number of flow splits in the model. Each flow split must have a common pressure that is consistent with the flow and pressure drop in all of the connected pipes. Finding the right pressure for each flow split can become rather tricky. To find the pressure using...
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## Coming Soon To a Computer Screen Near You: AFT Impulse 5 - Act Now To Get New Features at Old Prices

We are excited about all the new features coming in our AFT Impulse 5 waterhammer and surge modeling software. We plan to release this much anticipated new version before the end of the year.

hi I try to run a model in Slurry form but I have this error: "flow rate did not converge" what can I do?... Read More
Monday, 01 June 2015 07:26
Please send you tech support questions to support@aft.com. This is not a support forum. Thanks.
Monday, 01 June 2015 15:37
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## Using Duplicate Special to Easily Model Different Cases of an Single System

With AFT products, the Scenario Manager is an incredibly powerful feature that allows one to model several different cases in only one model file.  This includes different operating conditions, multiple pump configurations, different piping, system expansions, etc.  The list of different cases to model is essentially endless! Now, what if you have a single system and you would like to quickly model several cases where perhaps only a few parameters are changing?  You can start by building a single system on the Workspace.  Then you can use the “Duplicate Special” feature in the Edit menu to duplicate the entire system and...
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## What makes AFT tick?

Recently Steve Ballmer announced that he would step down as CEO of Microsoft sometime in the next 12 months. He has had mixed success with both fans and critics over the past 13 years. We depend on Microsoft Windows and development platforms for our business here at Applied Flow Technology. This led me to think about our company, its evolution and direction. Trey Walters has guided the growth of AFT from its inception as company run from his basement to a recognized leader around the world for delivering high-quality applications, technical support and consulting services in the area of flow analysis....
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## Modeling Area Changes As Additional Pipe Fittings

If you have a system where there are several area changes throughout the piping, modeling every single area change and connecting pipe can become taxing and time consuming.  Also, the more pipes and junctions that are in a model, the higher the complexity. With AFT software, it is very simple to include the area change losses in the pipes themselves! As seen in the Pipe Fittings and Losses screen shot below, there are four area change types that can be used and either abrupt or conical shapes can be modeled.  The key to determining which expansion or contraction type to use...