How to export pressure along contour vs. time

GaudyZebra · September 25, 2024, 19:11

I'm trying to run a 2D transient model of turbulent external flow over a cylinder. I'd like to obtain the pressure over the cylinder surface vs. time. Ultimately, I'd like a 2D array of pressure values, with position (samples along cylinder wall) along one dimension, and time along the other.

In FLUENT and Post, I can plot the pressure over the cylinder surface, and in Post, select the time step. I figured out a way in Post to automate changing the time steps and export the chart data, but it was very slow. Is there a simple way to export this 2D data in FLUENT or Post or EnSight?

HHOS · September 26, 2024, 12:18

Play around in the TUI in order to obtain the command that you'd need in order to create a plot like the one you are mentioning and writing it out to a file.

You can put that command in "calculation activities" to run the command every iteration or timestep.

The filename should include in it %i for iteration or %f for flow time (maybe %t for timestep number, not sure), that way if your file is called "Pressure_on_cylinder_%f.xy", it will replace the %f for the flow time.

If you work with ensight and have a transient export, I would show the plot in Ensight and with the help of a little python script you can go over every timestep exporting the plot.

I don't know if it will help...

Cheers.

September 25, 2024, 19:11	How to export pressure along contour vs. time	#1
GaudyZebra New Member Join Date: Sep 2024 Posts: 1 Rep Power: 0	I'm trying to run a 2D transient model of turbulent external flow over a cylinder. I'd like to obtain the pressure over the cylinder surface vs. time. Ultimately, I'd like a 2D array of pressure values, with position (samples along cylinder wall) along one dimension, and time along the other. In FLUENT and Post, I can plot the pressure over the cylinder surface, and in Post, select the time step. I figured out a way in Post to automate changing the time steps and export the chart data, but it was very slow. Is there a simple way to export this 2D data in FLUENT or Post or EnSight?

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September 26, 2024, 12:18		#2
HHOS Member Join Date: Jul 2013 Posts: 98 Rep Power: 13	Play around in the TUI in order to obtain the command that you'd need in order to create a plot like the one you are mentioning and writing it out to a file. You can put that command in "calculation activities" to run the command every iteration or timestep. The filename should include in it %i for iteration or %f for flow time (maybe %t for timestep number, not sure), that way if your file is called "Pressure_on_cylinder_%f.xy", it will replace the %f for the flow time. If you work with ensight and have a transient export, I would show the plot in Ensight and with the help of a little python script you can go over every timestep exporting the plot. I don't know if it will help... Cheers.