# 5MW FOWT linearization issue

**URL:** <https://forums.nlr.gov/t/5mw-fowt-linearization-issue/1494>\
**Category:** General\
**Created:** [November 14, 2016, 1:44pm UTC](https://forums.nlr.gov/t/5mw-fowt-linearization-issue/1494 "2016-11-14T13:44:54Z")\
**Posts on this page:** 1\
**Showing post:** 51

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**Author:** ![Amr.Hegazy](https://avatars.discourse-cdn.com/v4/letter/a/57b2e6/32.png) [@Amr.Hegazy](https://forums.nlr.gov/u/Amr.Hegazy)\
**Post date:** [August 2, 2022, 1:39pm UTC](https://forums.nlr.gov/t/5mw-fowt-linearization-issue/1494/51 "2022-08-02T13:39:10Z")

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Dear Dr. @Jason.Jonkman

- I am using OpenFAST v3.0. Whenever I try to linearize with ExctnMod, RdtnMod = 2, the simulation stops and does not continue as shown in the first image. If I set ExctnMod, RdtnMod = 0, the simulation works fine and I get \*.lin files, but that does not make sense for a floating turbine since I will be neglecting hydrodynamic wave excitation and radiation in such situation. Then, I used v2.6. to perform the same simulation with ExctnMod, RdtnMod = 2, and it works as shown in the second image. Do you know what might be the reason?

 ![image](https://europe1.discourse-cdn.com/nrel/original/2X/1/10755ce28f4582b420b1d143666e72919ce76106.png)

 ![image](https://europe1.discourse-cdn.com/nrel/original/2X/7/76f55e9e621aeca7d43308014e6f01b6f9d59753.png)

- I was also wondering if the issue reported here ( [Obtaining sensitivity of aerodynamic power to rotor-collective blade pitch - Wind & Water / Controls - NREL Forum](https://forums.nlr.gov/t/obtaining-sensitivity-of-aerodynamic-power-to-rotor-collective-blade-pitch/2427/8)) would have any effect on the linear models obtained from v3.0? Do you recommend using v2.6 or upgrading to the latest version?

Thanks for your help!

Best regards,

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