Learning Forum

[Conorryan98]

Hi there,

I saw that you should determine your timestep according to the CFL condition t = f(h/c).

I have calculated my t = 1.56151E-06 ms.

However, I am unsure what I should be putting in as the minimum, maximum and initial timestep.

The manual states that for minimum timestep "If the timestep drops below this value, your problem will be terminated." - but i dont know what tolerance I should provide below my desired timestep of 1.56151E-06 ms so that the problem doesn't terminate. Same for maximum timestep.

I want to run my simulation for 1.5ms.

[Akshay Maniyar]

Can I know which version you are using? As it looks old one.
Initial Time Step : If left on Program Controlled (recommended), the initial time step will be automatically set to › of the smallest initial element stability time step.
Minimum Time Step :
ÔÇó If the time drops below this value, the simulation will stop .
ÔÇó If left on Program Controlled (recommended), the value will be set to 1/10 of the Initial Time Step.
Maximum Time Step:
ÔÇó Solver will use the minimum of this value or the computed stability time step
ÔÇó Program Controlled is recommended

regards amaniyar

[Srikanth2307]

In Explicit dynamics, I'm performing impact load test simulation. I have choose 1 time step with end time as 0.5 s and maximum no.of cycles as 100, initial, min., and max. step times are program controlled. Boundary conditions defined as standard earth gravity, displacement of striker towards target freely and I have fixed the target object. But the impact load is not striking the target. Kindly some one help me out.
Thank you
Regards
Srikanth chary

[Akshay Maniyar]

It will be great if you can start a new conversation and add some more details about your model, so that it will be much clearer and easy to answer.
regards amaniyar