Portfolio
Bolund Island¶
1. Project Description¶
The objective of this project is to reproduce the wind flow properties over the Bolund Island, as measured on-site by [1]. One convective time scale is defined as \(CTS = H / U_H\), where \(H =\) 12 meters is the nominal height of the island.
The island positioned at the computational domain has the geometry:
And probes are positioned over the island for velocity measurement:
The wind directions chosen to be simulated were:
Wind direction |
270.0 \(^\circ\) |
255.0 \(^\circ\) |
239.0 \(^\circ\) |
2. Simulation Setup¶
The Synthetic Eddy Method (SEM) boundary condition is applied at the inlet of the computational domain. Since it is a category 0 terrain, no fins were necessary to be distributed over the floor.
The domain of interest is at resolution level \(lvl\,4\) of the digital wind tunnel:
A 1:2 refinement ratio is estabilished between levels, and the simulation parameters at grid \(lvl\,4\) were:
\(\boldsymbol{\Delta x/B}\) (spatial resolution) |
6.25e-02 |
\(\boldsymbol{\Delta t/CTS}\) (temporal resolution) |
3.17e-03 |
exports/\(\boldsymbol{CTS}\) (pressure acquisition frequency) |
1.00e+01 |
\(\boldsymbol{T/CTS}\) (statistical sample size) |
4.55e+02 |
\(\boldsymbol{Re_{H}=U_{H}H/\nu}\) |
3.80e+04 |
The equivalent parameters in full scale are:
\(\boldsymbol{\Delta x[m]}\) |
0.75 |
\(\boldsymbol{\Delta t[ms]}\) |
3.30 |
\(\boldsymbol{f[Hz]}\) |
9.59 |
\(\boldsymbol{T[s]}\) |
475.00 |
The computational resources required were:
Device |
NVIDIA RTX A5500 |
NVIDIA RTX A5500 |
NVIDIA RTX A5500 |
Wind direction |
270.0 \(^\circ\) |
255.0 \(^\circ\) |
239.0 \(^\circ\) |
Node count (million) |
103.62 |
107.29 |
107.31 |
Allocated memory (Gb) |
13.36 |
13.82 |
13.82 |
Ellapsed time (h) |
6.33 |
6.45 |
6.29 |
3. Inflow¶
The inflow is taken from a measurement at M0.
4. Results: Velocity and Turbulence Profiles¶
Mean velocity and turbulence intensity profiles are measuread at different points for each wind direction chosen and compared against experimental data.
Mean Longitudinal Velocity¶
Execution Notes¶
Execution Date (YYYY-MM-DD) |
2024-11-23 |
Solver Version |
1.6.2 |
Changelog¶
30 Jan 2025: Updated results.
26 April 2024: Uploaded point comparisons, simulations executed with Nassu release v1.5.4.