Abstract
In this paper, performance of several turbulence models is evaluated by computing the turbulent separated flow over a 2D bump using the RANS equations. The turbulence models considered are the Spalart-Allmaras (SA), SST k-ω, and Wray-Agarwal (WA) models. The geometry of the 2D bump is the centerline geometry of the NASA/Virginia Tech (VT) 3D BeVERLI hill bump. Since the experimental data is available only for the 3D bump, the goal of this paper is to compare the numerical solutions using the three turbulence models on a series of grids from coarse to fine. The experimental data of the 3D bump is also presented to evaluate the trends in the predicted pressure and velocity fields of the 2D bump. Three cases with three different freestream Reynolds numbers are computed. The surface pressure coefficients on the 2D bump and the velocity vectors are computed in the computational domain surrounding the 2D bump. The Wray-Agarwal model predicts results with similar trends as the 3D experimental data and gives results consistent with the other two models, which gives confidence in using the WA model for computing the turbulent separated flows. In addition, the WA model results show better agreement with the SST k-omega model results compared to the results from the Spalart-Allmaras model, which indicate good accuracy of the WA model. This paper presents an additional carefully generated test case for the turbulence modeling community for testing the turbulence models for turbulent separated flows.
Document Type
Final Report
Class Name
Mechanical Engineering and Material Sciences Independent Study
Date of Submission
12-11-2023
Recommended Citation
Qian, Xuehui, "Evaluation of Various Turbulence Models for Turbulent Separated Flow over a Model Two-dimensional Bump" (2023). Mechanical Engineering and Materials Science Independent Study. 255.
https://openscholarship.wustl.edu/mems500/255