Incompressible Laminar-to-Turbulent Flow Transition Study, Chapter 2: Two-Dimensional Cases (Pre-Release)

Kurzfassung

This chapter describes the two-dimensional transitional flow cases considered within AVT-313; they include flat plate and airfoil profiles. Detailed overviews of the experimental data and set-up are given, followed by verification of the numerical solutions to estimate the numerical uncertainties. Finally, the experimental data is compared to the computed results for validation and conclusions regarding the two-dimensional cases are drawn. The main focus of the present exercise is the assessment of the consistency across the solutions obtained with different RANS solvers by using the same mathematical models, domain sizes, boundary conditions and grids. The verification of the results shows that differences in implementation of the turbulence or transition models may exist. Experimental data indicate that compared to fully turbulent computations, the use of a transition model improves the agreement. Particularly, the prediction of bypass transition is improved. For the airfoils, laminar separation bubbles are over-predicted due to very low turbulence levels at the leading edge of the foils.