Gas Mass Data question

[boyu-dotcom]

"What I would like to ask about this function is whether the data it generates represents the mass produced during combustion. I'm not quite sure what the data generated by enabling this function actually represents—does it refer to the mass of gases produced at any given time, or the total mass generated over the entire simulation period, as mentioned in the user guide?"

[drjfloyd]

It is the mass in the domain at that point in time.

[boyu-dotcom]

"There's one more thing I'd like to confirm: if I want to determine the total mass of a certain gas from this dataset, should I sum up all the values, or should I subtract the first value from the last one to get the result?"

[drjfloyd]

Let's say you have a domain that is a single 1 m3 grid cell. The top is open and at the bottom you inject 1 kg/s of gas at a density of 1 kg/m3. Your mass file would be:

Time, Mass
0, 0
1,1
2,1
3,1
4,1
5,1

.

[boyu-dotcom]

This chart shows the data generated from my simulation settings. I'd like to confirm—does this function provide instantaneous values? If so, that would mean I shouldn't sum up all the values to determine the total mass over the simulation duration, correct?"

[drjfloyd]

Yes, values are the instantaneous mass in the domain at that time.