Abstract
The understanding of air-flow in enclosed spaces plays a key role to designing ventilation systems and indoor environment. The computational fluid dynamics aspects dictate that the large eddy simulation (LES) offers a subtle means to analyze complex flows with recirculation and streamline curvature effects, providing more robust and accurate details than those of Reynolds-averaged Navier–Stokes simulations. This work assesses the performance of two zero-equation sub-grid scale models: the Rahman–Agarwal–Siikonen–Taghinia (RAST) model with a single grid-filter and the dynamic Smagorinsky model with grid-filter and test-filter scales. This in turn allows a cross-comparison of the effect of two different LES methods in simulating indoor air-flows with forced and mixed (natural + forced) convection. A better performance against experiments is indicated with the RAST model in wall-bounded non-equilibrium indoor air-flows; this is due to its sensitivity toward both the shear and vorticity parameters.
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Abbreviations
- \(C_\mu\) :
-
Eddy-viscosity coefficient
- \(\bar{C}_s\) :
-
Smagorinsky coefficient
- G :
-
Filter function
- g :
-
Gravitational acceleration
- k :
-
Total turbulent kinetic energy
- \(L_{ij}\) :
-
Leonard stress
- Pr :
-
Molecular Prandtl number
- \(Pr_{sgs}\) :
-
Sub-grid scale Prandtl number
- Re :
-
Reynolds number
- \(\bar{S}_{ij}\) :
-
Resolved strain-rate tensor
- T :
-
Temperature
- \(\bar{u}_i\) :
-
Grid-filter velocities
- \(\tilde{\bar{u}}_i\) :
-
Test-filter velocities
- \(\bar{u}_\tau\) :
-
Friction velocity
- \(\overline{W}_{ij}\) :
-
Resolved vorticity tensor
- \(y^+\) :
-
Dimensionless wall distance \((\bar{u}_\tau y/\nu )\)
- \(\beta\) :
-
Thermal expansion coefficient
- \(\delta _{i,j}\) :
-
Kronecker’s delta
- \(\varDelta t\) :
-
Time step
- \(\bar{\varDelta }\) :
-
Grid-filter width
- \(\tilde{\varDelta }\) :
-
Test-filter width
- \(\nu ,\nu _T\) :
-
Laminar and turbulent viscosities
- \(\bar{\theta }_i\) :
-
Grid-filter temperature
- \(\tilde{\bar{\theta }}_i\) :
-
Test-filter temperature
- \(\rho\) :
-
Density
- \(\tau _{i,j}\) :
-
Sub-grid scale stress tensor
- CFD:
-
Computational fluid dynamics
- DSM:
-
Dynamic Smagorinsky model
- LES:
-
Large eddy simulation
- RANS:
-
Reynolds averaged Navier–Stokes
- RAST:
-
Rahman–Agarwal–Siikonen–Taghinia
- SGS:
-
Sub-grid scale
- i, j :
-
Variable numbers
- in :
-
Inlet condition
- out :
-
Outlet condition
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Taghinia, J., Rahman, M.M. & Tse, T.K. Assessment of zero-equation SGS models for simulating indoor environment. Heat Mass Transfer 52, 2781–2794 (2016). https://doi.org/10.1007/s00231-016-1776-7
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DOI: https://doi.org/10.1007/s00231-016-1776-7