Learning Forum

[Dubey92]

Hi!! I am trying to model laser cladding in FLUENT. I have designed the system (shown in the image below). It consists of a base substrate surrounded by an inert gas atmosphere from above.

The metal deposition will take place over the substrate as the laser creates a melt pool. The continuity equation has an additional mass source term as shown in the image below:

As I understand, the mass source term will be added under cell zone conditions by changing phase to metal where options for mass source term comes. Please correct me if I am wrong.

Next,  I need to deposit metal in the form of powder. This is done through injecting powder using DPM as given in the excerpt taken from a published result.

How to add this source term for the force? Do I use DEFINE_SOURCE or DEFINE_DPM_SOURCE? 

Any help is much appreciated. Thanks

[Rob]

Are you melting the solid using a UDF or are you using the solidification/melting model? What are the droplets doing? Ie are the droplets a result of spray from the melt pool or from somewhere else? 

[Dubey92]

 

Hi Rob, thanks for your reply. I am melting the solid using a laser (UDF for energy source term and solidification/melting model). Now, I want to add a mass source of the same material. One thing I have understood is that I do not need to add the force terms separately. FLUENT automatically takes care of that.

I just need to add a mass source term in the continuity equation. Can you please tell how to add that? I am unable to understand where to add DEFINE_SOURCE

The droplets fall into the melt pool and solidifiy thus creating a solid layer. As written in the paper, the droplets are inject over the melt pool. I tried using DEFINE_DPM_SOURCE but unable to add a deposit over the solid.

Kindly revert.

Thanks.