Face normal vector at the boundary

traens · March 14, 2016, 06:25

Dear all,

I am trying to implement a new contact angle model in a cylindrical sloshing tank.
Therefore, I introduce the x-component at the boundary as a kind of damping factor on my curved boundary. Meaning, boundary cells with a normal vector perpendicular to the x-axis should have a x-component of 0, cells with a normal vector parallel to the x-axis have a x-component, and so on.

I try to get the x-component as following:

Code:

scalarField normal_x=patch().Sf().component(0)/patch().magSf();

Compiling works, running the simulations also. But obviously in the results there is no difference at boundary regarding the x-direction.

Does anyone know different ways how to get the face normal vector?

Thank you!

Bloerb · March 14, 2016, 13:27

http://openfoam.com/documentation/cp...ml/a00930.html

patch().nf () const - Return face normals.
patch().Sf () const - Return face area vectors.

BSengupta · October 21, 2019, 22:11

Hi!

When I am writing the above code I am receiving error:
"
‘patch’ was not declared in this scope

"
Can anyone help me to understand the reason for this error.

yukuns · July 12, 2020, 16:18

Hello, have you resolved this issue? I ran into the same problem.

March 14, 2016, 06:25	Face normal vector at the boundary	#1
traens New Member Maximilian Transinger Join Date: Nov 2015 Posts: 2 Rep Power: 0	Dear all, I am trying to implement a new contact angle model in a cylindrical sloshing tank. Therefore, I introduce the x-component at the boundary as a kind of damping factor on my curved boundary. Meaning, boundary cells with a normal vector perpendicular to the x-axis should have a x-component of 0, cells with a normal vector parallel to the x-axis have a x-component, and so on. I try to get the x-component as following: Code: scalarField normal_x=patch().Sf().component(0)/patch().magSf(); Compiling works, running the simulations also. But obviously in the results there is no difference at boundary regarding the x-direction. Does anyone know different ways how to get the face normal vector? Thank you!

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March 14, 2016, 13:27		#2
Bloerb Senior Member Join Date: Sep 2013 Posts: 353 Rep Power: 21	http://openfoam.com/documentation/cp...ml/a00930.html patch().nf () const - Return face normals. patch().Sf () const - Return face area vectors.

October 21, 2019, 22:11		#3
BSengupta Member Bidesh Sengupta Join Date: Sep 2018 Location: Sngapore Posts: 76 Rep Power: 8	Hi! When I am writing the above code I am receiving error: " ‘patch’ was not declared in this scope " Can anyone help me to understand the reason for this error.

July 12, 2020, 16:18		#4
yukuns New Member Brian Join Date: Feb 2020 Posts: 4 Rep Power: 6	Hello, have you resolved this issue? I ran into the same problem.