Print and Read data every time step

Ollie West · June 18, 2015, 10:30

Hi all,

I am trying to couple the lift experienced by a 2D cylinder to its subsequent displacement. To do this I am trying to implement the following within Star-CCM+.

1. Calculate and print the lift of the cylinder.
2. Read the lift back into Star-CCM+ at the next time step and calculate its velocity, then re print lift at new time step and repeat 1.

I have already managed to force the cylinder to oscillate assuming a simple harmonic motion with an overset mesh and defining the velocity across time steps for the cylinder.

If what I am trying to do is possible within Star-CCM+, how can I print and read in a vector every time step? Is it best to create a macro or can I just auto export/tabular data somehow?

Thanks,

Ollie.

kguntur · June 19, 2015, 06:32

You can use a macro to do this.

Another way is to use a field function with field monitor. You could create a field monitor with sliding window of 1 time step and then use that as your input for the next step.
However, you have to think about what will happen for the first time step.

Could you provide more details of your analysis? I am just curious as to why you want to do this.

June 18, 2015, 10:30	Print and Read data every time step	#1
Ollie West New Member Oliver Westbrook-Netheton Join Date: Jan 2014 Posts: 16 Rep Power: 12	Hi all, I am trying to couple the lift experienced by a 2D cylinder to its subsequent displacement. To do this I am trying to implement the following within Star-CCM+. 1. Calculate and print the lift of the cylinder. 2. Read the lift back into Star-CCM+ at the next time step and calculate its velocity, then re print lift at new time step and repeat 1. I have already managed to force the cylinder to oscillate assuming a simple harmonic motion with an overset mesh and defining the velocity across time steps for the cylinder. If what I am trying to do is possible within Star-CCM+, how can I print and read in a vector every time step? Is it best to create a macro or can I just auto export/tabular data somehow? Thanks, Ollie.

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June 19, 2015, 06:32		#2
kguntur Member kris Join Date: May 2014 Posts: 73 Rep Power: 12	You can use a macro to do this. Another way is to use a field function with field monitor. You could create a field monitor with sliding window of 1 time step and then use that as your input for the next step. However, you have to think about what will happen for the first time step. Could you provide more details of your analysis? I am just curious as to why you want to do this.