Direct Numerical Simulation of Turbulent Katabatic Slope Flows with an Immersed-Boundary Method
| Autor: | Rey DeLeon, Clancy Umphrey, Inanc Senocak |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Atmospheric Science
Katabatic wind 010504 meteorology & atmospheric sciences Turbulence Prandtl number Direct numerical simulation Laminar flow Mechanics Immersed boundary method 01 natural sciences 010305 fluids & plasmas Physics::Fluid Dynamics symbols.namesake Classical mechanics Incompressible flow 0103 physical sciences symbols Boundary value problem Geology 0105 earth and related environmental sciences |
| Zdroj: | Boundary-Layer Meteorology. 164:367-382 |
| ISSN: | 1573-1472 0006-8314 |
| DOI: | 10.1007/s10546-017-0252-3 |
| Popis: | We investigate a Cartesian-mesh immersed-boundary formulation within an incompressible flow solver to simulate laminar and turbulent katabatic slope flows. As a proof-of-concept study, we consider four different immersed-boundary reconstruction schemes for imposing a Neumann-type boundary condition on the buoyancy field. Prandtl’s laminar solution is used to demonstrate the second-order accuracy of the numerical solutions globally. Direct numerical simulation of a turbulent katabatic flow is then performed to investigate the applicability of the proposed schemes in the turbulent regime by analyzing both first- and second-order statistics of turbulence. First-order statistics show that turbulent katabatic flow simulations are noticeably sensitive to the specifics of the immersed-boundary formulation. We find that reconstruction schemes that work well in the laminar regime may not perform as well when applied to a turbulent regime. Our proposed immersed-boundary reconstruction scheme agrees closely with the terrain-fitted reference solutions in both flow regimes. |
| Databáze: | OpenAIRE |
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