# FAST

**URL:** <https://forums.nlr.gov/t/fast/348>\
**Category:** Computer-Aided Engineering Software Tools\
**Created:** [April 6, 2011, 1:42pm UTC](https://forums.nlr.gov/t/fast/348 "2011-04-06T13:42:29Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![Jason.Jonkman](https://dub1.discourse-cdn.com/nrel/user_avatar/forums.nlr.gov/jason.jonkman/32/3086_2.png) [@Jason.Jonkman](https://forums.nlr.gov/u/Jason.Jonkman)\
**Post date:** [January 28, 2013, 2:06pm UTC](https://forums.nlr.gov/t/fast/348/5 "2013-01-28T14:06:21Z")

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Dear Anuj Gupta,

For information on the FAST theory basis, see the forum topic found here, especially my post from December 15, 2010: [Coupled blade modes in FAST](http://forums.nlr.gov/t/coupled-blade-modes-in-fast/314/1). To answer your direct questions:

\*FAST is based on combined modal and multi-body dynamics formulation with nonlinear beam elements.  
\*FAST’s aerodynamics module (AeroDyn) is based on a blade-element/momentum (BEM) or generalized dynamic wake (BEM) wake model, together with a Beddoes-Leishman dynamic stall model.  
\*The direct wind load on the tower is not currently included, but it is something we are working to add.

Best regards,

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