3. Onshore and Offshore Wind Resource and Energy Production Assessments using RIAM-COMPACT CFD Model

What is the RIAM-COMPACT?
Research Institute for Applied Mechanics, Kyushu University, COMputational Prediction of Airflow over Complex Terrain (RIAM-COMPACT) is a numerical-CFD-model/software-package which has an object domain from several m to several km, and can predict the airflow and the gas diffusion over complex terrain with high precision.

Features of the RIAM-COMPACT
- Non-linear/unstable CFD modeling
- Employing Large-Eddy Simulation (LES) technique instead of RANS for more realistic analysis
- Can be linked with Geographic Information System (GIS) to analyze flow over any complex terrain from all over the world
- 3D animation output of wind speed, turbulence intensity and more
- Possible to calculate annual energy output and load factor for given location based on real data
- Time sliced data output option to calculate wind load for given wind turbines
- Capable to display wind speed distribution and vertical profile of turbulence intensity at given location
- Wind direction (horizontal and vertical) with respect to wind turbine surface can be also produced

Also we use experiments and field observations together with the numerical simulations for prediction of wind systems and micro-siting over local topographic features.

Download recent works here:
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Simulation of a comlex terrain (top) and corresponding wind tunnel experiment (bottom)

数値計算 数値計算
Example of simulation parameter settings and results

Example of Miyake-island case

Simulation and visualization of wind system over Miyake island
Mount Oyama of Miyake island is volcanic and had erupted several times in the past. In year 2000, the volcano began series of eruptions. By September 2000, the island was completely evacuated and the evacuation lasted for four years. Although residents were allowed to return to the island on February, 2005, there has been a constant flow of sulfuric gas coming from Mount Oyama. We provided a set of simulations of volcanic gas emission from the island and diffusion by using our Thermally Stratified Wind Tunnel (TSWT) upon request from TV documentary program "Houdou tokushu" about the residents' brief return to the island, aired on TBS. Miniature model of the island was set in the TSWT's stable stratified airflow and Lee waves were created. With this setting, the flow and diffusion of volcanic gas running down along the mountain's surface was well simulated and visualized.

A set of numerical simulations of Miyake island's volcanic smoke flow was provided for TV program "News10" aired on NHK. The aired simulation was with nutral air flow and stability. We have also created simulations with a vriety of air flow and stability settings. This study has enabled us to predict volcanic gas/smoke flow with different stable stratified flow conditions.

More story to come soon!

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