CFD Results for Shock-Boundary Layer Flow Control with Micro-ramps at Various Grid Densities
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Bibliographic record
Abstract
CFD was used to simulate the effect of micro-ramps on a shock-boundary layer interaction. A single ramp geometry and flow condition were simulated with fixed grids of various mesh densities, and also with an adaptive grid which locally refined the mesh to resolve flow features as they developed. Within the grid study was an effort to assess the effect of various techniques for approaching a converged solution. The intent was to determine if the converged solution depended upon the order in which the boundary layer, incident shock, and flow control ramp were introduced into the CFD solution. The Splitflow CFD code was used for the simulations because of its automatic self-generated grids and adaptive capability. Splitflow refines and focuses grid cells near features in the solution and/or geometry, and it also allows the addition of geometry features (e.g., flow control ramp) during the convergence of the solution. The result was that for coarse grids, the separation location and size remained fairly unaffected by the technique used to approach convergence. However, for moderate and fine grids, the location of the separation was strongly influenced by the order in which the incident shock and flow control ramp were introduced. The size of the separation is influenced by the grid resolution surrounding the incident shock as well as the grid surrounding the separation itself. This indicates that the numerical solution is not unique. Experimental test data favored the CFD solution with the separation location downstream and outboard of the ramp (attached flow directly behind the ramp). This corresponded to the CFD results when the incident shock was added to the solution before the ramp was introduced. However, the non-uniqueness of the numerical solution could be indicative of non-uniqueness in the physical solution, depending upon the actual testing conditions. I.
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| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
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