Date of Award

12-2017

Access Type

Thesis - Open Access

Degree Name

Master of Science in Aerospace Engineering

Department

Graduate Studies

Committee Chair

Dr. William Engblom

First Committee Member

Dr. John Ekaterinaris

Second Committee Member

Dr. Reda Mankbadi

Abstract

The objective of this thesis is to implement and evaluate a Synthetic Eddy Method (SEM) into the Eagle3D compressible ow solver. Both the ability of Eagle3D to resolve unsteady turbulent ow field and capability of the SEM to reproduce given Reynolds stress profiles to start realistic turbulent behavior are verified using common academic cases. Eagle3D is a Computational Fluid Dynamics (CFD) solver using a novel combination of a Bounded Central Differencing (BCD) scheme with Weighted Essentially Non-Oscillatory (WENO) approximation to reduce numerical dissipation. SEM is a modern synthetic turbulence method able to reproduce an arbitrary Reynolds stresses specification on discretionary geometries while keeping computational costs low. The Large-Eddy Simulation (LES) capability of Eagle3D is evaluated using the flow over a cylinder and compared to results by ANSYS Fluent. The SEM is used to reproduce unsteady inlet conditions for channel and at plate cases and relayed into Eagle3D. Common ow parameters such as skin friction, Reynolds stresses and velocity components are compared against analytic, Direct Numerical Simulation (DNS) and periodic LES to estimate the performance of this solver combination in accuracy and development length. Parametric studies of grid dependence, varying upstream Reynolds-Averaged Naiver-Stokes (RANS) data and prescribed eddy length scale are performed. Modifications to the SEM are prescribed and tested where suitable. Further studies and modifications to the SEM based on the obtained data are suggested.

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