Lecture Objectives LES Multizone modeling.

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Presentation transcript:

Lecture Objectives LES Multizone modeling

Examples of LES: https://www.youtube.com/watch?v=yRSoilRCuEs https://www.youtube.com/watch?v=y1sSRXFBN7k https://www.youtube.com/watch?v=dWe3fnfo9WQ https://www.youtube.com/watch?v=e1TbkLIDWys https://www.youtube.com/watch?v=iJIRrk7tKws https://www.youtube.com/watch?v=NClfGdfwWTA https://www.youtube.com/watch?v=hz7UjN_vYuw

LES vs RANS RANS: LES: Low pass filter – resolve large scale eddies Model effect of small scale eddies Cut-off scale ∆ (space grid), cut of time scale ∆

LES Similar to RANS we are using effective viscosity for LES: Gradient of velocity tensor: is the rate-of-strain tensor for the resolved scale Finally: This is SubGrid Scale (SGS) model Smagorinsky model (1963) eddy viscosity is model So no additional transport equation! There are Many more: Algebraic Dynamic model Dynamic Global-Coefficient model Localized Dynamic model

LES Time Step Depends on the length scale and velocity Courant–Friedrichs–Lewy (CFL) number condition for convergence while solving hyperbolic differential equations

Multizone modeling CONTAM 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