[Loorsa]

Hi all, i hope this is the right place where to ask help for this problem.
I'm a mech. eng. student and my master's thesis is on a cooling system.
I'm using fluent to analyze a thin fluid exchanger and the mesh is causing lots and lots of problems.
In the pic below you can se one of the errors the mesher does on the fluid domain.
The fluid domain has spiralitic boundaries, generated with somehow high order splines in cad.
I tried nearly every option but the mesher doesn't end up in a successful mesh.
I use a multizone, prism (no free) method, a general sizing and a bias on some edges perpendicular to the main face; the method is not sweep because there's the exchanger wall imprinting inlet and outlets on a face, the circle where the stretched elements start is an outlet.
I just tried suppressing the refinement imposed on the in/outlets and the mesh seems to be ok, even if it gives me the error: "The following entities with objects scoped to them were unable to have mesh data correctly associated with them. Try removing the object scoped to these entities or try another mesh method to get a successful mesh.".

Any suggestion? The graduation is in a month from now and i've been stuck here for 5 days, not being able to get a successful mesh even with some old functioning settings.
The entire geometry has been recreated transferring some profiles from invetor to solidworks, since every body is a simple extrusion.

pleas halp

[Loorsa]

ok i figured out that the mesh sizing on the fluid domain was "disturbed" by the sizing on the wall, belonging to the same part (the interface is conformal tho).
Now, if i suppress the wall sizing, generate the fluid mesh, unsuppress the wall sizing and generate the wall mesh everything end up fine.
How can i avoid this "interaction"?
The wall is an extrusion of the fluid domain except for some thin lines (needed to have thermal continuity in the wall) so their sizing is low respect to the fluid.
I'm sorry not to provide more images and explanations but i need to maintain some discretion on the system.