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Realistic Domain Size

Question asked by Abdulrahman Alrumaidh on Jul 7, 2015

If I set the computational domain exactly fit to the model, will the analysis be less realistic? from the results I am getting (external flow) I think the flow bounded inside the domain only. when the flow projectiles bump to the domain wall from the inside they will bounce off again into the domain. I think this is not the case in real conditions. In short, how should I set the domain size to get a realistic analysis?