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April 2019

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Luma Bendini

What are high fidelity Wind Simulations?

Are you considering hiring a consultant to run a wind simulation? Good! Performing a wind study is an excellent way of understanding how the wind affects a building and an urban area, and how the building affects the wind. Here are some useful tips from the Ingrid Cloud team.

First, remember to ask for a high-fidelity simulation. You need high-fidelity to notice and understand many important wind effects, such as turbulence and wind gusts.

RANS vs. LES model

Simply put, computational simulation is to use a computer to solve the mathematical problem of fluid flow. Simulating in a digital environment that happens in real life is a useful feature in many industries nowadays! And to do so, there are many different methods. 


This video shows two of them. What you see are identical turbulent flow conditions solved with two different solvers or with different models.

The first one describes the average wind field called Reynolds-averaged Navier-Stokes (RANS) or low-fidelity simulation. It requires a relatively small amount of computational power and it’s often the most cost-effective way to run a CFD-simulation.

The second one shows in detail the vortices and the turbulence behaviour over time. This method is called Large Eddy Simulation (LES) and is also referred to as a high-fidelity simulation.

Not every software solution uses sufficient computational power to run a high-fidelity simulation. However, LES is the only one that captures the complex scenario that the wind forms in an urban area. So, in this particular case, LES is definitely MORE! At least when using Ingrid Cloud. 

When you hire a wind simulation consultant, make sure you tell him to use Ingrid Cloud - the fast and affordable way to run accurate high-fidelity simulations.