# Wind Veer Parameter

**URL:** <https://forums.nlr.gov/t/wind-veer-parameter/2103>\
**Category:** Inflow Turbulence\
**Created:** [August 7, 2019, 10:31pm UTC](https://forums.nlr.gov/t/wind-veer-parameter/2103 "2019-08-07T22:31:50Z")\
**Posts on this page:** 1\
**Showing post:** 55

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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:** [September 1, 2022, 3:27pm UTC](https://forums.nlr.gov/t/wind-veer-parameter/2103/55 "2022-09-01T15:27:06Z")

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Dear @Andre.White,

Here are my responses:

1. Regardless of the load case, you can always set `PtrmYIner` to represent the otherwise unconsidered rotational inertia of the undeflected tower about its centerline. But it is necessary to set `PtfmYIner` nonzero when `PtfmYDOF` = `YawDOF` = TRUE.
2. I’m not sure which “error” you are referring to. But I would not expect that you would set `YawDOF` or `PtfmYDOF` differently for cases with and without yaw misalignment.
3. When `YawDOF` = True, I would always recommend setting `YawNeut` = `NacYaw` unless you are purposely trying model a case where the nacelle-yaw snaps back to its neutral state.
4. See 3. This applies for cases with and without yaw misalignment.

Best regards,

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