How to set up time in transient thermal analysis?

Hello!
I want to simulate a thermal cycling with time depending. Temperature goes: 20°C (12 hrs), 40°C (14 hrs), 80°C (6hrs), -40°C(6 hrs), 40°C(14 hrs) and 20°C(4 hrs).
I know it might be defined through step controls, however I am not pretty sure about the right set up for time.
Could you help me to clarify that please?
Thank you!
Best Answers
-
peteroznewman Member
@aagallardo What is the Initial temperature of the parts? If it is 20C, then step 1 is irrelevant.
ANSYS computes in seconds. The 40C is 14 hours = 50,400 seconds.
Under Analysis Settings, change Auto Time Stepping to On.
Initial Time Step = 500 seconds or about 1%
Minimum Time Step = 50 seconds or about 0.1%
Maximum Time Step = 5000 seconds or about 10%
Use a similar pattern for the other steps.
-
peteroznewman Member
@aagallardo Change your Step End Time to the correct value first, then you can set the Maximum Time Step to a smaller value.
Answers
@aagallardo What is the Initial temperature of the parts? If it is 20C, then step 1 is irrelevant.
ANSYS computes in seconds. The 40C is 14 hours = 50,400 seconds.
Under Analysis Settings, change Auto Time Stepping to On.
Initial Time Step = 500 seconds or about 1%
Minimum Time Step = 50 seconds or about 0.1%
Maximum Time Step = 5000 seconds or about 10%
Use a similar pattern for the other steps.
Hello Peter!
Yes, the initial temp of the parts if 20°C.
Understood, that was my doubt, it is clear now
Thank you so much, I really appreciate your help!
HI Peter, I tried to set up the time step controls as you suggest, however I get an error: "Invalid maximum time step"
How can I to overcome this issue?
Thank you!
@aagallardo Change your Step End Time to the correct value first, then you can set the Maximum Time Step to a smaller value.
Thanks Peter, it's working now! :D