Hi
We are simulating injection of air bubble in flowing water (to reduce frictional resistance) by using STAR CCM. We are facing difficulties in formation of air bubble in simulation. It has 3D Geometry
Does anyone know setting of formation of air bubble in water in STAR CCM?
Hi,
Actually, I'm not familiar with STAR CCM, but on my knowledge for such kind of problem, you may need, added to navier stokes equations for fluid flow, an interface tracking method like Volume of Fluid, Level Set or Phase Field methods to follow up the evolution with time of the interface between the two immisicble fluids (air and water in you case).
Regards,
Zahreddine
use a stroboscopic camera to capture the snapshot of the bubbles; then you can use Visilog or similar softwares to measure the size of the bubble...
https://repositorium.sdum.uminho.pt/bitstream/1822/16699/1/pp.pdf
https://www.cfd-online.com/Forums/openfoam/92667-problem-two-phase-flow-air-injected-water.html
We need more information regarding your case, I guess. Despite the fact that the position of the bubble inlet (bulk flow or close to wall or bottom) is very important, I can imagine three general scenarios:
1) Low fluid velocity and large gas flow rate: large bubble cavity can be generated. My recommendation: VoF Model.
2) High fluid velocity and low gas flow rate: bubbles get immediately disrupted near the inlet and possibly break up further through shear forces. My recommendation: Lagrange Particle Tracking (maybe combined with a proper bubble break-up model).
3) High fluid velocity and high gas flow rate: bubbles can coalesce and breakup as well. My recommendation: Euler-Euler Model or Mixed VoF-Euler-Euler Model like in the Solver multiphaseEulerFoam in the OpenFOAM software
Unfortunately, I never worked with Star-CCM+.
- Badges
- Science topic
- Similar topics
- Chemistry
- Pharmacology
- Pharmaceuticals
- Drugs