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Documentation

How To Make A Revit Model Ready For Pedestrian Wind Comfort Analysis Using SimScale?

There is an increase in the use of CFD validations, especially for Architectural designs from Revit. Therefore, it is important to know how to prepare Revit models to run a Pedestrian Wind Comfort Analysis (PWC). Read more about how to bring in Revit models to SimScale below.

SimScale provides a dedicated and easy to setup module for Pedestrian Wind Comfort Analysis. More about the Pacefish®\(^1\) PWC analysis using SimScale, can be found here.

Objective

This article revolves around the workflow on how to open Revit files and define the scope of the model. This way we can ensure to create a valid CFD-ready model from Revit.

Revit to SimScale Workflow

To explain the workflow, a detailed house geometry from Revit takes as an example:

revit model simscale
Figure 1: Example Revit Model

By default, Revit opens a model in the Structural plans mode. The 3D view can be accessed using View –> 3D as shown in the image below.

3d view revit workbench
Figure 2: A 3D representation of the model as visualised in Revit Workbench

Cleaning the Model for External Wind Analysis

Generally, Revit models come with a lot of details. But for an efficient external CFD analysis, some of the details/components are not necessary. This section shows how to identify them in the model and hence, defining the final scope of the model.

To browse through the components present in the model, Visibility Graphics can be used. To access the same select ‘View –> Visibility / Graphics’ as shown below:

visibility graphics
Figure 3: The Visibility Graphics (VG) in Revit displays the list of components/families included in the project.

An external wind analysis would need only the basic components which define the shape and topography of the building (s) to be analyzed. Hence, it is encouraged to check the elements or parts necessary for the analysis.

Here is a list of important items necessary for a CFD simulation:

  • Ceilings
  • Columns
  • Curtain panel, Curtain system
  • Walls
  • Topography
  • Floors
  • Masses
  • Roofs
  • Site

Except for the above-mentioned items/groups, other items can be turned off. To make this effective in the 3D viewer, press ‘Apply’.

Best Practice

For external wind analysis, we won’t need the furnitures, pipes, fittings, duct accesssories, electrical equipments, door bells, safety systems, wires, etc. In general, things which are relatively smaller in dimensions (<0.5 \(m\)) are not encouraged.

Cleaning up the Revit model
Figure 4: The detailed architectural model might contain a variety of unnecessary details that need to be removed.
Wind Analysis ready model from Revit
Figure 5: The clean model which is suitable for the analysis is ready for import.

To know more about general CAD requirements for External Wind analysis check the following article:

Last updated: August 18th, 2021

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