I want to get similar result with a particular project I’ve seen before because it is similar to my project. The difference is only the gas emission; I choose SO2 as the gas variable (the diffusion coefficient and the flux are the differences).
The similar project;
The problem is my passive scalar result is different with the project example; my passive scalar result is too high from what it has to be. Is it because the variable or something else? I am still learning about CFD software as well, so I don’t really understand about this. And also, my area average isn’t showing any result. Do you know why?
hi, me again. I want to ask for the result again.
I want to search for ppm result for this simulation, but why my result still exceeds the project example? The result is supposed to be less than 1000 but mine is exceeding the number. Do you know why? And I’ve already done what you’ve told me to do, but the result is still the same.
every run is exceeding the number but you can look at run “velocity 3.3” because it has final variable. I am confused about the passive scalar unit, I followed the project example to get similar ppm, but I don’t understand why the passive scalar result is so high; is my ppm concentration really that high or there is still something wrong with my model’s variable?
I noticed that you are going through my old tutorial
The issue here is the scale of the model. As the name suggests, the volumetric scalar source is based on the assigned volume. In your case, the model seems to be oversized by a factor of 1000 (I’d guess):
You can think of the T1 values as a concentration of passive scalar. For your first simulation, the velocity inlet of fresh air was 10 meters per second, and for the second simulation you have 0.15 meters per second.
Since we have less fresh air going in and the same quantity of scalar being generated, the concentration of the passive scalar goes up. In short, this is expected.
Hi, I want to ask about a similar issue from the above.
Now I want to simulate NO2 within the same model of the house.
Using the same model, I am not able to simulate as the run time always exceeds the maximum runtime.
Is there any error within my model? should I erase some simulation results?