E3S Web of Conferences
Volume 5, 20152nd Symposium on OpenFOAM® in Wind Energy
|Number of page(s)||7|
|Section||Other Topics Including Meshing, Algorithms, Post-Processing, Parallel Performance|
|Published online||16 October 2015|
RANS Modeling of Stably Stratified Turbulent Boundary Layer Flows in OpenFOAM®
Department of Civil and Environmental Engineering, Colorado State University, Fort Collins, CO 80523-1372, USA
a Corresponding author: firstname.lastname@example.org
b Current affiliation: Department of Mechanical Engineering, Lipscomb University, 1 University Park Drive, Nashville, TN 37204, USA
Quantifying mixing processes relating to the transport of heat, momentum, and scalar quantities of stably stratified turbulent geophysical flows remains a substantial task. In a stably stratified flow, such as the stable atmospheric boundary layer (SABL), buoyancy forces have a significant impact on the flow characteristics. This study investigates constant and stability-dependent turbulent Prandtl number (Prt) formulations linking the turbulent viscosity (νt) and diffusivity (κt) for modeling applications of boundary layer flows. Numerical simulations of plane Couette flow and pressure-driven channel flow are performed using the Reynolds-averaged Navier-Stokes (RANS) framework with the standard k-ε turbulence model. Results are compared with DNS data to evaluate model efficacy for predicting mean velocity and density fields. In channel flow simulations, a Prandtl number formulation for wall-bounded flows is introduced to alleviate overmixing of the mean density field. This research reveals that appropriate specification of Prt can improve predictions of stably stratified turbulent boundary layer flows.
© Owned by the authors, published by EDP Sciences, 2015
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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