{"id":357469,"date":"2024-03-17T10:01:27","date_gmt":"2024-03-17T10:01:27","guid":{"rendered":"\/forum\/forums\/topic\/dissolved-oxygen-simulation\/"},"modified":"2024-05-31T14:56:27","modified_gmt":"2024-05-31T14:56:27","slug":"dissolved-oxygen-simulation","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/dissolved-oxygen-simulation\/","title":{"rendered":"Dissolved Oxygen Simulation"},"content":{"rendered":"

Hi, I’m currently doing a simulation regarding dissolved oxygen in a pond containing liquid water. I want to validate the graph of the increase in dissolved oxygen concentration against time from experiments conducted by Du (https:\/\/www.sciencedirect.com\/science\/article\/pii\/S0144860919301815).
So, on the inlet side, air in the form of bubbles (oxygen) enters from the bottom of the pool and the outlet is at the surface of the pool. I set water (liquid water + oxygen) as the primary phase and oxygen as the secondary phase. I used the multiphase mixture model for this case after reading various references. Then, I turned on species mass transfer and set it from air bubbles to water with species in the form of o2. The results I found were only after 6 iterations, the simulation became divergent and “floating point exceptions” appeared. Below I show the setup that I made. My question is:
1. Is my setup correct? If there is something wrong, which one should be corrected?
2. Does the mixture material only exist as a gas phase? Because when I look at the properties of the mixture that I made it shows that it is only for the gas phase? How do you set up the liquid phase as a mixture?
3. Do I have to input the o2 source terms value in the cell zone conditions? If I must, I do not have any references from the paper I refer to because the research conducted was experimental.
I’m still very new to this. I’ve been stuck for almost two months, so I’m asking for your help. Thank you very much for all your help..\"\"<\/a>\"\"<\/a>\"\"<\/a>\"\"<\/a>\"\"<\/a><\/p>\n","protected":false},"template":"","class_list":["post-357469","topic","type-topic","status-closed","hentry","topic-tag-Dissolved-1","topic-tag-mass-transfer","topic-tag-mixture","topic-tag-multiphase"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t