Convection in a room through pipes

Saad Jamal

I want to see the air flow pattern, which is heated by pipes arrangement at the bottom. There is a inlet point for pipe inlet, which divides into two extensions. These pipes go along the walls and rejoin at a point which is inline with the initial point but it is near to the back wall.

Problems which im facing are;

Q(1): what should i do, to achieve smooth meshing. Meshing is creating problems near the pipe faces.

Q(2) : How to simplify this geometry

regards;

Saad Jamal