[nikiforov_sergey]

Hello, everyone!

I am currently working on the model of laser acoustic welding in ANSYS CFX.
One of our targets is to find out the effects of acoustic waves on the molten pool flow.

In a nutshell, my model is the following:
1. Material - Stainless Steel, which is modelled as a fluid with high viscosity. Basically, in order to model the phase change in liquidus solidus interval, the viscosity is changing according to the attached grapth.
2. On the top surface of the domain I have the laser heat source as gaussian heat source model.
3. At the bottom surface at the point, I wanna apply the periodic acoustic wave and see how the pressure will distribute through the domain and effect the molten pool flow.

I've tried to do it by apllication of a specified shear stress at z-direction at the whole bottom boundary surface. But unfortunately it does not work.

Could anybody share any experience of how to apply a periodic acoustic wave in ANSYS CFX, please?

Thank you in advance!

[ghorrocks]

CFX is not ideal to model solid/liquid transition, and welding is even more complex than that. And you are adding acoustics to that as well..... Are you sure CFX is the best software to use for this model?

Why did your shear stress approach not work? How did you do it? What effect did it fail it capture?

To generate an acoustic wave you need to vibrate the flow (obviously). You can do this with a shear stress, an opening or with moving mesh. With a bit of imagination you might be able to figure out other ways to generate some vibrations.

But your shear stress approach sounds the simplest approach if we can get that to work.