Ryo Araya from the Environmental GIS Laboratory presents "Airflow Modeling in Urban Landscapes" at the 2011 GeoDesign Summit.
00:01 Hello everyone.
00:02 My name is Ryo Araya. I come from Japan.
00:04 I appreciate the opportunity to speak with you today about airflow modeling and GIS.
00:11 The movement of the air affects our livelihood in various ways such as strong wind, diffusion of smoke, or...
00:19 ...summer environment, and so it can be considered during the design process.
00:25 To visualize an invisible flow of wind gives a planner a useful knowledge for creating a wind-friendly design.
00:34 So in this presentation, I would like to briefly describe some application scenarios...
00:41 ...featuring integrated wind modeling technology with GIS.
00:47 Why do we want to integrate wind modeling into GIS, the geodesign process?
00:54 Traditional winds analysis using CFD technology was often outsourced and assessed after the design had been fixed.
01:03 It was difficult to change design based on analysis results.
01:09 Now we can integrate the evolving design in the GIS directly into wind simulation.
01:19 By simplifying the wind modeling experience, the planner can now operate simulation process by himself...
01:28 ...and optimize the plan by trial and error.
01:34 Visualizing the results in 2D or 3D with other plan design data can be very informative.
01:44 And finally, results can be used for further spatial analysis in the GIS.
01:52 We have developed an ArcGIS extension called the Airflow Analyst which integrate wind for modeling with ArcGIS.
02:01 This tool provides computational, mesh generation, wind simulation, and visualization integrated into ArcGIS.
02:11 LES, Large Eddy Simulation is mathematical model for turbulence.
02:19 One of the feature areas is output of time series wind view data...
02:25 ...which can be visualized as an easy-to-understand animation.
02:31 LES has a high accuracy and in the past year, the expert believe that it was too computationally intensive...
02:39 ...to be used as an engineering tool or a design tool.
02:44 This is no longer true.
02:46 Our model has been developed and validated in Kyushu University for more than 10 years...
02:52 ...and it can finish a simulation on general purpose PC within several hours.
03:00 And so I'd like to show you some case studies applying this software.
03:06 In the first case, we estimated strong winds generated along the high-rise building.
03:12 As you know, when a building restricts wind flow, strong wind is rised at the edge of the building.
03:20 By modifying the building shape, there is a possibility to mitigate the wind hazard.
03:27 In Japan, when high-rise building is planned near the low-rise houses.
03:32 The developer have to explain impact to surrounding neighborhood.
03:38 The lower right picture shows some typical way to ease strong wind.
03:47 The next case, we applied it to more complex environment structures.
03:53 This baseball stadium roof can be opened.
04:02 In this animation, you can see a strong wind generated along the both side of the building.
04:10 And some trees planted at the lower left was swayed in the downwind direction.
04:18 This means that strong wind constantly blows at this place when land and sea breeze happen.
04:28 The third case study is about placement of micro wind turbine on the rooftop.
04:37 It is known that high wind velocity of the rooftop height is as strong as at ground level.
04:44 However, there is a variable wind speed because complex turbine wind flow is reduced at the upwind building...
04:53 ...and edge of roof itself.
04:56 To take measurable wind condition is very important to find a suitable place for windmills.
05:07 The fourth case is application to the Japanese Environmental Building Assessment System called CASBEE.
05:15 If a building classified as the highest level in the system, then it is regarded as a more valuable property in the real estate market.
05:27 For the assessment, the designer prepares a proposed plan and results observation data for wind simulation.
05:37 By tracking the exhaust gas or heat released from house or car parking...
05:46 ...the designer can find out where uncomfortable airflow and human activities are connecting.
05:53 This kind of analysis and counter measures are required to perform a thermal environment assessment.
06:02 This method can also be applied to individual housing design.
06:11 To taking a comfortable breath from outside possibly, window location for flow of the air is important.
06:26 But it is hard to imagine its flow path without simulation.
06:31 This method was used in residential design competition to objectively explain the designer's intent with the wind environment.
06:45 The last case is an exploration of ventilation path in urban area.
06:51 This picture shows how ocean breeze flows into Fukuoka City.
06:56 Much of the simulation become possible by optimizing the calibration [unintelligible] by 64-bit computation.
07:05 You can see is a strong wind around the rivers and wide streets parallel to the wind direction.
07:14 Local government used this information to make planning decisions such as connecting the greenbelt...
07:21 ...or aligning building direction or height to ease heat island effect in summer.
07:29 These are some applications using wind modeling technology with Airflow Analyst.
07:35 If you have any questions on this presentation, please ask me later.
07:39 Thank you for kind attention.
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