Question regarding explosions energy density

[Reiner04]

So I've seen few calcs which assumes energy density throughout the explosion volume to be same and thus, do Volume*destructive value of object under explosion. And some uses regular explosion formula. I wanted to know in which case we use what method among these 2, as they're obviously not interchangeable.

 

[KLOL506]

@DontTalkDT

 

[DontTalkDT]

If I understand the question correct, then the answer is that we usually use inverse square law.