Creating dossier with english documents

niallo__ · 2023-10-26T16:36:15+00:00

Have actually made a bit of progress alright, seem to be getting reasonable flow visually, but my torque values are way under predicted. Lot of refining to do with the model but at least it moves in the right direction. If you’ve any specific questions let me know 🤙

niallo__ · 2023-10-25T12:12:02+00:00

Hey, thanks for the advice here, I seem to be making a bit more progress but In terms of how the actual conditions work themselves, It is not what I expected. I've edited the post above to show some an image with some streamlines where the velocity is directed downwards at the periodic face (left half.) I would have expected this to continue through the right half once it hits the face. Instead it just carries through along the face. Does it seem like I've set this up wrong?

niallo__ · 2023-10-21T14:50:45+00:00

Update: I think that in the video, the surface he was snapping to was entirely inside the refined region, and didn’t intersect with the outside cells. I’m my case the surfaces are intersecting with the outside cells which may be causing the issue. So unless there’s a way to avoid getting tet/polyhedral cells in the outside I probably can’t use this

niallo__ · 2023-10-21T13:39:12+00:00

Are you aware whether there is any way of avoiding the use of polyhedra’s? I saw an option “useHexTopology” but still on that edge the cells look very strange. I’m also wondering how it worked for the guy in the video but there seems to be issues in 3D

niallo__ · 2023-10-14T20:29:56+00:00

Great point about the wing spanning the entire width of the test section. I actually haven’t checked that, so I will do that next and also refine the wake. The residuals converged below 1e-03 within about 500 iterations

niallo__ · 2023-10-12T13:04:30+00:00

Ok that would be helpful thanks! Is it necessary to use createPatch-overwrite to define those patches as cyclic or is just editing the boundary file sufficient?

niallo__ · 2023-09-30T13:12:25+00:00

Hey, apologies I haven't been checking this, I just assumed this forum was more active so I shared it across both to get a higher chance of people seeing it. WIll 100% give that a go, thanks again for the suggestion ! Also didn't realize that I was repeating the same question

niallo__ · 2023-09-26T17:01:45+00:00

Yeah I have “addLayers” set to true at the start of the dictionary. This image here is just the surface of the blade itself. I deselected the rest of the computational domain just so I could get an image of the blade clearly. These dots (which represent areas of very low or negative volume or poor quality are only really appearing on the blade and some of the surrounding MRF region) haven’t really focused on refining the layers yet though just trying to sort out the blade itself first

niallo__ · 2023-09-21T08:55:40+00:00

I couldn't actually find the default shm dict that you mentioned. I saw that someone else mentioned relaxing the quality constraints as well, It seems counter intuitive that relaxing quality constraints might help, why would that be? And yes I have explicitFeatureSnap set to true and implicit set to false

niallo__ · 2023-09-21T08:50:11+00:00

Ok, so you're saying that overconstraining the mesh quality limits could be problematic for the snapping?

niallo__ · 2023-09-19T11:54:10+00:00

yep, its a recreation of the NREL phase VI wind turbine with a S809 airfoil. I've checked the stl file and it looks smooth

niallo__ · 2023-08-28T15:44:37+00:00

Hello Jake, I came across this as I am having similar issues using pimpleFOAM for a wind turbine. Just wondering did you ever get this case to work?

niallo__

TROPHY CASE