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-   -   metallic fluid intake in the form of a droplet through a section of 1 mm diameter (http://www.cfd-online.com/Forums/cfx/118916-metallic-fluid-intake-form-droplet-through-section-1-mm-diameter.html)

taissir June 6, 2013 12:13

metallic fluid intake in the form of a droplet through a section of 1 mm diameter
 
I would like to simulate a metallic fluid intake in the form of a droplet through a section of 1 mm diameter. the area is occupied by the air intially. who has an idea about the condition that I should impose as inlet ?

Thanks in advance for any comments

Best Regards

ghorrocks June 6, 2013 19:16

This sounds like a multiphase model with air and metallic droplets. There are many different multiphase models in CFX, do the tutorials to see them all. You will need to choose the correct model appropriate to your flow.

ghorrocks June 6, 2013 19:16

This sounds like a multiphase model with air and metallic droplets. There are many different multiphase models in CFX, do the tutorials to see them all. You will need to choose the correct model appropriate to your flow.

taissir June 7, 2013 05:11

I tried to simulate the flow as a two-phase flow. I imposed as inlet the metal fluid as a dispersed fluid with 1mm diameter. but I get results a continuous flow and not in the form of droplets. I do not know if I explained well.

ghorrocks June 10, 2013 22:28

No, you have not explained it well. Please post an image and describe in detail what you expect the flow to do.

taissir June 11, 2013 06:51

1 Attachment(s)
Metal transfer in gas metal arc welding refers to
the process of transferring material of the welding wire in
the form of molten liquid droplets to the workpiece. as it is not possible to simulate the fusion of the metal using Ansys CFX, i will introduce a fluid metalique in the form of droplet. the final obectif is to obtain the shape of the weld pool.

ghorrocks June 11, 2013 08:16

What are you doing the model to learn? It will take you years to get the whole current, melting, ejecting drop, splat and solidification thing working, so you need to break it down into something more tractable in a reasonable time frame.

taissir June 11, 2013 08:45

I'm a phd student. I work on the modeling of welding. I know it's not been previously treated with Ansys CFX. I discussed in my master about the two-phase flow with Ansys Cfx, hence the idea of ​​the problem treated as a three-phase flow. at first I think I'll merely solve the isothermal problem, without modeling the melting and solidification, just the introduction of droplets and deposit on the base metal. but I can not introduce metal fluid as Drop.

ghorrocks June 11, 2013 20:51

This is a very complex model, so I trust you expect the development of this model to take years.

I would look at the physics in sections - a model which only has free surface modelling, a model which only has melting of the solid and a model which only has the solidifcation of the liquid. Only after you can model these sections accurately by themselves should you consider combining them.

taissir June 12, 2013 10:33

obviously that's what I try to do. for the moment I do not work the thermal part. I hope to find help in this furum regarding the introduction of the metal as Drop. thank you for making me realize the complexity of the problem. this will allow me to set more reasonable limits for modeling.:)

ghorrocks June 12, 2013 18:23

I would also consider which software to use. CFX does not have a melting or solidifcation model, but I think fluent does and other codes do. It will be a tricky project in itself just to get this working in CFX. I would have a good look at other software to see if they already have models for the key physics you need to model this.


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