More Samples in Turbo Chart

Shauny · February 6, 2015, 07:12

Hey,

my name is shauny and this is my first thread here. I investigate the influence of the boundary layer on a centrifugal compressor flow passage. For this is calculated the boundary layer profile (total pressure in stn frame over normalized span) and provided it as a boundary condition at the Inlet. After simulation I wanted a hub to shroud profile at a certain streamwise location.

Problem: There are to little sample points in my boundary layer area so that I can't analyse the boundary layer profile.
Is there a possibility to get more sample points in this area?

I already tried the distribution modes "equal distance" and "mesh density based".
I also tried it with a contour plot and manual distribution but CFX Post limits the number of positions after the decimal points of the inserted radius to 7 (I'd like to have up to 11 positions if possible).
Polylines also have to little sample points.

The only thing which works is a "normal" line but it's difficult to analyse a straight line which do not lie completely in a curved turbosurface.

The mesh density is 6*10^-7 [m] at both the hub and the shroud.

I hope you can help me.

Best regards

Shauny

ghorrocks · February 7, 2015, 01:24

Can you show a picture of the problem? Are there too few sample points in the boundary you are applying or in the data you are extracting from your simulation?

6e-7[m] means your mesh is less than a micron. Are you modelling a tiny object? Otherwise your mesh sounds too fine. Please show a picture of your mesh as well.

February 6, 2015, 07:12	More Samples in Turbo Chart	#1
Shauny New Member Join Date: Feb 2015 Posts: 1 Rep Power: 0	Hey, my name is shauny and this is my first thread here. I investigate the influence of the boundary layer on a centrifugal compressor flow passage. For this is calculated the boundary layer profile (total pressure in stn frame over normalized span) and provided it as a boundary condition at the Inlet. After simulation I wanted a hub to shroud profile at a certain streamwise location. Problem: There are to little sample points in my boundary layer area so that I can't analyse the boundary layer profile. Is there a possibility to get more sample points in this area? I already tried the distribution modes "equal distance" and "mesh density based". I also tried it with a contour plot and manual distribution but CFX Post limits the number of positions after the decimal points of the inserted radius to 7 (I'd like to have up to 11 positions if possible). Polylines also have to little sample points. The only thing which works is a "normal" line but it's difficult to analyse a straight line which do not lie completely in a curved turbosurface. The mesh density is 6*10^-7 [m] at both the hub and the shroud. I hope you can help me. Best regards Shauny

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Cannot find turbo variable 'Streamwise Location'.	Veronique Pe	CFX	2	June 24, 2015 07:32
Dynamic 2d chart	ghost82	EnSight	2	October 24, 2014 18:07
Blade Loading turbo Chart?	prayskyer	CFX	4	August 26, 2012 06:30
Gambit turbo problem.	sujan.dasmahapatra	FLUENT	0	December 20, 2009 06:21
Chart empty	anna_67	CFX	2	July 27, 2009 08:52

February 7, 2015, 01:24		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 18,017 Rep Power: 146	Can you show a picture of the problem? Are there too few sample points in the boundary you are applying or in the data you are extracting from your simulation? 6e-7[m] means your mesh is less than a micron. Are you modelling a tiny object? Otherwise your mesh sounds too fine. Please show a picture of your mesh as well.