Two-dimensional numerical simulations of the flow around a NACA0012 profile at Reynolds number Re=5000 show that unsteady periodic flows reach different saturated states when increasing or decreasing angle attack between 7∘ and 8∘. Within this range, lift signal shows co-existing period-doubling, as wake undergoes substantial change in character from standard von-Kármán vortex street. Results e...

In this work, the inverse distance weighting (IDW) interpolation is introduced into implicit velocity correction-based immersed boundary method (IBM) for simulation of incompressible flows. original IBM, solid body must be in a uniform mesh region due to use smooth Dirac delta function, which utilized associate Lagrangian points with their surrounding Eulerian and only works meshes. The IDW has...

Abstract In the present study, a nonlinear system identification approach based on long short-term memory (LSTM) neural network is applied for prediction of transonic buffet aerodynamics. The as reduced-order modeling (ROM) technique an efficient computation time-varying integral quantities such aerodynamic force and moment coefficients. Therefore, procedure well generalization ROM are presente...

Immersed boundary methods (IBMs) are an interesting alternative to the usual body-fitted mesh approach when dealing with complex geometries as they allow simpler generation. The volume penalization method (an IBM) is commonly used for incompressible and compressible viscous flows but only one application inviscid can be found, which uses characteristic-based (CBVP) method. This penalizes Euler ...

A numerical approach to predict broadband trailing-edge noise for low Mach number flows is presented. It based on the combination of a Helmholtz solver propagate sound waves with source term computed stochastically. The propagation performed in frequency domain using high-order finite element solver. stochastic random particle-mesh method. performance this first examined Gaussian source. then a...

We present an experimental investigation of the flow structure in near wake a NACA0012 airfoil plunging sinusoidally at chord Reynolds number Re = 20 000 and for wide range reduced frequency k Strouhal based on peak-to-peak amplitude St . Estimated mean thrust coefficients using fluctuating velocity fields confirm 2 dependence as well significant effect ? 1. Generally, time-averaged quantities ...

Trailing-edge noise (TE noise) is an aeroacoustic sound radiated from isolated airfoil in the specific ranges of low-speed flow. We used a pulsed laser as actuator to reduce TE without modifying airfoil’s surface. The wind tunnel test was conducted verify capability Nd:YAG actuator. beam focused into air just outside velocity boundary layer on lower side NACA0012 airfoil. experimental result sh...

Two-dimensional numerical simulations of the flow around a NACA0012 profile at Reynolds number Re=5000 show that unsteady periodic flows reach different saturated states when increasing or decreasing angle attack between 7∘ and 8∘. Within this range, lift signal shows co-existing period-doubling, as wake undergoes substantial change in character from standard von-Kármán vortex street. Results e...

Abstract The aim of this research is to quantify the membrane deformations and their impact on performance for a ribbed wing sail. A 1m x 0.8m rectangular planform NACA0012 foil was designed replicate single section wing-sail. Two foils were manufactured based geometry, one out solid foam using rib structure. These tested in R.J. Mitchell closed return 3.6 m 2.5 wind tunnel at University Southa...