[wjchoi]

hello, i am beginner of OpenFOAM

when i used the multiphaseEulerFoam slover which can calculate the multi compressive fluids including heat transfer, i had one question.

when i simulated the air injection into the water (research topic : assessment of two phase circulation enhanced by air injection), the alpha values of air (ex) alpha.air), in other words, the void fraction of air seems underestimated.

when i compared the OpenFOAM results with experiment results which were conducted in our laboratory, the void fraction of air is so much underestimated.

for example, at the 1lpm air injection rate case, the experiment shows the average void fraction of air in the water is 10%, however, in my OpenFOAM case, the average void fraction of air in water is less than 1%..

but, when i compared the velocity of water enhanced by driving force which came from air bubbles, the velocity values between openfoam and experiment are similar with each other (of course, the water velocity calculated by openfoam is also underestimated compared with experimental values)

so is there anyone who knows the reason why the void fraction of air is underestimated in multiphaseEulerFoam of OpenFOAM?

thank you for reading my post!