IGG connecting multiple blocks to a common interface for Volute meshing

Question

Hi everyone! I am a beginner attempting to mesh a volute in IGG. The cad is seen in image 1. I have also split the CADs surfaces further to attempt to make the blocking process easier 
 
 Image 2 below shows an upclose region near the cutwater. At this section, it seemed appropriate to split the mesh into two parts: A and B, extrude them separately and then set full non matching boundary conditions on the patch where they have a common interface. 
 
 I tried to extrude the portion of the face B seen below in image 3. 
 
 The portion A of the face was then extruded separately in image 4: 
 
 The two extrusions next to each other are in image 5: 
 
 The last image is my attempt at first trying to split the circular extruded section A into a patch near the common interface of B. Then setting the two patches between A & B's extrusion to full non matching. 
 
 I would like to know if the above process may be incorrect, or if there is a more suitable way of approaching this problem. I have tried to use methods from the IGG tut 3&4 to tackle the problem but would appreciate a second opinion.

Colinda · Accepted Answer

Hi Joseph, Based on these images I am wondering whether the patches on the two sides of the full non-matching connection are on a common surface at the location where they should be connected? I suspect that using the extrusion method that is not the case. When computing the full non-matching connection you'll probably see both sides will be treated as a solid wall. Or the space in between the patches is so small that it will treat it as a full non-matching connection but it introduces errors. 
 Best regards, Colinda

domen · Answer

I would split the domain into three parts, then use interfaces (FNMB in Igg's lingo) to connect the three regions. 
 1 outlet conical geometry 
 2 around the tongue 
 3 scroll 
 
 At the tongue, we would use something like a "C" configuration. Two blocks follow the tongue, other two are placed at the throat. 
 If you place well your blocks and grid points, the two sides of the interface will be slightly different mesh-wise, nothing that Fine Turbo can't deal with. 
 This configuration will work well once you begin to refine the mesh along the boundaries. Anyway, it's quite a lot of work. If an unstructured mesh is possible, it's definitely a no-brainer.

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IGG connecting multiple blocks to a common interface for Volute meshing

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