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A first-order time-domain green's function approach to supersonic unsteady flow
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Tseng, K. Freedman, M. I. |
| Copyright Year | 1985 |
| Description | A time-domain Green's Function Method for unsteady supersonic potential flow around complex aircraft configurations is presented. The focus is on the supersonic range wherein the linear potential flow assumption is valid. The Green's function method is employed in order to convert the potential-flow differential equation into an integral one. This integral equation is then discretized, in space through standard finite-element technique, and in time through finite-difference, to yield a linear algebraic system of equations relating the unknown potential to its prescribed co-normalwash (boundary condition) on the surface of the aircraft. The arbitrary complex aircraft configuration is discretized into hyperboloidal (twisted quadrilateral) panels. The potential and co-normalwash are assumed to vary linearly within each panel. Consistent with the spatial linear (first-order) finite-element approximations, the potential and co-normalwash are assumed to vary linearly in time. The long range goal of our research is to develop a comprehensive theory for unsteady supersonic potential aerodynamics which is capable of yielding accurate results even in the low supersonic (i.e., high transonic) range. |
| File Size | 1745123 |
| Page Count | 39 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19850021618 |
| Archival Resource Key | ark:/13960/t53f9n51k |
| Language | English |
| Publisher Date | 1985-04-01 |
| Access Restriction | Open |
| Subject Keyword | Aerodynamics Supersonic Flow Panels Green's Functions Unsteady Flow Potential Flow Finite Element Method Time Dependence Integral Equations Finite Difference Theory Differential Equations Nonlinearity Aircraft Configurations Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
