[Sam Phillips]

Hi,

I am attempting to refine a part of my mesh of an S-Duct diffuser in Pointwise, specifically the inlet. I selected the relevant domain and used the Grid -> Solve menu to edit the domain mesh using the refine button as well as changing the boundary decay value. However, after making these changes the block that is associated with this domain becomes undefined with 0 cells.

Could anyone tell me how to fix this issue and re-define the block. I am a new user of Pointwise and am editing a mesh provided to me by someone else, so I apologise in advance if this is an easy fix.

Thank you in advance for your help.
Sam

[dgarlisch]

Not enough information.

Please read this

[Sam Phillips]

Hi David,

My apologies for the lack of information. Here is some more detail:

I am using a hybrid mesh of an S-Duct diffuser in Pointwise V18.3. I am looking to refine a particular part of the mesh, the inlet, as I have discovered I have some non-orthogonal cells there. My end goal is to export the mesh to OpenFOAM and I am aware that OpenFOAM is not very tolerant of non-orthogonality. The inlet consists of an unstructured mesh. I selected the relevant domain No. 48 (see picture below) and used the Grid -> Solve menu in Pointwise to edit the mesh. I made two changes to the mesh, firstly I changed the boundary decay from 0.5 to 0.7 in the Attributes panel, and then I hit the Refine button twice in the Solve panel. After clicking the Initialize button these actions refined the mesh, however when I went to select my blocks for export blk-3 which corresponds to the inlet is now undefined, (see picture below) and hence I cannot export the mesh. My question is whether I can stop blk-3 from becoming undefined, or how I go about re-defining blk-3 so that I can export my new mesh.

Additionally, here is the link to the Pointwise project file on Dropbox: https://www.dropbox.com/s/pk1i7wjht8...20Edit.pw?dl=0

Please let me know if any extra information is required.
Thanks for your help.
Sam

[tcarrigan]

Hi Sam,

Looking that block in the list panel shows that it is a prism block. Prism blocks are, by definition, created via the extrude tool in Pointwise. If you change one of the boundaries of a prism block they become undefined. You'll have to re-extrude from the desired face to regenerate the block.

If you have questions about how best to do this, please feel free to reach out to Engineering Services at support@pointwise.com using your customer ID (starts with PWI) and they can help you out.

Best regards,
Travis

[Sam Phillips]

Hi Travis,

Thanks for your reply, the information you provided me with was very helpful. I did as you recommended and have been in touch with Pointwise support. They recommended that I re-extrude my block using path extrusion by selecting a path connector from one of my connectors. I have watched the video on path extrusion on Pointwise's Youtube channel, however I'm a little unsure how to proceed as the domain I have refined is situated between two blocks (see pictures below). Could you provide me with any more detail on how I would go about re-extruding this domain and what connector I should select as the path connector?

Many thanks for your help.
Sam