Learning Forum

[Jian Liu]

I'm doing numerical simulations of laser selective melting, including: 1. the gas phase above; 2. the molten metal phase below. I have tried laser heat source acting between two phases, and there is a problem when dealing with steam backlash pressure, thank you for your advice!

1. Laser heat source power 200w, spot radius 40μm. Choose two sizes of models 0.12mmX0.2mmX0.25mm and 1.6mmX0.8mmX0.65mm, the difference between the two is only the difference in grid size (1μm/grid and 10μm/grid), otherwise using exactly the same settings and UDF compilation statements.

2. However, when the same temperature is reached, the former does not seem to have evaporation, while the evaporation depth of the latter (10μm/grid) is about 800nm.

The UDF of the recoil pressure and a schematic diagram are below.

I would appreciate any comments!

 

 

[Jian Liu]

The evaporation temperature is 3500K

[Jian Liu]

Normally, should the finer the mesh be the more accurate the calculation result, does it mean that the 10μm/mesh model is wrong? Thank you

[Rob]

How many cells are you adding the source term to in each case?  Rather than spreading questions over several threads keep them in one place?