Transient Statistics for turbo components

Suzzn · April 30, 2010, 12:24

Hello guys,

i`ve made a transient simulation of a centrifugal compressor and want to get the averaged data of the velocity components for the last rotation of the impeller. So i used the transient statistics tab (output control) in PRE and defined the last timesteps for averaging and the variables I considered necessary. I need to plot the velocity streamwise in a blade-to-blade-view, but i do not get the averaged data of this velocity-component. I get the "Velocity in Stn Frame. Trnave Circumferential", Velocity in Stn Frame. Trnave Blade to Blade", but some components are missing like: "Velocity in Stn Frame. Trnave Spanwise", "...Axial","...Radial" and "...Streamwise". So I restarted the simulation and defined all possible variables for the averaging to go sure that no variable was missing for the calculation. But still the same averaged turbo-velocity components (Spanwise, Axial, Radial and Streamwise) are missing and i cannot plot them. The normal components, that are not averaged are all there. What am i doing wrong or is it not possible to make a transient statistics-average for all turbo-components?

I´m thankful for all hints...

Abou ali · April 30, 2010, 20:24

Hi,
You can use the Turbo option in CFX-Post, it calculate easily the turbo-variables.

Suzzn · May 1, 2010, 08:45

Hello Abou Ali,

i can calculate all the turbo velocity components in the turbo option of POST and I get all components for a full.trn-file there. But i need the averaged data of 60 full.trn-files (transient statistics) of all the turbo velocity components. And some of the components like the velocity streamwise are not averaged by CFX.

Abou ali · May 2, 2010, 10:02

Did you create a transient statistic file using the CFX-Pre output control panel? If yes try to use it in CFX-Post with the turbo tool.

Suzzn · May 4, 2010, 05:00

Hellow Abou,

thats exactly what i did. I created an transient statistics file in the output panel of PRE. With the result-file i use the turbo tool. I initialise the rotating impeller and calculate the turbo velocity components. So I get the circumferential and bladetoblade-velocity transient-averaged, but the averaged streamwise-velocity is missing! I get the velocity streamwise for one timestep, but not transient averaged. It´s confusing I know...

Suzzn · May 4, 2010, 10:56

Hello,

it seems to be a problem with Ansys 12.0. Now I tried it with Ansys 12.1 and I get all transient-averaged turbo velocity components.

April 30, 2010, 12:24	Transient Statistics for turbo components	#1
Suzzn Member Susann Join Date: Apr 2009 Location: Dresden Posts: 33 Rep Power: 17	Hello guys, i`ve made a transient simulation of a centrifugal compressor and want to get the averaged data of the velocity components for the last rotation of the impeller. So i used the transient statistics tab (output control) in PRE and defined the last timesteps for averaging and the variables I considered necessary. I need to plot the velocity streamwise in a blade-to-blade-view, but i do not get the averaged data of this velocity-component. I get the "Velocity in Stn Frame. Trnave Circumferential", Velocity in Stn Frame. Trnave Blade to Blade", but some components are missing like: "Velocity in Stn Frame. Trnave Spanwise", "...Axial","...Radial" and "...Streamwise". So I restarted the simulation and defined all possible variables for the averaging to go sure that no variable was missing for the calculation. But still the same averaged turbo-velocity components (Spanwise, Axial, Radial and Streamwise) are missing and i cannot plot them. The normal components, that are not averaged are all there. What am i doing wrong or is it not possible to make a transient statistics-average for all turbo-components? I´m thankful for all hints...

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
transient statistics for turbo components	Sonja	CFX	0	December 8, 2008 09:34
Transient Statistics for LES	Sungho Yoon	CFX	0	August 4, 2008 12:12
Transient statistics for LES simulation	jonathan	CFX	0	March 5, 2008 16:51
Transient statistics for LES simulation	jonathan	CFX	0	March 5, 2008 16:24
Using Transient Statistics results for tracer exp.	houman	CFX	11	August 15, 2005 04:46

April 30, 2010, 20:24		#2
Abou ali Member Join Date: Nov 2009 Posts: 49 Rep Power: 16	Hi, You can use the Turbo option in CFX-Post, it calculate easily the turbo-variables.

May 1, 2010, 08:45		#3
Suzzn Member Susann Join Date: Apr 2009 Location: Dresden Posts: 33 Rep Power: 17	Hello Abou Ali, i can calculate all the turbo velocity components in the turbo option of POST and I get all components for a full.trn-file there. But i need the averaged data of 60 full.trn-files (transient statistics) of all the turbo velocity components. And some of the components like the velocity streamwise are not averaged by CFX.

May 2, 2010, 10:02		#4
Abou ali Member Join Date: Nov 2009 Posts: 49 Rep Power: 16	Did you create a transient statistic file using the CFX-Pre output control panel? If yes try to use it in CFX-Post with the turbo tool.

May 4, 2010, 05:00		#5
Suzzn Member Susann Join Date: Apr 2009 Location: Dresden Posts: 33 Rep Power: 17	Hellow Abou, thats exactly what i did. I created an transient statistics file in the output panel of PRE. With the result-file i use the turbo tool. I initialise the rotating impeller and calculate the turbo velocity components. So I get the circumferential and bladetoblade-velocity transient-averaged, but the averaged streamwise-velocity is missing! I get the velocity streamwise for one timestep, but not transient averaged. It´s confusing I know...

May 4, 2010, 10:56		#6
Suzzn Member Susann Join Date: Apr 2009 Location: Dresden Posts: 33 Rep Power: 17	Hello, it seems to be a problem with Ansys 12.0. Now I tried it with Ansys 12.1 and I get all transient-averaged turbo velocity components.