Hi all, new to the forum.
First off, some details on my simulations:
Do you have any suggestions for me to try and see this?
Does this have anything to do with tweaking the numerics or physics tabs to provide these results.
Thanks in advance!
A few more things to add:
I have tried using two different type of boundary conditions:
On the other hand, the velocity may be effecting my simulation because no matter what the viscosity of the material is in the simulation (considering it is always changing based on temperature and strain), the velocity boundary condition will continue to push the material through the mesh no matter what. Is there any way to "cap off" the pressure that is available in the simulation while using the velocity boundary condition?
Sounds like a pretty complex process to model.
When modeling turbulence using a k-epsilon or any other turbulence model that is based on time-averaged quantities, you will not see any additional mixing and vortexing. Turbulence is modeled by averaging all fluctuations and presenting you with the mean flow. So it looks like laminar flow, but the viscosity is much higher than the molecular value, which enhances the momentum diffusion thus accounting for turbulent fluctuations.
There is no way to combine pressure and velocity BC at the inlet. You will have to define your BC at a reasonable location, where the flow conditions are known best at all time during the filling process. You are right that using the machine pressure does not make sense when there is no or little metal in the cavity.
Regarding the 'tunneling' effect. Why do you think it flows along the walls first? Could it be an artefact of the short shots? For example, could metal solidify at the walls quickly, while the metal in the core drains elsewhere thus creating the effect of tunneling?
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