How can I change Theta?

Terbulent · May 13, 2020, 19:55

I am analysing an unevenly spaced fan. I am using CFX-Post Turbo Tab to see how hub to shroud is for each blade. I am using single line, streamwise loacation mode. It turns out that no matter what blade I initialized the hub to shroud chart doesn't change at all. It seems like hub to shroud chart shows a specific blade and it can't be changed. And I found because I used streamwise location mode, the hub to shroud chart showed the parameters only at background mesh. However, whatever blade I initialized, the Theta of Background mesh didn't change at all. I found how to change Theta angle in the help file, which says to change environment variable to set zero Theta to be another position. Therefore, could anyone tell me how to change environment variable or any other method of change background mesh to show hub to shroud chart for different blades?
Thank you.

LuComet · May 14, 2020, 15:00

I was doing a similar analysis, and I concluded that the Hub to Shroud function cannot be used to extract data of a blade/channel from a full annulus simulation, as the circumferential average is automatically performed on the entire domain, regardless of what the initialization is.

I posted a workaround here: Circumferential average in CFD-Post

May 13, 2020, 19:55	How can I change Theta?	#1
Terbulent New Member Join Date: Feb 2020 Posts: 4 Rep Power: 6	I am analysing an unevenly spaced fan. I am using CFX-Post Turbo Tab to see how hub to shroud is for each blade. I am using single line, streamwise loacation mode. It turns out that no matter what blade I initialized the hub to shroud chart doesn't change at all. It seems like hub to shroud chart shows a specific blade and it can't be changed. And I found because I used streamwise location mode, the hub to shroud chart showed the parameters only at background mesh. However, whatever blade I initialized, the Theta of Background mesh didn't change at all. I found how to change Theta angle in the help file, which says to change environment variable to set zero Theta to be another position. Therefore, could anyone tell me how to change environment variable or any other method of change background mesh to show hub to shroud chart for different blades? Thank you.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
change the under-relaxation factors	hotboy	FLUENT	4	May 28, 2015 23:25
Mass Transfer without Phase Change in InterPhaseChangeFoam	Parisa_Khiabani	OpenFOAM Running, Solving & CFD	5	May 26, 2015 10:40
No density change - rhoSimplecFoam	krapic	OpenFOAM	1	November 29, 2014 19:39
Help with writing a macro/UDF_file/script to change BC at regular time step intervals	Codophobia	Fluent Multiphase	0	April 24, 2014 11:07
Old OpenFOAM Users, Read This if you Want to Change Username	pete	Site Help, Feedback & Discussions	0	March 16, 2009 05:29

May 14, 2020, 15:00		#2
LuComet New Member Luca Join Date: Jun 2017 Location: Italy Posts: 5 Rep Power: 9	I was doing a similar analysis, and I concluded that the Hub to Shroud function cannot be used to extract data of a blade/channel from a full annulus simulation, as the circumferential average is automatically performed on the entire domain, regardless of what the initialization is. I posted a workaround here: Circumferential average in CFD-Post