SimScale Demo and Discussion on External AEC
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The document discusses pedestrian wind comfort (PWC) simulations using lattice Boltzmann methods (LBM). It provides an overview of PWC and how wind conditions around buildings can affect pedestrian comfort. A demonstration is shown of a PWC simulation of a 300m x 300m area of Bristol, UK using detailed geometry from AccuCities. The key steps of setting up a PWC simulation in SimScale are discussed, including defining the region, wind rose, and pedestrian zones. Results are presented on wind comfort categories and how to assess wind speeds and effects like downwash, channeling, and corner acceleration. Examples of public PWC projects on SimScale are also listed.
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SimScale Demo and Discussion on External AEC
- 1. External Building Aerodynamics: Pedestrian Wind Comfort January 2021 SimScale Demo and Discussion
- 2. 2 Agenda 1. Intro to Pedestrian Wind Comfort (PWC) 2. Intro to LBM and PWC 3. Demonstration 4. Setting up a PWC Simulation in SimScale 5. Key Results
- 3. Intro to Pedestrian Wind Comfort (PWC) Technical Presentation
- 4. ● Pedestrian Wind Comfort (PWC) is the name given to analyzing comfort around an urban area on a pedestrian due to the effects of wind. ● The buildings we design can drastically affect this comfort where many wind interactions with buildings can cause windy conditions at pedestrian-level height. ● CFD can be used to assess these effects, and SimScale has automated this process to make it as easy as possible, whilst maintaining many controls required to cater to a variety of scenarios. Intro to PWC 4 Pedestrian Comfort - Bristol
- 5. Intro to LBM and the PWC Analysis Type Technical Presentation
- 6. 6 LBM Technology Benefits Accurate Enables massive scale combined with sophisticated turbulence modeling. Robust Handles dirty or very detailed CAD gracefully, no explicit CAD clean-up required. Automated CFD best practices, Wind data and Guidelines incorporated into a highly automated workflow Pedestrian Wind Comfort analysis on the City of London - high fidelity CAD model for several square miles Fast GPU implementation for extremely quick turnaround times, unlimited parallelization through cloud computing
- 7. 7 LBM Technology Benefits Accurate Enables massive scale combined with sophisticated turbulence modeling. Robust Handles dirty or very detailed CAD gracefully, no explicit CAD clean-up required. Automated CFD best practices, Wind data and Guidelines incorporated into a highly automated workflow Simple 3-step process for a full Pedestrian Wind Comfort Analysis Define Region 1 Specify Pedestrian Zones 3 Select Wind Rose 2 Fast GPU implementation for extremely quick turnaround times, unlimited parallelization through cloud computing
- 8. 8 Accurate Enables massive scale combined with sophisticated turbulence modeling. Fast GPU implementation for extremely quick turnaround times, unlimited parallelization through cloud computing Robust Handles dirty or very detailed CAD gracefully, no explicit CAD clean-up required. Automated CFD best practices, Wind data and Guidelines incorporated into a highly automated workflow Validation Example: AIJ Case E, comparison of wind speedup factors to Wind Tunnel Experiments Pearson Coeff r = 0.86 LBM Technology Benefits
- 9. 9 LBM Technology Benefits Accurate Enables massive scale combined with sophisticated turbulence modeling. Robust Handles dirty or very detailed CAD gracefully, no explicit CAD clean-up required. Automated CFD best practices, Wind data and Guidelines incorporated into a highly automated workflow Detailed study of the City of London: 50 million cells, 8 wind directions, total runtime: 1h 55min Fast GPU implementation for extremely quick turnaround times, unlimited parallelization through cloud computing
- 11. Small city section from AccuCities ● Location: Bristol, north corner of Castle Park ● 300mx300m block modelled ● High detail model with topology, terrain, trees, and detailed buildings. ● Main objective: ○ To show the Pedestrian Wind Comfort (PWC) in the city area. ○ To show how highly detailed geometries from AccuCities are a great fit for the PWC workflow. Demo Overview Pedestrian Comfort - Bristol 11 Map showing location of a City Block in Bristol. Google Earth, earth.google.com/web/.
- 12. ● AccuCities provides geometries of many major UK cities including London, Birmingham, and Bristol. ● Geometry is available on a tile-by-tile basis, where several sample models are available. ● This sample was kindly provided and distributed under the Creative Commons Attribution-ShareAlike (CC BY SA) license ● Geometry from AccuCities can be readily used with the SimScale platform and its PWC/LBM solver. Geometry Overview Pedestrian Comfort - Bristol 12
- 14. 14 Region of interest from Accucities.com An extension was added to bring the topology to intersect with the wind tunnel. Geometry Setup - Rhino Workflow
- 16. 16 Define Region Define Wind Rose Define Pedestrian Zones 1 3 2 Minute Setup It’s that simple. 1. Define region 2. Define wind rose 3. Define pedestrian zones How simple can it be? 2
- 18. ● Wind comfort and wind safety determine if a space is suitable for certain activities, this could be sitting, standing or walking. ● Lawson LDDC takes into account the wind speed, probability of exceedance (from a wind rose), and predefined categories to make this assessment. Wind Comfort Probability of exceedance Velocity bins Most casual activity that is deemed comfortable to perform Simulation prepared geometry 18
- 19. ● To determine why a given space might be uncomfortable for certain activities, we can look at wind speeds in some predominant directions. ● This allows us to see what wind effects are generated, and how they could be mitigated. ● Examples include; Downwash, Channeling, and Corner Acceleration. Assess Wind Speeds Downwash Corner Effect Channeling Effect Tall buildings draw fast air from up high down to pedestrian level. Sharp building corners will see velocity increase as flow separates. Channels between close buildings increase velocity as it passes between them. Correlating wind speed to the comfort criteria 19
- 20. ● The SimScale has a large user base where public projects are being created every day. ● Here is a pick of the top public projects to test PWC. ● Many more projects are available searching for the tag ‘Pedestrian Wind Comfort’ Public Projects Vessel, Hudson Yard Urban Development Bristol 1 2 3 Pedestrian wind comfort around an urban sculpture. This project explores the effect of adding trees as mitigation, with simple geometry. The Bristol Demo case is a small detailed Example. Trees 20
- 21. Public Projects Hotel Case Study Trees in the Urban Landscape Extreme Topology in PwC analysis 4 5 6 Assessing different Hotel designs for pedestrian comfort. An investigation into the effect of trees in the analysis of PwC. A rural area in Bad Goisern, Austria, assessing PwC with Mountains ● The SimScale has a large user base where public projects are being created every day. ● Here is a pick of the top public projects to test PWC. ● Many more projects are available searching for the tag ‘Pedestrian Wind Comfort’ 21
Editor's Notes
- Stick to the script there is a lot of text, that is important
- Stick to the script there is a lot of text, that is important
- Stick to the script there is a lot of text, that is important
- Stick to the script there is a lot of text, that is important
- Stick to the script there is a lot of text, that is important
- Talk about how we will demo PWC using an off the shelf demo project, feel free to pick some info off the slides. Emphasis on the comparison on the right, here we see an extraordinary similarity between real life and CAD.
- Talk about AccuCities, Collaboration and how detailed their models are, mention a wide variety of cities available.
- Talk about the region of interest, extending the topology, and that by extending it the prevention of flow under the surfaces is made possible. The diagram top right shows the job of the extension, by intersecting the wind tunnel boundaries.
- Talk about the speed of setting the simulation up, its a 3 part process, don't dwell on the details
- Focus on what the results mean, activities, what are they, give example if not done so in demo, in the blue area in the middle say people might want to be sitting outside eating, as its a restaurant (example). Don't dwell too much on the velocity bins and probabilities, if you need to just mention there are several variations of the comfort map, and also different standards such as NEN8100 and Davenport.
- This page focuses on wind results, velocities, and correlating bad comfort for some activities to wind speeds. The main task is to identify downwash, cornering and channeling, and therefore can identify mitigation if needed.
- These slides are not part of the presentation, however, users may click on the links when they get a pdf of the slides to navigate to some of the public project I have identified as key project, covering a variety of scenarios.
- These slides are not part of the presentation, however, users may click on the links when they get a pdf of the slides to navigate to some of the public project I have identified as key project, covering a variety of scenarios.