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The Effect of Turbulence Modeling on Dynamic Urban Wind Simulation
Posted Wed March 15, 2017 @03:02PM
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Application Rheologic has posted a case study on the effects of turbulence modeling on dynamic urban wind simulation.

Wind in urban environments impacts on a number of issues from local microclimate, to energy use for heating and cooling, facility performance (HVAC), rents (arcades, outdoor dining areas) and in the future possibly UAV delivery routes. While steady-state simulations that cover the average wind velocity are very helpful, looking at the dynamic behaviour can sometimes be critical.

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Solver shootout: RANS vs. URANS vs. LES
Before we jump into more detailed explanations of the respective methods, take a minute to look at this short video showing a direct comparison of simulations using the same geometry and - mostly - identical boundary conditions. Watching the video will give a much more tangible impression of the difference between the methods (see below for a 3d animation of the URANS and LES).

Read the full case study.

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