change the time step during a run in ANSYS FLUENT

Isar.charmchi · August 18, 2022, 07:53

Hello everybody,

I am looking to change my time step during a run in ANSYS FLUENT. I searched a bit but couldn't find anything. As I am aware that you can do it in ANSYS CFX, I would like to know if it is also possible in ANSYS FLUENT. If yes would you please let me know how?

Thank you in advance for your contribution.

Kummi · August 18, 2022, 09:05

https://www.researchgate.net/post/Ho...n_ANSYS_Fluent

This should help you
Thank you

AlexanderZ · August 18, 2022, 20:23

you may:
1. stop simulation manually. change timestep and continue
2. use TUI commands in journal file to define timestep size and number of steps
3. or use UDF to define DELTAT macro

Isar.charmchi · August 19, 2022, 04:46

Thanks Alexander and Kummi.

Would you please elaborate more on the TUI commands?

MIDHUN@CFD · August 22, 2022, 14:10

if you want to keep courant number below 1 use auto timestep, it can help

August 18, 2022, 07:53	change the time step during a run in ANSYS FLUENT	#1
Isar.charmchi New Member Isar Charmchi Join Date: Aug 2021 Posts: 18 Rep Power: 5	Hello everybody, I am looking to change my time step during a run in ANSYS FLUENT. I searched a bit but couldn't find anything. As I am aware that you can do it in ANSYS CFX, I would like to know if it is also possible in ANSYS FLUENT. If yes would you please let me know how? Thank you in advance for your contribution.

August 18, 2022, 09:05		#2
Kummi Senior Member Kumaresh Join Date: Oct 2016 Posts: 355 Rep Power: 12	https://www.researchgate.net/post/Ho...n_ANSYS_Fluent This should help you Thank you Isar.charmchi likes this.

August 18, 2022, 20:23		#3
AlexanderZ Senior Member Alexander Join Date: Apr 2013 Posts: 2,363 Rep Power: 34	you may: 1. stop simulation manually. change timestep and continue 2. use TUI commands in journal file to define timestep size and number of steps 3. or use UDF to define DELTAT macro Isar.charmchi likes this. __________________ best regards ****************************** press LIKE if this message was helpful

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August 19, 2022, 04:46		#4
Isar.charmchi New Member Isar Charmchi Join Date: Aug 2021 Posts: 18 Rep Power: 5	Thanks Alexander and Kummi. Would you please elaborate more on the TUI commands?

August 22, 2022, 14:10		#5
MIDHUN@CFD Member MIDHUN Join Date: Nov 2012 Location: calicut Posts: 46 Rep Power: 14	if you want to keep courant number below 1 use auto timestep, it can help