Hi, guys:

When I use ls-dyna for the numerical simulation of millisecond blasting, I find that my explosives (after initiation) are always affected by the explosives with the first initiation point.

I used the fluid-structure coupling method. The explosive for each blasthole is a separate component. I set the initial time of blasting to 0 ms,10 ms, 20 ms. But The explosion happened before the set time.

What kind of changes should I make to achieve the effect of millisecond blasting? Change model or K file？