🔥 ANSYS Meshing Course – Session 7 | Body of Influence (BOI) for CFD Mastery 🚀

#BodyOfInfluence #ANSYSMeshing #ANSYSTutorial

⚡ Welcome to *Session 7* of the ANSYS Meshing Masterclass!
In this critical lesson, we unlock the power of the *Body of Influence (BOI)* — the secret to placing high‑quality mesh exactly where complex physics happens, even in empty fluid space.

By the end of this session, you'll master:
✅ Creating BOIs in 2D and 3D cases
✅ Refining wake regions behind airfoils & vehicles
✅ Controlling mesh density without modifying CAD geometry
✅ Reducing computational cost while capturing critical flow details

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⏱ TIMELINE:
00:00 Why key CFD physics often happens in empty space
00:07 Problem: no geometry to click for meshing
00:38 Introduction to Body of Influence (BOI)
01:02 Recap of previous sessions & the need for BOI
01:09 Example: wake region behind a car
01:23 Physics in CFD often away from body
01:47 BOI defined: virtual box, sphere, cylinder, etc.
02:02 Practical examples: 2D airfoil & 3D Ahmed body
02:31 Starting 2D airfoil case in ANSYS Meshing
03:12 Initial mesh setup, inflation layers, cell sizes
04:24 Why local sizing fails in empty regions
04:31 Switching to DesignModeler for BOI geometry
04:35 Creating independent BOI surface on XY plane
04:49 Dimensioning the BOI zone
05:02 Returning to Meshing & applying BOI sizing
07:00 Reviewing fine mesh in wake region
07:50 Transition to 3D example: Ahmed body
08:06 BOI in 3D: volumetric zone instead of surface
08:30 Creating rectangular BOI volume in DesignModeler
08:44 Extruding with "Add Frozen" to keep it separate
08:55 Applying BOI sizing (1 cm) in Meshing
09:20 Reviewing refined mesh around Ahmed body
09:45 Conclusion & emphasis on BOI’s importance in CFD

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▶️ *Previous Sessions:*
📹 *[Session 1 – Introduction to Mesh](   • ANSYS Meshing Free Course - Session 1: Int...  
📹 *[Session 2 – All Mesh Types](   • ANSYS Meshing Free Course - Session 2: All...  
📹 *[Session 3 – Global Mesh Controls](   • ANSYS Meshing Free Course - Session 3: Glo...  
📹 *[Session 4 - Mesh Methods (Part I)](   • ANSYS Meshing Free Course - Session 4: Mes...  
📹 *[Session 5 – Sweep, Cartesian & Multi-Zone Explained! (Part II)](   • 🔥 ANSYS Meshing Course - Session 5 | Sweep...  )*
📹 *[Session 6 – Local Sizing, Sphere of Influence & Bias Control](   • 🔥 ANSYS Meshing Course – Session 6 | Local...  )*



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