Learning Forum

[Adisa]

Hello,

I am doing sphere test  like this:

https://forum.ansys.com/forums/topic/sphere-test/

I apply the initial velocity 3,7 m/s on the ball, but in the results the velocity  of the ball grow up to 3,7337 m/s but the velocity of the part is 4

Can anyone explain.

Transient structural2 Ansys 18.2

[peteroznewman]

Hello Adisa,

1. You didn't change the Step End time from the default of 1 second to something relevant to your problem, like 1e-2

2. You have an Initial Time Step of 3.7e-3, but the object travelling at 3700 mm/s will have moved 13.69 mm in that time. Try an Initial Time step at least 10 times smaller, I have set 1e-4 and I set the Maximum Time Step to 1e-3.

I ran with the settings above and here is the contact pressure result. You can see that at 1e-2 seconds, the ball has bounced off the bar.

Here is the directional velocity of the ball. It starts at the initial velocity, and rebounds with a smaller velocity.

You have two planes of symmetry that would allow you to solve a 1/4 model, saving you some time.

Regards,

Peter

 

 

[Adisa]

Peter thanks.Now it is OK.