fds leak velocity

[yILCCY]

I use the fds to simulate the methane and hydrogen leaking, Setting the velocity is 33.4 m/s, And run in 10s, But the result see the max velocity just 10 m/s. Why not is 33.4 m/s. Please give me some advise, I'm a newer,Thank you!

[marcosvanella]

Can you post the text (not .png) of the input file?

[yILCCY]

untitled.txt
If you want to run in fds, you need Modify the suffix '.txt' to ‘.fds’

[drjfloyd]

You have 50 cm grid cells and your jet is 50 cm x 50 cm. You have one grid cell across the vent. Do you feel your calculation is sufficiently resolved? Have you done a grid study to determine if you have adequate grid resolution?

[yILCCY]

Does grid resolution will affect speed？OK I'll try again!

[marcosvanella]

Also, add CELL_CENTERED=T in your velocity slice. What normal velocity do you see exactly where the VENT is?