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June 2020

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Aremi MacDonald

FAQ – Wind Comfort Simulations by Ingrid Cloud [UPDATED 2020]

How do I prepare/set up my model for a simulation? What file formats can I use?

Step-by-step instructions for setting up your model can be found here.

 

Ingrid Cloud supports the following file formats: STL, STEP, IFCZIP, DXF, IGES, OBJ, LAS, 3DS, IFC, DWG, ASC.

 

Can I compare multiple designs for Wind Comfort analysis?

With our new Wind Score app (launching soon), users will be able to upload multiple design options and, based on the simulation results, Ingrid Cloud will rank the models in best and worse wind performance. The criteria used is mean wind speed where less wind acceleration is considered best, and stronger wind acceleration is worse.

ingrid-cloud-flow-simulations

 

  • Fast setup: upload and analyse anywhere from 2 to 12 different models.
  • Easy-to-read results: the score is based on the percentage of wind acceleration around an area of interest chosen by the user.
  • Understand Wind Effects: assess the wind dynamics around each model for in-depth analysis in the 3D Viewer.

 

Can I upload my own wind data?

Yes! As an alternative to the automatic geolocation-based wind data provided by meteoblueyou have the option to upload your own wind data in a .csv file format. The file size is virtually limitless, and some users are using the data to generate pedestrian comfort analysis with hourly and daily weather data from 20+ years.

 

How do I start a simulation using my Revit project?

Ingrid Cloud has an app for Revit, downloadable directly from the Autodesk app store here. With the Ingrid Cloud add-in, users can set up a simulation directly from their Revit project. No preparation of the model is needed. This saves you time in preparing the model, enabling users to integrate wind analysis directly into their Revit workflow.

Should you prefer, users also have the option to export a Revit project into any of the supported files and start a simulation in our browser-based platform.

 

What type of meshing technique is used?

Our numerical solver uses a Finite Element Method with an unstructured, tetrahedral mesh. Read more about our technology here

 

How is the mesh refined?

Our adaptive mesh refinement method is capable of identifying regions of the flow requiring higher resolution, depending on the quantity of interest specified in the creation of the simulation, and the residual (the sum of all local errors). Tetrahedra in these regions are subdivided into smaller tetrahedra, increasing the resolution and decreasing the local error. This subdivision continues until the error is sufficiently small throughout the entire domain.

mesh.jpg
Visualise the computational mesh of a simulation directly from the 3D Viewer. 

 

How is the boundary layer defined, and how is it applied to the ground surface/sides of buildings?

The governing equations we solve for simulating the wind are the time-dependent, incompressible Navier Stokes equations. As wall layer models for high Reynolds numbers such as air, we choose a shear stress model developed already in the 1970s (Schumann), and apply an implicit Large Eddy Simulation (LES) method based on mesh adaptivity and a posteriori error estimation to resolve the small scales of turbulent flow. For more details, see e.g. DOI: 10.1016/j.cma.2014.12.004

 

How is porous media e.g. trees and vegetation applied? Can it be defined?

Trees are currently not modelled in our simulations because porous media can negatively affect the accuracy of a wind simulation.

The City of London’s Wind Microclimate Guidelines recommends against modelling trees for wind simulations:

It is prudent to ignore landscape features in the baseline wind studies, especially when the landscape elements are smaller than 8m in height. Large mature trees can be included, but limited published guidance exists for modelling such landscape features, so care should be taken to provide appropriately conservative interpretation of their impacts.

Although this feature is not available in our standard product, should there be a requirement for trees, Ingrid Cloud will work with you to create a customised visualisation.

 

Do you have a free or academic version of Ingrid Cloud for students?

To maintain the quality and accuracy of our professional wind simulation solution, we currently do not offer a free version of Ingrid Cloud. However, we want to make sure our simulation services are accessible to anyone; therefore, we offer an 80% discount on all wind simulations for the purpose of academic research and to students enrolled at an academic institution.

 

If you have any burning questions 🔥 we didn’t answer in this post, feel free to send us a message!