Surrogate-based aeroelastic loads prediction in the presence of shock-induced separation |
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Institution: | 1. Department of Mechanical & Aerospace Engineering, University of Strathclyde, Glasgow, G1 1XJ, UK;2. Defence and Security Research Institute, University of Nicosia, Nicosia, Cyprus;3. Air Force Research Laboratory, Wright Patterson AFB, Ohio 45433-7402, USA;4. Senior Researcher at the University of Nicosia Research Foundation, Cyprus |
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Abstract: | A surrogate-based modeling strategy is presented for robust and efficient prediction of unsteady aeroelastic loads in the presence of shock-induced separation. Enriched piston theory predictions are extended with a data-driven nonlinear autoregressive with exogenous inputs model to account for hysteresis from the interplay of a dynamically deforming surface with the separation bubble in a shock/boundary layer interaction. The approach is evaluated for prescribed surface motion and shock-induced panel flutter responses, with good agreement observed in each scenario relative to unsteady Reynolds-averaged Navier–Stokes simulations. For the latter, excellent agreement is observed in the prediction of the stability boundary and oscillation frequency. In contrast, the oscillation amplitude conservatively deviates from the Reynolds-averaged Navier–Stokes solution with increasing dynamic pressure. The online computational cost of the extended approach is orders of magnitude less than that required for predictions using an unsteady Reynolds-averaged Navier–Stokes model. |
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Keywords: | Surrogate models Kriging NARX model Panel flutter Limit cycle oscillation Supersonic Shock impingement Two-dimensional |
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