IES-VE User Forum

Hello guys!

Has anyone encountered problems when modelling typical floors? I was modelling typical floors by first doing one floor and then copy it (in front view) to form the succeeding floors. Before I copy the floor, I ran model check, and I got no errors. But when I copied the floor, and then ran model check again, I got unmatched adjacencies. Weird.

Thanks,

Xie

Hi,

Try running a rebuild on the model (ModelIT Settings menu >> Click Rebuild button).

If the problems are occurring between the newly copied rooms and the existing rooms then check that the room heights are correct and that when you copied you snapped to the grid, you might need to edit vertices to line these up again if the room heights are precise to a few decimal places then they may not be quite toughing.

If the problems are between rooms on the same floor then I would suggest they were always there.

A final solution might be to export the geometry as a GEM file then re-import it as many times as you want to add additional floors, often importing a gem file will flag up problems and in some cases can make the geometry more robust.

Phil

Hello.

I hope I can help. I have modeled a building, but alongside this there is another building that provides shade, draw this building and from the original building obstrucctions Attach file option and I get the next building with all the upper contour in yellow, then without I did nothing but run, but does not increase the burden of heat or cold, so I think I'm doing something wrong. Please tell me which way I go after loading the next building.

Thank you.

Edison B.

PCully wrote:Hi,

Try running a rebuild on the model (ModelIT Settings menu >> Click Rebuild button).

If the problems are occurring between the newly copied rooms and the existing rooms then check that the room heights are correct and that when you copied you snapped to the grid, you might need to edit vertices to line these up again if the room heights are precise to a few decimal places then they may not be quite toughing.

If the problems are between rooms on the same floor then I would suggest they were always there.

A final solution might be to export the geometry as a GEM file then re-import it as many times as you want to add additional floors, often importing a gem file will flag up problems and in some cases can make the geometry more robust.

Phil

Hi there Edison,

I wonder if this would have been better in a new topic rather than adding it as a response on this one?

Anyway I'll answer here this time.
When you attach the Obstructions then this should import the other building as a Local Shade (select one of the shading bodies in the room browser, right click and check Room Type to see this). Unless you are running SunCast and linking that shading file to the simulation then you won't see any effect from the shading bodies so I expect that is why you haven't seen any change.

Note: there is another Room Type option for Shading bodies called Adjacent Building this will have the same affect of shading the building you are analysing but also any adjacency where the two buildings touch will be treated as adiabatic rather than external air conditions. For some projects this is applicable but not sure if it describes your model or not.

Phil

Hi Phil,

Thanks for the response. I wonder if you have encountered this error message:

"Error: Instability in room B1. Possible remedies: reduce time step; set control radiant fraction to 0; check gain and ventilation levels; reduce Macroflo opening areas."

I did all the suggested remedies but I'm still getting the same error message. The model have several unmatched adjacencies. Could it be causing the problem?

Thank you very much!

Xye

Here's the usual stuff that should solve the problem

http://www2.iesve.com/Support/Knowledge ... sectionId=

If none of these seem to work then you might need to look at the zones that are reporting problems - does the instability occur in one of the rooms that is reporting unmatched adjacencies? I'd suggest you take a copy of the model and just delete the problematic rooms then see if the simulation runs, you can iterate this way to identify where the instability occurs and then review these rooms to try remove the problem - sometimes if it's just one or two rooms it's faster to redraw those rooms and we usually find this fixes any problems.

If you take care when drawing the model in future and try to snap to grid wherever possible then you should avoid problems like this further down the line and save yourself a lot of effort.

Phil

Hi Phil,

Thanks for the response. I've figured out the solution to the problem. I just have to change the building fabric u-values, as the instability occurs when there's too much heat gain in the room.

Thanks,

Xye