3D Inflation mesh around tubes in other fluid domain
 

Hi,

I am working on a system having two fluid domain.

As shown two photos.

https://imageshack.com/i/p8dhfNHxp

https://imageshack.com/i/pbWuwIfqp

in outer tubes domain, other fluid domain is available and I would like to have boundary layer around tubes ( outer side).But I couldnt do that as you see 2 photos,

What should I do? Multizone, sweep? if it is so, what exactly should I do?

I have used inflation mesh in that part.and around circular ( around diameter of tubes) I have selected edge sizing but I have never seen that .

And another thing, (system has multi-part exported 3D cad programme) there is a cat-part on waste gas fluid domain.Face below cat part has boundary layer both around tubes and inner tubes.But contrary there is no way to see photos that I have uploded.

Kind Regards,