Non-Boussinesq simulations of turbulent convective flows at supercritical pressure
Flows at supercritical pressure conditions exhibit strong variations of fluid properties which occur locally in a narrow temperature range. Because of these variations, the linear Boussinesq approximation is a strong simplification for this type of flows. In this paper, a Reynolds Averaged Navier-Stokes (RANS) method, based on the non-Boussinesq formulation of the transport equations, is developed and applied to investigate turbulent forced convection in supercritical CO2. Using this method, two simulations of turbulent heat transfer in vertical tube are performed. In both cases the inlet boundary conditions are created in a separate computational domain, called inflow-generator. In this manner the inlet boundary conditions are independent of experimental or Direct Numerical Simulation (DNS) reference data. In the first investigation, the profiles at the inlet are created using an isothermal RANS inflow generator. In the second analysis, the initial profiles are generated using the results of a separate isothermal Large Eddy Simulation (LES). The LES inflow-generator may considerable increase the computational effort of the entire simulation. However, the more accurate inlet profile provided by this method induces a faster convergence of the simulation in the heated domain. The results of both simulations show a good agreement as compared to the DNS results by Bae et al. 1.
Supercritical pressure forced convection RANS
Claus Kunik Ivan Otic Thomas Schulenberg
Karlsruhe Institute of Technology Institute for Nuclear and Energy Technologies Hermann-von-Helmholtz-Platz 1 76344 Eggestein-Leopoldshafen
国际会议
上海
英文
1236-1247
2010-10-10（万方平台首次上网日期，不代表论文的发表时间）