Multi-Direction Pedestrian Wind Comfort Analysis

Multi-Direction Pedestrian Wind Comfort Analysis

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  By Jon Wildeand Richard Szöke-Schuller CFD webinar New Feature: Multi-Direction Pedestrian Wind Comfort Analysis Utilizing Pacefish®
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  ● Why isthis important? ● How does the industry calculate this now? ● Why use CFD? Today’s application Multi-Direction Pedestrian Wind Comfort Analysis
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  What is a... LatticeBoltzmann simulation? ● Particle-based ‘mesh-less’ simulation ● Transient only ● Incompressible and isothermal ● Large-scale models 100s of millions of elements ● Runs purely on GPUs
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  Simulation setup Multi-Direction PedestrianWind Comfort Analysis How we set up these simulations in the SimScale Platform.
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  Define region Define windrose Define pedestrian zones 1 2 3 2 minute set up It’s that simple. 1. Define region 2. Define wind rose 3. Define pedestrian zones How simple can it be?
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  Step 1 ● Positionand size the cylindrical region of interest ● Define which direction is North Define city region
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  Step 2 ● Importwind rose or (soon) select global location and use SimScale’s data ● Choose engineering standard ● Define wind exposures Wind rose
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  Step 2 ● Importwind rose or (soon) select global location and use SimScale’s data ● Choose engineering standard ● Define wind exposures Wind rose
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  Step 3 ● Pedestrianregion ● Roof terrace ● Terrain offset Define pedestrian region
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  Results Multi-Direction Pedestrian WindComfort Analysis Findings, ROI, key learnings, and next steps Utilizing Pacefish®
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  ● ABL Profile ●8-36 directions ● Wind speedup factor ● Exposure correction factor ● Weibull distribution from the wind rose data ● Exceedance probabilities based on specific comfort criteria What’s going on behind the scenes? CFD Source: https://www.sciencedirect.com/science/article/pii/S0360132316300415 Exposure correction Wind Speedup (CFD / Wind Tunnel)
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  What’s going onbehind the scenes? ● ABL Profile ● 8-36 directions ● Wind speedup factor ● Exposure correction factor ● Weibull distribution from the wind rose data ● Exceedance probabilities based on specific comfort criteria CFD Weibull Distribution Source: https://wind-data.ch/tools/weibull.php?lng=en
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  Comfort criteria results Results LawsonDavenport NEN 8100
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  Transient results Results 0 deg90 deg 270 deg Utilizing Pacefish®
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  270 deg Transient results Results 0deg Utilizing Pacefish®
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  Design change Multi-Direction PedestrianWind Comfort Analysis Modifying the design and comparing results
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  What was changedin the design? Design Change Original Design Modified Design
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  Design Comparison -67.5deg Wind Direction Design Change Utilizing Pacefish® Original Design Modified Design
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  Live demonstration Multi-Direction PedestrianWind Comfort Analysis
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  Results with aterrain Results Lawson Utilizing Pacefish®
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  Results ● Run-times aretypically a few hours ● Quick insights into wind comfort ● Ability to make design decisions and compare results the same day Key learnings Utilizing Pacefish®
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  Multi-Direction Pedestrian Wind ComfortAnalysis CFD webinar Thank you!