Y+ Value Plotting in CFD Post

AS_Aero · May 28, 2017, 10:14

Hi

Is there any way that we can plot the y+ value along our geometry ? When I do a plane and take its contour for y+ in CFD post I can see the value from 0 to 25 but the contour remains grey plane. There its not showing where these values are. So I am not sure where is 25 where is around 0 !! So what is the possiblity ? Also I want to see the log law and z+ values. How can we do these ? Kindly let me know.
I did K-W model and for that y+ have to be less than 1
and for LES WALE model what is the y+ criteria ?

Светлана · May 28, 2017, 18:36

> When I do a plane and take its contour for y+ in CFD post I can see the value from 0 to 25 but the contour remains grey plane

In the tree view at the left, tick the box next to the contour. If this does not help please attach a screenshot.

To create new variables, use the expressions and variables tabs at the top. Create expression first and then create a variable which uses that expression as the formula. There is a tutorial about it here: CFD-Post tutorial - Step 15: Create a Custom Variable and Animate the Display.

AS_Aero · May 29, 2017, 02:45

Hi
I did it and still it was grey. But when I select the wall option in the contour I can see the y+ along the wall.

venturi · May 29, 2017, 07:31

By definition, Y+ is only calculated at the wall. That is why you'll only be able to see it in the walls. The plane is gray because there is no Y+ values for the inner cells.

May 28, 2017, 10:14	Y+ Value Plotting in CFD Post	#1
AS_Aero Senior Member Join Date: Mar 2013 Location: Germany Posts: 357 Rep Power: 14	Hi Is there any way that we can plot the y+ value along our geometry ? When I do a plane and take its contour for y+ in CFD post I can see the value from 0 to 25 but the contour remains grey plane. There its not showing where these values are. So I am not sure where is 25 where is around 0 !! So what is the possiblity ? Also I want to see the log law and z+ values. How can we do these ? Kindly let me know. I did K-W model and for that y+ have to be less than 1 and for LES WALE model what is the y+ criteria ?

May 28, 2017, 18:36	tick; new var	#2
Светлана Senior Member Svetlana Tkachenko Join Date: Oct 2013 Location: Australia, Sydney Posts: 407 Rep Power: 14	> When I do a plane and take its contour for y+ in CFD post I can see the value from 0 to 25 but the contour remains grey plane In the tree view at the left, tick the box next to the contour. If this does not help please attach a screenshot. To create new variables, use the expressions and variables tabs at the top. Create expression first and then create a variable which uses that expression as the formula. There is a tutorial about it here: CFD-Post tutorial - Step 15: Create a Custom Variable and Animate the Display. Last edited by Светлана; May 28, 2017 at 18:37. Reason: add title

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May 29, 2017, 02:45		#3
AS_Aero Senior Member Join Date: Mar 2013 Location: Germany Posts: 357 Rep Power: 14	Hi I did it and still it was grey. But when I select the wall option in the contour I can see the y+ along the wall.

May 29, 2017, 07:31		#4
venturi New Member D. N. Venturi Join Date: Jan 2013 Location: Brazil Posts: 25 Rep Power: 13	By definition, Y+ is only calculated at the wall. That is why you'll only be able to see it in the walls. The plane is gray because there is no Y+ values for the inner cells.