# Correct boundary condition settings for a turbulent wall resolved mesh

**URL:** <https://www.simscale.com/forum/t/correct-boundary-condition-settings-for-a-turbulent-wall-resolved-mesh/83507>\
**Category:** Project Support\
**Created:** [November 14, 2018, 7:38pm UTC](https://www.simscale.com/forum/t/correct-boundary-condition-settings-for-a-turbulent-wall-resolved-mesh/83507 "2018-11-14T19:38:45Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![e0625598](https://www.simscale.com/forum/letter_avatar/e0625598/32/5_5575768a8748004e209b776fc1b2916d.png) [@e0625598](https://www.simscale.com/forum/u/e0625598)\
**Post date:** [November 14, 2018, 7:38pm UTC](https://www.simscale.com/forum/t/correct-boundary-condition-settings-for-a-turbulent-wall-resolved-mesh/83507/1 "2018-11-14T19:38:45Z")

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Hello community,

i need some knowledge for a turbulent incompressible case.

turbulence modells:

- kEpsilon
- kOmega

Could any body write down the correct boundary condition for a turbulent wall resolved mesh.

patch wall:

- U: noSlip
- p: zeroGradient
- k: zeroGradient or fixedValue 0 ?
- omega?
- epsilon?
- nut = calculated?

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**Author:** ![jousefm](https://www.simscale.com/forum/user_avatar/www.simscale.com/jousefm/32/34908_2.png) [@jousefm](https://www.simscale.com/forum/u/jousefm)\
**Post date:** [November 14, 2018, 7:52pm UTC](https://www.simscale.com/forum/t/correct-boundary-condition-settings-for-a-turbulent-wall-resolved-mesh/83507/2 "2018-11-14T19:52:44Z")

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Hi @e0625598!

Please refer to this post: **[Defining Turbulent Boundary Conditions](https://www.simscale.com/forum/t/defining-turbulent-boundary-conditions/80895)**

Also the names you states for the “wall patch” you have to make a difference between the **patch** and the actual **wall** boundary condition:

- Patch: Generic type containing no geometric or topological information about the mesh (inlet, outlet, etc.)
- Wall: Rigid Wall (patch that coincides with a solid wall \rightarrow using wall functions)

* * *

The names are identical on the platform. What case are you trying to simulate? Did you already have a look at the **[Public Project](https://www.simscale.com/projects/)** section to look for a template?

Cheers,

Jousef

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**Author:** ![e0625598](https://www.simscale.com/forum/letter_avatar/e0625598/32/5_5575768a8748004e209b776fc1b2916d.png) [@e0625598](https://www.simscale.com/forum/u/e0625598)\
**Post date:** [November 14, 2018, 8:02pm UTC](https://www.simscale.com/forum/t/correct-boundary-condition-settings-for-a-turbulent-wall-resolved-mesh/83507/3 "2018-11-14T20:02:21Z")

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> [@jousefm](#):
>
> Defining Turbulent Boundary Conditions

Hello @jousefm,  
thanks you for your link, but i could not find the required information.

What setting the solver is using when _Full resolution_ on _wall_ boundary condition is selected.

what setting are set on the backend for:

- U
- p
- k
- nut
- omega (if kOmegaSST turbulence model is used)
- epsilon (if kEpsilon turbulence model is used)

Thank you in advance

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**Author:** ![jousefm](https://www.simscale.com/forum/user_avatar/www.simscale.com/jousefm/32/34908_2.png) [@jousefm](https://www.simscale.com/forum/u/jousefm)\
**Post date:** [November 14, 2018, 9:42pm UTC](https://www.simscale.com/forum/t/correct-boundary-condition-settings-for-a-turbulent-wall-resolved-mesh/83507/4 "2018-11-14T21:42:51Z")

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Hi @e0625598!

This post might help you out about yplus and wall functions in general: **[What is y+ (yplus)?](https://www.simscale.com/forum/t/what-is-y-yplus/82394)**

* * *

1. “Full boundary layer Resolution”

- yPlus around 1 (in the viscous sublayer)

- current setup: k = 0

- omega = omegaWallFunction

- nut = nutkWallFunction\*

* * *

1. “Wall function approach”

- 30 \< yPlus \< 300 (in the logarithmic sublayer)

- Current setup: k = kqRWallFunction

- omega = omegaWallFunction

- epsilon = epsilonWallFunction

- nut = nutkWallFunction

* * *

Does that help? For further information I would need to delve a bit deeper into it and see what I can find out.

Cheers,

Jousef

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**Author:** ![1318980](https://www.simscale.com/forum/user_avatar/www.simscale.com/1318980/32/9637_2.png) [@1318980](https://www.simscale.com/forum/u/1318980)\
**Post date:** [November 15, 2018, 8:43am UTC](https://www.simscale.com/forum/t/correct-boundary-condition-settings-for-a-turbulent-wall-resolved-mesh/83507/5 "2018-11-15T08:43:09Z")

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@e0625598 you can find the backend definitions by downloading the solved case file and reading the patch definitions for each variable in time 0.

Best,  
Darren