A hydrodynamic/acoustic splitting approach for the prediction of combustion induced noise
Abstract/Contents
- Abstract
- In this thesis a hydrodynamic/acoustic splitting approach is proposed to study combustion noise. In this splitting, two simulations are solved simultaneously. A large eddy simulation of the low-Mach number equations provides a solution of the hydrodynamic motions of the flow (base-flow), while a set of perturbed equations is additionally solved for to capture the acoustic motions. A rigorous derivation of these perturbed equations for the assumed base-flow is given. This derivation accounts for additional terms related to variable-density flows that do not appear in the corresponding non-reacting equations. The scope is limited to low-Mach number flows and to linear acoustics, so that information is only transferred from the base-flow to the acoustic simulation. Different numerical implementations of the base-flow and the perturbed equations are outlined, namely a pressure-projection method and a developed density-based solver. In contrast to the low-order finite difference code employed for the discretization of the base-flow equations, a high-order compact finite difference implementation is used for the perturbed equations. For this set of equations, non-reflective characteristics-based boundary conditions are also derived. In order to test the proposed methodology, several verification and validation cases are considered, and an outlook to application cases is given in the end. Throughout the presentation of these simulations an emphasis is placed on highlighting the differences in various forms of the perturbed equations as well as effects caused by the two numerical implementations of the base-flow equations.
Description
| Type of resource | text |
|---|---|
| Form | electronic; electronic resource; remote |
| Extent | 1 online resource. |
| Publication date | 2013 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Associated with | Schmitt, Christoph |
|---|---|
| Associated with | Stanford University, Department of Mechanical Engineering. |
| Primary advisor | Pitsch, Heinz |
| Thesis advisor | Pitsch, Heinz |
| Thesis advisor | Ihme, Matthias |
| Thesis advisor | Lele, Sanjiva K. (Sanjiva Keshava), 1958- |
| Advisor | Ihme, Matthias |
| Advisor | Lele, Sanjiva K. (Sanjiva Keshava), 1958- |
Subjects
| Genre | Theses |
|---|
Bibliographic information
| Statement of responsibility | Christoph Schmitt. |
|---|---|
| Note | Submitted to the Department of Mechanical Engineering. |
| Thesis | Thesis (Ph.D.)--Stanford University, 2013. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2013 by Christoph Schmitt
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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