CFX Post: Possible to display all timesteps together?

Didi · September 29, 2016, 08:06

Hi all,

got a little problem, but maybe you can help me

I am modelling the flow through a pipe with a transient simulation using CFX and want to export vectors at a specific point at the single timesteps.

I’ve inserted a Point at the desired location and am able to display the vector in the 3D-viewer at the selected timestep.

But, is there any chance to display the vectors of all the timesteps in one viewer together, maybe even in a plot? And is there an easy way to display the different components (X, Y and Z) of the vector in CFX Post without exporting it to a .csv-file?

Many thanks for your help in advance!!!

Didi · October 25, 2016, 00:22

Unfortunately, I couldn't find a solution yet. Is there maybe anybody with an idea?

Danielrs95 · December 28, 2016, 16:18

Hi Didi! I'm having the same problem that you, I need to evaluate an expression in diferent timesteps but I can't be able to find how to do it. If I learn anything I will let you know.

Have a nice day, Daniel

evcelica · January 10, 2017, 17:22

You should be able to plot this, and make an animation.

Chart
Create an expression: probe(velocity u)@Point 1
Create a chart where you plot this expression vs time.

Animation:
Show your vector that you want to animate.
click on animation, quick animation, pick your vector and play/save the animation.

Didi · January 12, 2017, 11:00

Hi evcelica,

many thanks for your reply!

I am not sure if I am doing it right, but when plotting the expression vs time, I only get the absolute values. Is there also a way, to plot the bundle of vectors as arrows to see the direction, the different vectors point at?

In fact, what I can get in the animation, is the thing, I am looking for, but just in one plot?

evcelica · January 12, 2017, 17:12

Do you have (Plot absolute values) checked on your chart definition?

I don't know how to make a vector plot of all time steps at once though.
Maybe create the animation, and output as images instead of video. Then take these images and merge them together using some 3rd party software or a website like this one: https://www.mergeimages.com/

brunoc · January 16, 2017, 07:04

You can't do this directly. Post only shows one timestep at a time.

What you can do is export the velocity field of each timestep, reload it and then create one vector plot for each. It is a very manual process, but with a bit of scripting it can be automated.

Cheers

September 29, 2016, 08:06	CFX Post: Possible to display all timesteps together?	#1
Didi New Member Join Date: Jun 2015 Posts: 3 Rep Power: 11	Hi all, got a little problem, but maybe you can help me I am modelling the flow through a pipe with a transient simulation using CFX and want to export vectors at a specific point at the single timesteps. I’ve inserted a Point at the desired location and am able to display the vector in the 3D-viewer at the selected timestep. But, is there any chance to display the vectors of all the timesteps in one viewer together, maybe even in a plot? And is there an easy way to display the different components (X, Y and Z) of the vector in CFX Post without exporting it to a .csv-file? Many thanks for your help in advance!!!

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October 25, 2016, 00:22		#2
Didi New Member Join Date: Jun 2015 Posts: 3 Rep Power: 11	Unfortunately, I couldn't find a solution yet. Is there maybe anybody with an idea?

December 28, 2016, 16:18		#3
Danielrs95 New Member Daniel Ramirez S Join Date: Dec 2016 Posts: 6 Rep Power: 10	Hi Didi! I'm having the same problem that you, I need to evaluate an expression in diferent timesteps but I can't be able to find how to do it. If I learn anything I will let you know. Have a nice day, Daniel

January 10, 2017, 17:22		#4
evcelica Senior Member Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 1,188 Rep Power: 23	You should be able to plot this, and make an animation. Chart Create an expression: probe(velocity u)@Point 1 Create a chart where you plot this expression vs time. Animation: Show your vector that you want to animate. click on animation, quick animation, pick your vector and play/save the animation.

January 12, 2017, 11:00		#5
Didi New Member Join Date: Jun 2015 Posts: 3 Rep Power: 11	Hi evcelica, many thanks for your reply! I am not sure if I am doing it right, but when plotting the expression vs time, I only get the absolute values. Is there also a way, to plot the bundle of vectors as arrows to see the direction, the different vectors point at? In fact, what I can get in the animation, is the thing, I am looking for, but just in one plot?

January 12, 2017, 17:12		#6
evcelica Senior Member Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 1,188 Rep Power: 23	Do you have (Plot absolute values) checked on your chart definition? I don't know how to make a vector plot of all time steps at once though. Maybe create the animation, and output as images instead of video. Then take these images and merge them together using some 3rd party software or a website like this one: https://www.mergeimages.com/

January 16, 2017, 07:04		#7
brunoc Senior Member Bruno Join Date: Mar 2009 Location: Brazil Posts: 277 Rep Power: 21	You can't do this directly. Post only shows one timestep at a time. What you can do is export the velocity field of each timestep, reload it and then create one vector plot for each. It is a very manual process, but with a bit of scripting it can be automated. Cheers