NNW-FSI软件静气动弹性耦合加速策略设计与实现

doi:10.7527/S1000-6893.2021.25738

Abstract

Abstract: A coupling acceleration strategy was designed and implemented in the static aeroelastic module of the fluid-structure interaction software platform, NNW-FSI, with the support of the National Numerical Windtunnel (NNW) Project. The strategy was achieved based on a scheme of deformation increment superposition and used the relaxation factor to adjust the convergence process, inspired by the fact that the static structure deformation of aircraft under aerodynamic loads is independent of the convergence process. Then the parameter influence and acceleration effect of the strategy were tested and evaluated through the static aeroelastic simulation of the ultra-high respect-ratio unmanned aerial vehicle and the CHN-T1 model with different values of the relaxation factor. Finally, the effect of the relaxation factor in three types of static aeroelastic coupling simulation was clarified based on the theoretical analysis of the acceleration mechanism from the perspective of computational error control, and suggestions for the selection of the relaxation factor value were also given. Both the static aeroelastic simulation results and the theoretical analysis demonstrate that an appropriate selection of the relaxation factor value can suppress oscillation and accelerate convergence for a special type of static aeroelastic simulation problem.

Key words: National Numerical Windtunnel (NNW) Project, NNW-FSI, static aeroelasticity, coupling acceleration, relaxation iteration, error control

CLC Number:

V211.3

SUN Yan, WANG Hao, JIANG Meng, YUE Hao, MENG Dehong. Design and implementation of coupling acceleration strategy in static aeroelastic module of NNW-FSI software[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2021, 42(9): 625738-625738.

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Design and implementation of coupling acceleration strategy in static aeroelastic module of NNW-FSI software

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