I'm not completely familiar with the physics when it comes to micro and macro porosity defect. But, if I were to take a guess, it is caused by air / gas entrained when the alloy is solidifying. Because of this, I'm thinking you might have to enable the multiphase model here.
To get better clarity, please have a look at published literature on how to model this in Fluent. There are numerous publications in this area which use Fluent as the modeling tool
Hope this helps.
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