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Sökning: db:Swepub > Högskolan i Gävle > Fritt online > Moshfegh Bahram > (2011)

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1.
  • Chen, Huijuan, et al. (författare)
  • Comparing k-ε models on predictions of an impinging jet for ventilation of an office room
  • 2011
  • Ingår i: Roomvent 2011. - tapir academic press. - 9788251928120
  • Konferensbidrag (refereegranskat)abstract
    • The objective of this study is to compare the performance of different k-ε models, i.e. the Standard k-ε, the Renormalization Group (RNG) k-ε, and the Realizable k-ε, with a two-layer model for the prediction of the mean velocity field and the temperature pattern from a newly designed impinging jet supply device for ventilation of an office room. The numerical predictions are validated against the detailed experimental measurements.The experimental investigation was performed in a test room with the dimensions 4.2×3.6×2.5 m, as a mock-up of a single-person office. Detailed velocity and temperature field measurements including the comfort zone and the jet developing region along the floor were carried out. The in-house made single-sensor hot-wire probe and the thermocouple are measuring instruments used to investigate the mean velocity, turbulence intensity and temperature. The boundary conditions for Computational Fluid Dynamics (CFD) study are obtained from the same set-up measurement.The results mainly consist of the flow field presentation, i.e., the velocity and temperature profiles in the comfort zone and the jet developing region along the floor. The comparisons between the results from the three versions of the k-ε models and measurements show generally satisfactory agreement, and better consistency is observed at the free jet region and the wall jet region that farther from the impingement zone. Among the three tested turbulence models, RNG shows the best overall performance.
2.
  • Ghahremanian, Shahriar, 1974-, et al. (författare)
  • Numerical and experimental verification of initial, transitional and turbulent regions of free turbulent round jet
  • 2011
  • Konferensbidrag (refereegranskat)abstract
    • Three-dimensional simulation of the whole domain (initial, transition and fully developed regions) of round jet is essential in order to predict and to study the flow behavior of multiple jets (e.g. confluent jets). According to authors knowledge, numerical prediction of round jet with RANS models that has been presented by other researchers, are only in two-dimensional (axisymmetric) and mostly for the fully developed region. The inlet boundary conditions,  inlet velocity profile, turbulent kinetic energy and its dissipation rate at the diffuser exit has been governed from an earlier verified numerical simulation. In the present paper, results of three-dimensional modeling of isothermal, free, turbulent round jet with two two-equation (Low Re  and SST ), a transition three-equation ( ) and a transition four-equation (SST) eddy-viscosity turbulence models with resolved inlet profiles are compared and validated with hot-wire anemometry. This study shows that numerical simulation of round jet with SST  gives good agreement with measured mean longitudinal velocities, while transition models could only predict the initial region of round jet.
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  • Resultat 1-2 av 2
Åtkomst
Typ av publikation
konferensbidrag (2)
Typ av innehåll
refereegranskat (2)
Författare/redaktör
Chen, Huijuan, (1)
Ghahremanian, Shahri ... (1)
Moshfegh, Bahram, 19 ... (1)
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Engelska (2)
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