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Lecture Objectives

Lecture Objectives. Discuss HW4 Convergence issues Learn about “false time step” relaxation Multizone modeling Review class material. Multizone modeling. Example. Multizone modeling. CONTAM and COMIS http://www.bfrl.nist.gov/IAQanalysis/ NO momentum equation

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Lecture Objectives

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  1. Lecture Objectives • Discuss HW4 • Convergence issues • Learn about “false time step” relaxation • Multizone modeling • Review class material

  2. Multizone modeling

  3. Example

  4. Multizone modeling CONTAM and COMIS • http://www.bfrl.nist.gov/IAQanalysis/ • NO momentum equation • Just pressure, temperature, and continuity • Depends heavily on boundary condition and orifice coefficients that define flow between zones • Good for buoyancy driven flow

  5. Boundary condition for multizone modeling • Exterior pressure (wind) • Temperature distribution (requires some assumption or energy modeling)

  6. Wind pressurearound building Very complex and unsteady For multizone we are introducing many simplifications: ….

  7. Multizone vs. Moltizonla • “Multizonal” is like CFD (detailed grid with no orifice between i- between zones) but no momentum equation

  8. Commercial: Fluent (Airpak) www.fluent.com/ Star CD https://mdx.plm.automation.siemens.com/ Ansys CFX http://www.ansys.com/Products/Fluids/ANSYS-Fluent Phoenics www.cham.co.uk/ Flomerics (Flowvent) www.flomerics.com/ and many other Some free research: OpenFOAM https://www.openfoam.com/ NIST FDS and Smokeview www.fire.nist.gov/fds/download/ ASHRAE - zero equation (published only source code) Many more CFD software

  9. Summary of Course Objectives • Recognize the physics behind various numerical tools used for solving airflow problems. • Employ basic numerical methods for solving Navier-Stokes Equations. • Apply CFD for airflow simulations in buildings and use these tools in design and research. • Evaluate the thermal comfort and indoor air quality (IAQ) with different ventilation systems. • Assess human exposure to different pollutant types. • Critically analyze and evaluate CFD results.

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