Advances in structure-based modeling of turbulent flows
Abstract/Contents
- Abstract
- Structure-based modeling, introduced by Kassinos and Reynolds (1995), uses one-point tensors to provide a more detailed description of the turbulent fluctuations. This thesis describes further developments to two structure-based models, namely the Algebraic Structure-based Model (ASBM), which belongs to the RANS category, and the Interacting Particle Representation Model (IPRM), which can been interpreted as a PDF model. The ASBM is an engineering model of turbulence for wall-bounded flows. A new variant of the model has been formulated, which exhibits (1) a segregated near-wall correction that leads to a new paradigm for model development and comparison, (2) a set of fully-explicit equations that replaces the original formulation and reveals the highly nonlinear nature of the ASBM, and (3) a new coupling with transport equations that improves the accuracy of the model. The original and newer variants of the ASBM are then applied in the simulation of separated flows, so as to obtain a comprehensive assessment of their predictive capabilities. This is then followed by a thorough study on the ability of the model to provide well-converged solutions. The IPRM is a stochastic structure-based model of homogeneous turbulence. This thesis documents a new formulation based on an Eulerian reference frame that replaces the original Lagrangian framework and thus avoids the slow convergence and bias of statistical estimators. The derivation of the Eulerian formulation, its solution through radial basis functions, and a comparison against the original solution methods are reported in detail. Taken together, the work performed on both models advances the applicability and understanding of structure-based modeling for turbulent flows.
Description
| Type of resource | text |
|---|---|
| Form | electronic; electronic resource; remote |
| Extent | 1 online resource. |
| Publication date | 2016 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Associated with | Campos, Alejandro | |
|---|---|---|
| Associated with | Stanford University, Department of Aeronautics and Astronautics. | |
| Primary advisor | Iaccarino, Gianluca | |
| Thesis advisor | Iaccarino, Gianluca | |
| Thesis advisor | Alonso, Juan José, 1968- | |
| Thesis advisor | Duraisamy, Karthikeyan | |
| Thesis advisor | Lele, Sanjiva K. (Sanjiva Keshava), 1958- | |
| Advisor | Alonso, Juan José, 1968- | |
| Advisor | Duraisamy, Karthikeyan | |
| Advisor | Lele, Sanjiva K. (Sanjiva Keshava), 1958- |
Subjects
| Genre | Theses |
|---|
Bibliographic information
| Statement of responsibility | Alejandro Campos. |
|---|---|
| Note | Submitted to the Department of Aeronautics and Astronautics. |
| Thesis | Thesis (Ph.D.)--Stanford University, 2016. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2016 by Alejandro Campos
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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