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Predicting transition from laminar to turbulent flow over a surface
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Copyright Year | 2013 |
| Description | A prediction of whether a point on a computer-generated surface is adjacent to laminar or turbulent flow is made using a transition prediction technique. A plurality of boundary-layer properties at the point are obtained from a steady-state solution of a fluid flow in a region adjacent to the point. A plurality of instability modes are obtained, each defined by one or more mode parameters. A vector of regressor weights is obtained for the known instability growth rates in a training dataset. For each instability mode in the plurality of instability modes, a covariance vector is determined, which is the covariance of a predicted local growth rate with the known instability growth rates. Each covariance vector is used with the vector of regressor weights to determine a predicted local growth rate at the point. Based on the predicted local growth rates, an n-factor envelope at the point is determined. |
| File Size | 3261837 |
| Page Count | 27 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20150003117 |
| Archival Resource Key | ark:/13960/t1rg0r292 |
| Language | English |
| Publisher Date | 2013-09-17 |
| Access Restriction | Open |
| Subject Keyword | Fluid Mechanics And Thermodynamics Patents Turbulent Flow Computational Fluid Dynamics Laminar Flow Control Surfaces Equilibrium Flow Tollmien-schlichting Waves Boundary Layer Transition Computerized Simulation Prediction Analysis Techniques Design Optimization Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Patent |
