 ## Ansys Free Student Software

• Natali777898
Subscriber

Hello everyone,

I am trying to calculate a simple gravity VOF case (air +phase2) with the constant viscosity with the magnitude of 1e4 for the phase 2, 1 for the air. It is a 3d model(600K cells, orthogonal quality 0.4, cant make better). If my viscosity equals to 1e5 then the solution is converged, if I decrease the viscosity to 1e4, then there are 200 iterations at each time step and the solution is still not converged. I could not understand why.

I tried to decrease the relaxation parametres, tried to use differens schemes for volume of fraction equation. Could you please help me.

• SRP
Subscriber

Hi,

2) What is volume fraction of phase2?

3) Please share the details of vof model and model use for phase interaction?

3) How you patch phase 2 after initialization?

Thank you

• Natali777898
Subscriber

Hello, thank you very much for your response

Here is my computational domain. There is an inlet on the lower surface, from where phase 2 is extruded into the model domain, the outlet is the upper surface (blue), from where phase 1 exits the domain to guarantee the incompressibility condition. 2) What is volume fraction of phase2?

phase2 is the lava Volume of fraction = 1

phase1 is the air Volume of fraction = 0

3) Please share the details of vof model and model use for phase interaction?

VOF model, implicite, implicite body force,Interface modelling Sharp + interfacial Anti-diffusion. I dont consider phase interaction.

3) How you patch phase 2 after initialization?

I suppose that at the initial time the model domain is filled by air(phase 1), hence there is no phase 2 in the model domain.

Thank you very much for your help! 