UWG model simulation failed. FATAL ERROR! Try running a shorter simulation (for a fraction of the year) or try increasing the simulation timesteps per hour

ladybug-tools
1

I’m getting this error when trying to run UWG:

  1. Solution exception:The UWG failed to run:
    UWG model simulation failed.
    FATAL ERROR! Try running a shorter simulation (for a fraction of the year)
    or try increasing the simulation timesteps per hour.
    Error at 7/1 36300s
    T_INDOOR: 297.04999999999984C
    T_CEILING: 169.6955672320259C
    BEMDef,
    bldtype: midriseapartment
    builtera: pst80
    mass: MassFloor
    wall: SteelFrame
    roof: IEAD
    frac: 0.226.
    Traceback (most recent call last):
    File “C:\Program Files\ladybug_tools\python\lib\site-packages\uwg\cli\simulate.py”, line 50, in simulate_json_model
    uwg_model.simulate()
    File “C:\Program Files\ladybug_tools\python\lib\site-packages\uwg\uwg.py”, line 1353, in simulate
    self.UCM, self.UBL, self.BEM = urbflux(
    File “C:\Program Files\ladybug_tools\python\lib\site-packages\uwg\urbflux.py”, line 38, in urbflux
    BEM[j].building.BEMCalc(UCM, BEM[j], forc, parameter, simTime)
    File “C:\Program Files\ladybug_tools\python\lib\site-packages\uwg\building.py”, line 385, in BEMCalc
    raise Exception(
    Exception: FATAL ERROR! Try running a shorter simulation (for a fraction of the year)
    or try increasing the simulation timesteps per hour.
    Error at 7/1 36300s
    T_INDOOR: 297.04999999999984C
    T_CEILING: 169.6955672320259C
    BEMDef,
    bldtype: midriseapartment
    builtera: pst80
    mass: MassFloor
    wall: SteelFrame
    roof: IEAD
    frac: 0.226.

I started with this sample file I found in another post - and just added my own test geometry (in those red internalised geo components). It runs fine as is - with the original sample file’s geo attached:

uwg_example_PC1.gh (613.2 KB)

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image1920×767 132 KB

It also runs fine if I replace either of these bulding geometry inputs with my own - each of which is just a single box-shaped solid polysurface:

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image1780×679 170 KB

However, not when both are attached simultaneously:

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image841×752 66.3 KB

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image1492×800 211 KB

Same thing if I use the 2 original building geometry inputs but supply my own terrain geometry - which is just a flat rectangular plane. It fails with a very similar error message:

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image1167×693 170 KB

FYI: I’m on V1.8 - could this be a simple versioning issue? I can’t quickly change versions because I’d need to get IT involved - so checking first whether there’s another easy fix.