Learning Forum

[Venkatesh Mani]

 

Hello sir., thanks for the reply., 

How did you get 0.09 s for the time in the barrel?  That seems too long.

Assuming constant pressure throughout the barrel.,

0.09 I just kept randomn value for timesteps. with a constant pressure of 90 PSI ( 620538 pa). The bullet is exiting the barrel at 0.008secs. refer snip 1 & 2

What was the exit velocity? 

The Bullet velocity is 37m/s at exit of barrel. refer snip 1 & 2

What drag force are you using after the pressure on the back is gone?

Air resistance of 0.189N (Drag force calculated) is given at front face of bullet

What are your analysis settings for Initial, Minimum and Maximum Time increment for each step?

Total step end time i set to 0.03secs and  I’ve turned off Auto time stepping and gave time step of 0.001secs. Refer snip 3

 

I have practically done this and found bullet is hitting the ground at 8m away in 1.5secs when fired horizontally. I want to prove the same over analysis.

So if i set the time to 1.5secs am getting solver error/Insufficient ram. how do i overcome this sir.