Significance of Alpha and Solvers Application
 

May I know what is the significance of alpha in the solver twoPhaseEulerFoam? Is air phase is defined when alpha is 0 whereas water phase is defined when alpha is 1 or vice versa? Is it the same as that defined in one of the tutorials, damBreak case from the interFoam solver, as featured in the user guide?

How does the case bubbleColumn in the solver bubbleFoam differ from the same case in twoPhaseEulerFoam solver?

Kind assistance is greatly appreciated. Thank you! :)

you can see the definition of alpha in the transportProperties.

It's not constrained to air and water, you can define them to any other fluids.

standart solver- air and wather system

alpha = 1 is air, or dispersed fase

but it's your choice the fluids.