Unsteady Simulations of the Flow in a Channel Flow and a Ventilated Room Using the SST-SAS Model

Lars Davidson, Peter V. Nielsen

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Abstract

The SAS model (Scale Adapted Simulation) was invented by Menter and his co-workers. The idea behind the SST-SAS model is to add an additional production term - the SAS term - in the w equation which is sensitive to resolved (i.e. unsteady) fluctuations. In regions where the flow is on the limit of going unsteady, the object of the SAS term is to increase w. The result is that k and vt are reduced so that the dissipating (damping) effect of the turbulent viscosity on the resolved fluctuations is reduced, thereby promoting the momentum equations to switch from steady to unsteady mode.

The SST-SAS model is evaluated for two flows: developing channel flow and the flow in a three-dimensional ventilated room. Unsteady inlet boundary conditions are prescribed in both cases by superimposing isotropic synthetic fluctuations on a steady inlet boundary velocity profile.
Original languageEnglish
Place of PublicationAalborg
PublisherDepartment of Civil Engineering, Aalborg University
Number of pages19
Publication statusPublished - 2006
SeriesDCE Technical reports
Number4

Keywords

  • SAS
  • SST
  • Scale Adapted Simulation
  • Fluctuations
  • Unsteady Flow
  • Channel Flow

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