fds
fds copied to clipboard
firemodels
GEOM/PART nominal equivalence
@marcosvanella Looks like the small GEOM is not getting picked up by the initialization algorithm.
What is your idea here? The geometry does not cross any grid plane, can't build cut-cells with it through the intersection algorithm. We could define a special cut-cell with regular faces and the internal cfaces. There would be no momentum transfer through stresses. Or we could define a particle with the geometry properties.
How is it done with obstacles?
From: Randy McDermott @.> Sent: Friday, January 6, 2023 01:27 PM To: firemodels/fds @.> Cc: marcosvanella @.>; Mention @.> Subject: [firemodels/fds] GEOM/PART nominal equivalence (Issue #11304)
@marcosvanellahttps://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fmarcosvanella&data=05%7C01%7C%7C1f16c922d0c3495f0f4508daf013a765%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C638086264445502482%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=aPQxfCdNV9vRqNtll2htQEVAPTGB4DyZYO8ypFoYL5k%3D&reserved=0 Looks like the small GEOM is not getting picked up by the initialization algorithm.
— Reply to this email directly, view it on GitHubhttps://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Ffiremodels%2Ffds%2Fissues%2F11304&data=05%7C01%7C%7C1f16c922d0c3495f0f4508daf013a765%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C638086264445502482%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=vn4yOYgkrx4mJBH%2B8FyswSKxx8Y7uEBMhL6VzjDsQDw%3D&reserved=0, or unsubscribehttps://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fnotifications%2Funsubscribe-auth%2FABY23VP7GJYZWG3MNLJ5PK3WRBPYVANCNFSM6AAAAAATTKZG5U&data=05%7C01%7C%7C1f16c922d0c3495f0f4508daf013a765%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C638086264445502482%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=IwQ1EQsguMVn%2FMesnVdxNbwHG7Fm1rmqd6DCLRnbGTA%3D&reserved=0. You are receiving this because you were mentioned.Message ID: @.***>
Revisted this case and added a third mesh where the GEOM sits over an intersection with .9 of each geom dimension biased to one corner of the intersection (73 % of the GEOM is in one cell) In the third mesh we now see the effect of the geom. Not idenitcal to the particle since the particle is in one cell and the GEOM is in eight plus the heat transfer coefficient isn't going to be the same.
A way around this is to define geometries smaller than a grid cell size as particles such that we can use ht and drag laws, or otherwise block the cell where they are located as an option.
I'll work on this. I think we can use the correct HTC correlations for small geoms.
@drjfloyd Let's use "Milestones" instead of "Labels" for FDS 7.0 issues. Thanks