Reply To: the method to create external flow geometry with design modeler

[Dato]

Dear professor,

Your words-" Note that there won't be any flow here anyway because the walls are so close together and the no-slip condition of the viscous flow." really enlightened me. Do you means that the fluid wouldn't flow from one side to another side as the arrow shows physically? Sorry that I have not that much engineer experience.

I'm feeling so sorry that the model above is not my true one.Actually ,my simplified geometry is shown below.It's external flow across spiral rods that genuinely"touch" each other at a point in the axial direction. I am not sure at/near the touching point if the fluid will flow.  Today I have try many times and I found that I can successfully boolean this external flow field only when the remaining body you want to subtract  doesn't include "touching points" . But it still can't solve my problem because it's just simplified. Or can I add tiny body at touching points to merge the bodied?Is it reasonable to do this and consistent with actual physics?

PS:again express my sincere gratitude to you. It's so kind of you that really do me great help. Please forgive me because I'm not an English speaker so maybe I have some grammar mistakes and wrong expression which it's hard to understand.