Learning Forum

[H_E]

Hi,

I'm a beginner in Ansys and I would like to simulate the melting of a filament in the nozzle similar to the diagram attached. What models and boundary conditions should I use?

Thanks.

[DrAmine]

Is the filament already molten as it escapes the nozzle?n

[H_E]

yes.n

[DrAmine]

And you want to simulate the domain outside the nozzle? Will the melt solidify?n

[H_E]

I want to simulate the domain inside the nozzle. I would like to observe the pressure, temperature and velocity distribution of the melt.n

[DrAmine]

Okay so only nozzle melt flow all liquid, right? n

[H_E]

The inlet is solid and it melts and flow out of the nozzle.n

[DrAmine]

So you might use solidification and Melting Model with a sort of pulling effect solid at the inlet section.n

[H_E]

How can I do that ? I tried to use velocity inlet and specifying the velocity magnitude and pressure outlet but the results seem to be incorrect. I also tried to specify the initial gauge pressure at the velocity inlet but it doesn't seem to have any effect on the pressure distribution.n

[DrAmine]

You might ignore at first ignore the mushy zone and not freeze the solid motion. Can you add more info?n

[H_E]

Below are the boundary conditions I set for this simulation:nVelocity inlet: velocity magnitude 0.001 m/s normal to boundary, temperature 300KnPressure Outlet: gauge pressure 0 PanWall: stationary wall, no-slip condition, temperature 543KnI get this pressure distribution but I expect a pressure change to occur at the nozzle tip (the section where there is a dimensional change).nI then tried to specify the initial gauge pressure of 1.64e6 Pa at the velocity inlet boundary condition window but I still get the same result.