fluent slip wall boundary condition

sehs15 · December 30, 2014, 06:42

hello all , does slip wall boundary condition enforce all gradients to be zero in the normal direction (i.e equivalent to symmetry boundary) ?!

LuckyTran · December 30, 2014, 14:00

the wall boundary condition enforces wall-normal component of velocity is zero. The slip boundary condition enforces wall-normal gradient of wall-parallel velocity to be zero.

the wall-normal gradient of the wall-normal velocity is not enforced; neither is the wall-parallel gradient of the wall-normal velocity.

Gradients of other variables (non-velocity such as temperature, species, etc) are not enforced since they have nothing to do with slip condition.

Your question may need some clarifications since there are some technicalities to what is considered "all gradients"

sehs15 · January 1, 2015, 10:04

ok . i want to solve a 2D duct with the introduction of area variation with axial direction in the 3rd dimension .. so i constructed a variable area duct geometry with one cell depth in the 3rd dimension and upper and lower slip wall boundary conditions to mimic a 2D pipe flow

December 30, 2014, 06:42	fluent slip wall boundary condition	#1
sehs15 New Member mohamed mohsen Join Date: Oct 2012 Posts: 29 Rep Power: 13	hello all , does slip wall boundary condition enforce all gradients to be zero in the normal direction (i.e equivalent to symmetry boundary) ?!

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December 30, 2014, 14:00		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,674 Rep Power: 66	the wall boundary condition enforces wall-normal component of velocity is zero. The slip boundary condition enforces wall-normal gradient of wall-parallel velocity to be zero. the wall-normal gradient of the wall-normal velocity is not enforced; neither is the wall-parallel gradient of the wall-normal velocity. Gradients of other variables (non-velocity such as temperature, species, etc) are not enforced since they have nothing to do with slip condition. Your question may need some clarifications since there are some technicalities to what is considered "all gradients"

January 1, 2015, 10:04		#3
sehs15 New Member mohamed mohsen Join Date: Oct 2012 Posts: 29 Rep Power: 13	ok . i want to solve a 2D duct with the introduction of area variation with axial direction in the 3rd dimension .. so i constructed a variable area duct geometry with one cell depth in the 3rd dimension and upper and lower slip wall boundary conditions to mimic a 2D pipe flow