should be Fluent or CFD, transient simulation. Pay attention to the model mesh. I suggest you should search some examples and read the help document. Good luck.

Thank you

Hi saad.

You have to use unsteady model in fluent and set time step small as you can. and you have to use 2 phase model including vapor and liquid. Do you simulate forming bubble or you want simulate motion of bubble in liquid? for example do you need simulate colliding 2 bubble with each other?

Hi Iman.

I want simulate motion of bubble in liquid. Thank you.