Inconsistent Energy Simulation Results After Restarting Rhino

grasshopper honeybee
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1

Hi all,

I am running a simple EUI energy simulation for an entire building and I’ve run into a problem: every time I restart Rhino&GH and rerun the simulation, I get different results. But if I do NOT restart Rhino and simply rerun the simulation, the result stays consistent.

For example, here are some results I got from two runs (after restarting Rhino and rerunning the simulations):

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This project has some complexity in the program and construction settings, but to demonstrate the issue I set everything to fixed values. So in theory, there shouldn’t be any room for inconsistencies…

It would be great if someone could help me out. Thanks in advance!

2

https://drive.google.com/drive/folders/1wNTNcj0BOjcLN62qmQ4HnYVESHSmCSu1?usp=sharing

Because my account is too new, I can’t upload files here directly, so I’ve placed them in a Google Drive folder. Thanks in advance.

3

There can be inconsistencies due to difference in warmup convergence, auto sizing differences due to the latter and there’s some other reasons but I can’t remember what they are.
I’ll take a look at the file when I get to my desk.
Best
-trevor

4

@Evelyn1 can you re-upload or send me the .3dm file saved as version 7, then I can look at it if you’d want
best
-trevor

5

@TrevorFedyna Thank you very much. I’ve also uploaded the v7 model in the same folder, it’s called model_Rhinov7.3dm.

1 Like
6

@Evelyn1 soooo I cant run the model due to some grasshopper v8 components but that’s okay.
Try this:
Run simulation 2 or 3 times to separate folders.
compare *.err file for stuff like “did not converge” or other warnings, if there are errors/warnings then that could be the cause of the different results.

Hopefully that helps! Sorry I couldn’t run your file!
the *.err is here on my machine: C:\lbt_files\example_dir\unnamed\openstudio\run->eplusout.err

best
-trevor