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# Laminar-Turbulent Transition

Instability mechanisms, such as: Kelvin-Helmholtz, Tollmien-Schlichting, Gortler, and crossflow. Secondary instabilities. Nonlinear and nonparallel effects. The Parabolized Stability Equations. Receptivity. Transition prediction. Effects of compressibility, heating, roughness, turbulence, noise, curvature, etc. Turbulent spots and the extent of transitional flow. SP2018 Syllabus

## AAE62400

3

### Learning Objective:

**IMPORTANT COURSE DETAILS** The majority of the course content will be delivered via asynchronous audio format. Slides available in advance in PDF form. Please contact the instructor for details.

### Description:

Instability mechanisms, such as: Kelvin-Helmholtz, Tollmien-Schlichting, Gortler, and crossflow. Secondary instabilities. Nonlinear and nonparallel effects. The Parabolized Stability Equations. Receptivity. Transition prediction. Effects of compressibility, heating, roughness, turbulence, noise, curvature, etc. Turbulent spots and the extent of transitional flow. SP2018 Syllabus

### Topics Covered:

Introduction: Mechanisms of transition: linear and nonlinear instability, secondary instability, environmental noise, bypasses. Limitations of algebraic correlation schemes. Review of elementary wave theory. Review of the basic concepts of random processes and spectral analysis ;Linear Instabilities; General Parametric Effects; Supersonic and Hypersonic Effects; Advanced Methods for Analysis and 'Prediction' - a) transient growth, b) nonlinear and secondary instabilities, c) beyond local methods; Intermittency and the Extent of Transition; Roughness Effects; Case Studies; Receptivity.

### Prerequisites:

AAE511 or equivalent. Consent of instructor (steves@purdue.edu) required to register - send approval email to ProEd (proed@purdue.edu) for a registration override.

### Applied / Theory:

https://engineering.purdue.edu/AAE624/

### Web Content:

Outline, past project descriptions, references, handouts, etc.

### Homework:

A couple of two-week homeworks and a project.

### Projects:

Yes, details TBA.

None.

### Textbooks:

Official textbook information is now listed in the Schedule of Classes. NOTE: Textbook information is subject to be changed at any time at the discretion of the faculty member. If you have questions or concerns please contact the academic department.
No textbook. A reference list will be handed out, along with selected review articles. To be supplemented by extensive handouts, copies of which are also available as Acrobat PDF files.

### Computer Requirements:

ProEd Minimum Computer Requirements.

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