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Modeling Laser ablation of Aluminum

Topics: 3.5a, Heat Transfer, Fluid Flow

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Sathish D

Sathish D

August 19, 2011 12:55pm UTC

Modeling Laser ablation of Aluminum

Hi everyone :)
I use comsol 3.5 to model laser ablation of Aluminum in the following stack - Aluminum/Silicon nitride/Silicon. How to couple the heat transfer equations to the ablation and melting of Aluminum? I would also need to model the recoil of molten Aluminum material. From the previous comsol conference papers, I got the all equations in hand.

But I have a doubt whether the coupling should be done by incorporating heat transfer module and Fluid mechanics module and substitute appropriate sub domain boundary conditions for each of the material or use ALE to model the moving liquid once aluminum has reached melting point? (I need to see how solid aluminum changes to liquid phase and moves due to laser ablation)
If I use two separate modules and use appropriate sub domain boundary conditions, would melting and molten aluminum flow be visualizable in post processing?


My another doubt is, the laser beam has Guassian power distribution and Aluminum would have specific reflectivity for the beam. how to account for these effects in the model? In the weak form? If so kindly explain.

Thanks in advance :)

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Huang simom

Huang simom

February 9, 2012 7:05am UTC in response to Sathish D

Re: Modeling Laser ablation of Aluminum

Hi, have you solved your problem?
the recoil pressure is relative to the surface temperature according to a famous equation.
there should be a ALE to present the moving boundary due to the material removal.
best wishes to you and your family.



Hi everyone :)
I use comsol 3.5 to model laser ablation of Aluminum in the following stack - Aluminum/Silicon nitride/Silicon. How to couple the heat transfer equations to the ablation and melting of Aluminum? I would also need to model the recoil of molten Aluminum material. From the previous comsol conference papers, I got the all equations in hand.

But I have a doubt whether the coupling should be done by incorporating heat transfer module and Fluid mechanics module and substitute appropriate sub domain boundary conditions for each of the material or use ALE to model the moving liquid once aluminum has reached melting point? (I need to see how solid aluminum changes to liquid phase and moves due to laser ablation)
If I use two separate modules and use appropriate sub domain boundary conditions, would melting and molten aluminum flow be visualizable in post processing?


My another doubt is, the laser beam has Guassian power distribution and Aluminum would have specific reflectivity for the beam. how to account for these effects in the model? In the weak form? If so kindly explain.

Thanks in advance :)


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