Lagrangian particle tracking in periodic flow

jabeken · October 21, 2019, 10:56

Hi Everyone

Is there any in Star-CCM+ to conduct Lagrangian particle tracking in a*periodic flow field by repeating the periodic flow-field without recomputing it?

To give a bit more detail:
My problem involves a periodic flow of 2.5Hz with a non-zero mean flow. The magnitude of the mean flow rate is around 1% of the oscillating flow rate.
Due to the oscillation my timestep is currently around 0.01 s. However, due to the small mean flow the particle will take approximately 20 hours to travel from the injector to the outlet.

Simply computing 20 hours of periodic flow with a time-step of 0.01 s is not only unnecessary*but also unfeasible for me.

So I was wondering*if there is a way to basically compute the flow field for one complete period and then compute Lagrangian particle pathways based on a repeating cycle of this flow field without recomputing it each time.

I would really appreciate any help!

Thank you and best regards
Jonas

alpie · October 22, 2019, 15:28

Why don't you contact STAR-CCM+ technical support?

rezaeimahdi · April 11, 2021, 10:07

Dear Jonas

Could you please let me know if you find an answer to this question?

In fact, I have a simulation that has oscillation on background flow. I don't know if I can rely on background flow when I freeze the solver to run the lagrangian solver.

Thank you

October 21, 2019, 10:56	Lagrangian particle tracking in periodic flow	#1
jabeken New Member Jonas Abeken Join Date: Apr 2018 Location: Zurich Posts: 10 Rep Power: 8	Hi Everyone Is there any in Star-CCM+ to conduct Lagrangian particle tracking in aperiodic flow field by repeating the periodic flow-field without recomputing it? To give a bit more detail: My problem involves a periodic flow of 2.5Hz with a non-zero mean flow. The magnitude of the mean flow rate is around 1% of the oscillating flow rate. Due to the oscillation my timestep is currently around 0.01 s. However, due to the small mean flow the particle will take approximately 20 hours to travel from the injector to the outlet. Simply computing 20 hours of periodic flow with a time-step of 0.01 s is not only unnecessarybut also unfeasible for me. So I was wondering*if there is a way to basically compute the flow field for one complete period and then compute Lagrangian particle pathways based on a repeating cycle of this flow field without recomputing it each time. I would really appreciate any help! Thank you and best regards Jonas

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October 22, 2019, 15:28		#2
alpie New Member Join Date: Oct 2019 Posts: 5 Rep Power: 6	Why don't you contact STAR-CCM+ technical support?

April 11, 2021, 10:07		#3
rezaeimahdi Member mahdi Join Date: Nov 2015 Location: Paris, France Posts: 32 Rep Power: 10	Dear Jonas Could you please let me know if you find an answer to this question? In fact, I have a simulation that has oscillation on background flow. I don't know if I can rely on background flow when I freeze the solver to run the lagrangian solver. Thank you