Workflow logic: Eddy 3D + Ladybug for outdoor UTCI

ladybug-tools
1

Greetings,

I was wondering if anyone before has used Eddy 3D as an input to simulate outdoor thermal comfort? I am working on a GH setup that should optimize courtyard dimensions to accelerate wind and increase shading to improve thermal comfort for outdoor and indoor. I am using:

  • LB incident radiation (geometry: courtyard walls and floor, context: the whole house) to surface temperatures.
    -LB human to Sky relation (with LB generate point grid connected to courtyard walls and floor)
  • and Eddy 3D where I am using the wind factor annual as an input to UTCI wind velocity.

Screenshot 2025-11-27 213128
Screenshot 2025-11-27 2131281733×701 153 KB

Does this count as a valid approx for calculating the impact of courtyard dimensions on UTCI? would greatly appropriate your help.

2

Hey,
You can use UTCI comfort map component to calculate the solar radiation and input the air speeds via submitting a csv file. You can find examples of the wind inputs on this forum.
Cheers

3

Thanks Dimtry, I know we can do that via using an excel sheet or a direct input from epw file. But here in this case, I am testing different courtyard dimensions impact on wind velocity/ air speed through Eddy 3D, would that be a valid approach?

4

You can view this thread

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5

Thank you @Asisnath for suggesting this link.

But the question from @noura2586 may not be answered through that approach.

I recommend the following articles. While the first one discusses the gap in data exchange between BEM and CFD-based Urban Microclimate Modeling (UMM) tools, the second one outlines a way forward to input near-surface resolution microclimate data from CFD-based UMM in BEM (bypassing EPW).

  1. Urban Microclimate and Energy Modeling: A Review of Integration Approaches
  2. Simulating Tree Cooling Effects on Building Energy Performance: An Integrated Microclimate-Driven Approach

The two-way data exchange between CFD-based UMM and BEM tools (called coupling) is crucial to account both building indoor and outdoor impacts simultaneously. Due to high computational costs of CFD-based UMM tools, it is challenging to perform.

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