[The_Provost]

Hello,

I am performing a simulation (2-D), where a stationary vapor bubble is placed inside a super-heated liquid (water). The temperature, density, viscosity of the bubble is kept constant. I find that inside the bubble, there are two counter-rotating vortex structures when plotting the velocity vectors. Could anybody help me with what could be the possible reasons behind the presence of these vortex structures?

PS 1: I am running the simulation to plot the growth of the bubble as a function of time and compare with the analytical solution. That part is done, and it the results match the analytical ones.

PS 2: I am simulating only a quarter of a bubble, as it is axisymmetric, and two vortex like structures are present in one-quarter. Please see the attached image

Let me know if you need any other information.

Thanks,
The_Provost