Hybrid laminar flow optimization design from energy view

For decreasing the drag and lowering the energy consumption for the hybrid laminar flow design correctly, the optimization system, whose object can be set as minimum energy cost, is built by correlating the relationship of suction control power consumption and drag. The optimization system includes the free freedom deformation (FFD) parameterization, the compact radial basis function (RBF) dynamic mesh method, the improved differential evolution (DE), and the high-fidelity Reynolds averaged Navier-Stokes (RANS) solver, which couples with the e^N transition prediction method. For the infinite spanwise wing with 25° sweep angle, there are two optimizations:one is the uniform suction with minimum drag object; one is the distributed suction with minimum energy consumption object. At Reynolds number 10×10⁶, the optimization results with minimum power consumption can obtain the same drag coefficient benefit with 29.1% decrease. The transition location is extended by 18% chord on the upper surface, while 15% chord on the lower surface. The power consumption is reduced by 1.7%. At Reynolds number 20×10⁶, the distributed suction result can get more benefit than the uniform suction. The drag is reduced by 41.3% compared with the original configuration, which is improved by 4.5% compared with uniform suction dirstibution. The transition locations are extended by 52% chord on the upper surface and 14% chord on the lower surface. The suction power consumption is reduced by 8.14%. Thus, the optimization results show that the proposed hybrid laminar flow optimization method from energy view is reliable.