This work shows the application of Multi-fidelity Uncertainty Quantification to Wind
Engineering problems. As test case a rectangular shape is used, with a fillet radius, in order
to represent the geometrical variations that can affect buildings or other bluff bodies. The
rectangular cylinder used has a chord-to-thickness ratio 5:1. This rectangular shape is an
important basic shape for wind engineering tasks, e.g. in case of buildings or other bluff bodies
exposed to the flow. Moreover it is well investigated and documented.
Coarse and fine meshes are used as low and high fidelity models respectively. To perform
CFD simulations, the stabilized finite element methods are used in both the high and low fidelity
model with a CFD code developed by TUM and the International Center for Numerical Methods
in Engineering. The underlying UQ framework is based on a Sparse Arbitrary Moment Based
Algorithm (SAMBA) developed at ICL. In the formulation the number of simulations is reduced
using a Smolyak sparsity model.
The multi-fidelity extension, with application to wind engineering problems is discussed and
presented in this work. The overall goal of such formulation is to gain an accuracy of mixed lowhigh fidelity simulations comparable to the ones obtained with only high fidelity simulations, at
a fraction of the computational cost.