Print Email Facebook Twitter Adjoint-based optimization of a source-term representation of vortex generators Title Adjoint-based optimization of a source-term representation of vortex generators Author Florentie, L. (TU Delft Aerodynamics; TU Delft Education and Student Affairs) Hulshoff, S.J. (TU Delft Aerodynamics) van Zuijlen, A.H. (TU Delft Aerodynamics) Date 2017-12-16 Abstract An optimization approach is presented that can be used to find the optimal source term distribution in order to represent a high-fidelity vortex-generator (VG) induced flow field on a coarse mesh. The ap- proach employs the continuous adjoint of the problem, from which an exact sensitivity is calculated and used in combination with a trust-region method to find the source term which minimizes the deviation with respect to the reference velocity field. The algorithm is applied to an incompressible flow over a rectangular VG and VG pair on a flat plate and compared to results obtained with the jBAY-model and a body-fitted mesh simulation. The results indicate that a highly accurate flow, yielding only minimal errors with respect to the shape factor, circulation and vortex core, can be obtained on coarse meshes when adding a source term to only a limited number of cells. This approach therefore demonstrates the potential of source-term models to include the effects of VGs in computations of large-scale geometries. It also allows quantification of the achievable accuracy on a particular mesh and the calculation of the source term which is optimal for a specific situation. Furthermore, the optimization approach can be used to diagnose the deficiencies of an existing source-term VG model, in this work the jBAY model. Subject Continuous adjoint methodSource-term modelVortex generatorsFinite-volume methodComputational Fluid Dynamics (CFD) To reference this document use: http://resolver.tudelft.nl/uuid:1ade02d3-c3a8-4a8a-a850-4cfea9e95c19 DOI https://doi.org/10.1016/j.compfluid.2017.12.009 ISSN 0045-7930 Source Computers & Fluids, 162, 139-151 Part of collection Institutional Repository Document type journal article Rights © 2017 L. Florentie, S.J. Hulshoff, A.H. van Zuijlen Files PDF 1_s2.0_S0045793017304462_main.pdf 2.5 MB Close viewer /islandora/object/uuid:1ade02d3-c3a8-4a8a-a850-4cfea9e95c19/datastream/OBJ/view