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# How to Use CFD and FEA Together To Solve Industrial Design Dilemmas

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Learn how to use CFD and FEA simulation together to optimize building designs before construction. This slide deck and webinar focus on using a combination of Natural Frequency Analysis and Vortex Shedding to determine design faults, and how to improve and optimize for quicker results.

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Veröffentlicht in: Ingenieurwesen
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### How to Use CFD and FEA Together To Solve Industrial Design Dilemmas

1. 1. APPLICATIONS OF CFD & FEA IN THE CONSTRUCTION INDUSTRY JON WILDE
2. 2. ACCELERATE YOUR DESIGN PROCESS Easily test performance, optimize durability or improve design efficiency with cloud-based simulation.
3. 3. ALL-IN-ONE Structural mechanics, fluid dynamics, and thermodynamics. REAL-TIME SUPPORT Chat, phone, and email. Consultancy, webinars, and training. COLLABORATION Join the community, benefit from public projects, and share knowledge. FAST & EASY Get results faster on any device thanks to cloud technology. COST-EFFICIENT Start risk-free without an upfront investment. SECURE High security with government-approved Advanced Encryption Standard (AES).
4. 4. BUILDING STRUCTURE – CFD AND MODAL FREQUENCY ANALYSIS ● Question 1 ○ What are the modal frequencies of the main structure? ● Question 2 ○ How does the flow move around the building and could the wind loads excite the structure? 80m
5. 5. WHAT IS A NATURAL FREQUENCY? ● Everything vibrates and has resonant frequencies ● Some frequencies can cause parts to ‘sing’. This is a natural frequency ● A good example is a guitar string ○ Here we want vibration to occur ● If we understand the vibration, we can dampen it
6. 6. WHAT IS NATURAL FREQUENCY? ● Everything vibrates and has resonant frequencies ● Some frequencies can cause parts to ‘sing’. This is a natural frequency ● A good example is a guitar string ○ Here we want vibration to occur ● If we understand the vibration, we can dampen it ○ This dog seems to have it handled
7. 7. WHY DOES IT MATTER? ● Here is one example why we need to know the natural frequencies of a structure ○ They can be… nasty (Source: https://giphy.com/gifs/cinemagraphs-bridge-tacoma-duatwzNErHFKw)
8. 8. PART 1: MODAL FREQUENCY ANALYSIS
9. 9. HOW TO GET STARTED 1. CAD IMPORT Upload your CAD model or import it from other cloud services into SimScale. 2. SIMULATION SETUP All steps to define and run a simulation are done within SimScale. 3 3. DESIGN DECISION Use simulation insights to make better and faster design decisions.
10. 10. SIMULATION SETUP – NATURAL FREQUENCY ANALYSIS Load Bearing Structure of the Building Floors Columns ● Structural skeleton of the building consists of ○ 30 floors at 2.5m intervals ○ 8 columns across the entire length ○ 80m total height
11. 11. SIMULATION SETUP – NATURAL FREQUENCY ANALYSIS Fixed Support Material ● Concrete: Entire structure Boundary Conditions: ● Fixed Support: Bottom faces of the columns
12. 12. RESULTS – NATURAL FREQUENCIES OF THE BUILDING Mode Frequency 1 0.209739 2 0.218836 3 0.299477 4 0.65987 5 0.679429 6 0.906195 7 1.19709 8 1.22184 9 1.53931 10 1.73041
13. 13. RESULTS – NATURAL FREQUENCIES OF THE BUILDING Mode Frequency 1 0.209739 2 0.218836 3 0.299477 4 0.65987 5 0.679429 6 0.906195 7 1.19709 8 1.22184 9 1.53931 10 1.73041
14. 14. RESULTS – NATURAL FREQUENCIES OF THE BUILDING Eigenmode-1 0.209 Hz Eigenmode-2 0.2188 Hz Eigenmode-3 0.29944 Hz Eigenmode-4 0.6598 Hz
15. 15. PART 2: VORTEX SHEDDING ANALYSIS
16. 16. SIMULATION SETUP – VORTEX SHEDDING ANALYSIS ● Inlet ○ Velocity inlet profile (maximum velocity of 36.6m/s at 37m from ground) ● Outlet ○ Pressure outlet ● Side walls ○ Slip (no friction) Pressure Outlet Velocity Profile
17. 17. VORTEX FREQUENCY AT DIFFERENT WIND DIRECTIONS 3 Case 1 Wind in x direction Case 2 Wind at 45 degrees Case 3 Wind at 90 degrees
18. 18. WIND LOAD ANALYSIS ● SimScale will predict the vortex shedding frequencies for each wind direction ● Once extracted, we will compare these frequencies with the modes from the previous analysis
19. 19. RESULTS – CFD Analysis Force in Y direction Oscillations due to vortex shedding
20. 20. DIRECTION 1 – VORTEX SHEDDING
21. 21. DIRECTION 2 – VORTEX SHEDDING
22. 22. DIRECTION 3 – VORTEX SHEDDING
23. 23. DIRECTION 1 – VORTEX SHEDDING
24. 24. RESULTS – CASE I Vortex shedding on a vertical plane
25. 25. RESULTS – CFD vs FREQUENCY RESPONSE Modal Frequencies (FEA) Mode Frequency 1 0.209739 2 0.218836 3 0.299477 4 0.65987 5 0.679429 6 0.906195 7 1.19709 8 1.22184 9 1.53931 10 1.73041 11 1.76 12 2.2 13 2.3 14 2.35 15 2.9 CFD Analysis Flow Direction Force Frequency x 1.9 x 2.1 x 2.9 45 0.6 45 2 90 2.2 90 2.6 90 2.6
26. 26. CONCLUSION ● There are two modal frequencies that cross over with the transient wind loads ○ Internal change ■ Damping ■ Re-design ○ External change ■ Modify building shape