Abstract
This paper presents a model for calculating turbulent mixing and mass transport in high Schmidt number flows based on a Direct Numerical Simulation of the flow field and a solution of the filtered transport equation of the scalar field. We call this approach SEMI-DNS. It is shown that, in this strategy, the only term that needs to be modelled is the cross stress term C i = u ic′, which eases modelling of the unresolved scales of the scalar field considerably. An a-priori analysis of the DNS data of turbulent channel flow at Re τ = 180 and Sc = 3 and Sc = 10 shows that this term is small. Because of the quasi linearity of the scalar transport equation, the ADM model is applied for this term, and SEMI-DNS calculations are performed up to Sc = 1000. Comparisons with full DNS results up to Sc = 10 and global quantities from the literature up to Sc = 1000 show excellent agreement.
| Original language | English |
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| Pages | 823-828 |
| Number of pages | 6 |
| State | Published - 2005 |
| Event | 4th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 4 - Williamsburg, VA, United States Duration: 27 Jun 2005 → 29 Jun 2005 |
Conference
| Conference | 4th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 4 |
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| Country/Territory | United States |
| City | Williamsburg, VA |
| Period | 27/06/05 → 29/06/05 |