Ansari, Naseem
(2012)
Filtered Density Function for Large Eddy Simulation of Turbulent Reacting Flows on Unstructured Meshes.
Doctoral Dissertation, University of Pittsburgh.
(Unpublished)
Abstract
A new computational filtered density function (FDF) methodology is developed for large
eddy simulation (LES) of turbulent reacting flows on an unstructured mesh. The effect of
chemical reactions in the transport equation of FDF appears in a closed form, whereas the
effects of scalar mixing and convection within the subgrid are modeled. The FDF transport
equation is solved numerically by a particle based Lagrangian Monte Carlo (MC) method.
The base filtered transport equations on the unstructured mesh are solved by a finite-volume
(FV) method. The consistency of the hybrid FV-MC solver and the realizability of the
simulated results are demonstrated via LES of a temporally developing mixing layer. The
overall performance of the model is appraised by comparison with direct numerical simulation
(DNS) data. Subsequently, the unstructured FDF simulator is employed for predictions of
two swirl stabilized non-premixed flames. These are low-swirl (SM1) and high-swirl (SMA2)
methane flames. The simulated results are assessed via comparison with experimental data
and show excellent agreements. Finally, the unstructured FDF solver is extended to conduct
LES of a realistic swirl flame combustor. This is the PRECCINSTA experimental burner
from the German Aerospace Center (DLR). The simulated data are analyzed by comparison
of the Reynolds-averaged statistics with experimental data and show excellent agreements.
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Details
| Item Type: |
University of Pittsburgh ETD
|
| Status: |
Unpublished |
| Creators/Authors: |
|
| ETD Committee: |
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| Date: |
4 June 2012 |
| Date Type: |
Publication |
| Defense Date: |
29 March 2012 |
| Approval Date: |
4 June 2012 |
| Submission Date: |
30 March 2012 |
| Access Restriction: |
5 year -- Restrict access to University of Pittsburgh for a period of 5 years. |
| Number of Pages: |
86 |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
Swanson School of Engineering > Mechanical Engineering |
| Degree: |
PhD - Doctor of Philosophy |
| Thesis Type: |
Doctoral Dissertation |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
Large eddy simulation, filtered density function, turbulence, reacting flows. |
| Date Deposited: |
04 Jun 2012 20:14 |
| Last Modified: |
04 Jun 2017 05:15 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/11616 |
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