Date of Award


Document Type


Degree Name

Master of Science in Aeronautical Engineering


Department of Aeronautics and Astronautics

First Advisor

Jeffrey R. Komives, PhD


The modeling focus on serpentine inlet ducts (S-duct), as with any inlet, is to quantify the total pressure recovery and ow distortion after the inlet, which directly impacts the performance of a turbine engine fed by the inlet. Accurate prediction of S-duct ow has yet to be achieved amongst the computational fluid dynamics (CFD) community to improve the reliance on modeling reducing costly testing. While direct numerical simulation of the turbulent ow in an S-duct is too cost prohibitive due to grid scaling with Reynolds number, wall-modeled large eddy simulation (WM-LES) serves as a tractable alternative. US3D, a hypersonic research CFD code developed by University of Minnesota was used with inviscid fluxes calculated using 4th order kinetic-energy consistent schemes by Subbareddy and Candler with a flux limiter by Ducro. The WM-LES model by Komives was applied with a constant Vreman sub grid scale model. The use of higher order numerical models on a fully structured grid were assessed with delayed detached eddy simulation (DDES) and WM-LES turbulence models to obtain increased prediction accuracy of the S-duct ow when compared to previous studies and test data. Further, a first of its kind dynamic Vreman model was derived, implemented, and validated in US3D using a flat plate model.

AFIT Designator


DTIC Accession Number