Velocity representation at exit

hamed.majeed · October 19, 2018, 13:16

I have three ways to represent velocity (left to right in image below):

1. Velocity contours nodal values at outlet.
2. Velocity vectors at outlet.
3. Velocity contours (nodal values are unchecked) at outlet.

Q1. Which is the right way to represent the velocity?
Q2. Why is velocity for 1st case (velocity contours nodal values) zero?

LuckyTran · October 19, 2018, 15:06

Node values are values at the vertexes. If you don't check node values, then you are looking at face values.

By any chance do you only have 1 cell across your annulus? Then all your vertices are on walls and it makes sense your node values are 0 everywhere because of no-slip.

October 19, 2018, 13:16	Velocity representation at exit	#1
hamed.majeed Senior Member Hamed Abdul Majeed Join Date: May 2012 Location: New Orleans, LA, US Posts: 147 Rep Power: 13	I have three ways to represent velocity (left to right in image below): 1. Velocity contours nodal values at outlet. 2. Velocity vectors at outlet. 3. Velocity contours (nodal values are unchecked) at outlet. Q1. Which is the right way to represent the velocity? Q2. Why is velocity for 1st case (velocity contours nodal values) zero?

October 19, 2018, 15:06		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,668 Rep Power: 65	Node values are values at the vertexes. If you don't check node values, then you are looking at face values. By any chance do you only have 1 cell across your annulus? Then all your vertices are on walls and it makes sense your node values are 0 everywhere because of no-slip. hamed.majeed likes this.

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