[DanMorris1]

Hello all, I am trying to mesh an outlet surface from one fluid domain and the inlet surface of another fluid domain. Whenever I try a surface or volume mesh, one of the surfaces meshes well and the other stays as a non-meshed surface. Any ideas on how to fix this?

[aero_head]

I am having a hard time visualizing what is going on, could you please post an image of what is happening? Is this one mesh you've imported onto another one or two separate meshes or just one whole mesh?

[rsunil]

Hello everyone,

I searched for similar problems within the forum but I could not find any posted solutions. Hence, I am replying to this post.

I am meshing a 3D geometry of a multi-section wing in ICEM CFD for an external aerodynamics simulation. For the sake of confidentiality, I am not able to post the exact mesh. I hope the description would suffice, if not I will try to recreate the problem with a simple geometry.

Starting with the geometry, each section of the wing along the span is given a unique part name as they are different in geometry, (high-lift devices included like an actual aircraft wing) and helps in part based meshing. Each geometry section is individually imported into ICEM using the formatted point data.

I have cleaned the geometry to the best of my ability and I have built the topology and gotten red and blue curves. Since there are many elements in my geometry, I am not sure if everything is intact and watertight, some curves may have been deleted after building topology.

I set the global meshing parameters and the part based meshing parameters and applied, I applied the Volume meshing parameters as well (Octree Mesh). When I computed the Octree mesh (without prism layers), Only some surfaces (i.e. some parts/part names) are meshed while others are not meshed. Note that, I have created a body point within the domain. I have stumbled upon this problem even for a simple rectangular NACA0015 wing and ends up meshing within the airfoil cross section in contact with the symmetry plane when it is actually supposed to create a hole in the shape of the airfoil. I usually overcome this problem by doing everything from scratch, since I could not troubleshoot what the error could be.

I have not set the wing parts as an 'internal wall' in the part mesh.

My assumptions are that it has to do with the tolerance of the geometry or that I have not set the wing parts as an internal wall, since it has worked without enabling the option for most instances.

I am not sure of the exact reason of this problem and I would really appreciate if you could let me know the possibilities of such problems.

Sorry for the long description, I tried describing the problem as detailed as possible since I am not sure if I can recreate the problem for a simple case as I am not sure what is triggering the problem.

Thank you in advance

[mluckyw]

This is one of the reason I moved to hexahedral structured mesh. I also often encounter this problem whereas a surface is misrepresented or having holes even if the surface is perfect if I opened it in space claim. If the geometry is simple enough, I suggest to try structured mesh.