CBL - Campus del Baix Llobregat

Projecte llegit

Títol: Active Flow Control of flow past SD7003 airfoil with Synthetic Jets at Re=60000


Estudiants que han llegit aquest projecte:


Director/a: MELLIBOVSKY ELSTEIN, FERNANDO PABLO

Departament: FIS

Títol: Active Flow Control of flow past SD7003 airfoil with Synthetic Jets at Re=60000

Data inici oferta: 08-02-2022     Data finalització oferta: 08-10-2022



Estudis d'assignació del projecte:
    GR ENG SIST AEROESP
Tipus: Individual
 
Lloc de realització: EETAC
 
Paraules clau:
Active Flow Control, Synthetic Jets, Airfoil, Computational Fluid Dynamics, Turbulence Models, RANS
 
Descripció del contingut i pla d'activitats:
Optimisation of Synthetic Jet (SJ) Fluidic Active Flow Control (AFC) parameters to maximise aerodynamic efficiency or lift and minimise drag of an airfoil is very demanding in terms of computational resources and time. This project aims at using the Reynolds-Averaged Navier-Stokes (RANS) equations to select and tune the most appopriate turbulence model for the accurate prediction of aerodynamic performances of the SD7003 airfoil at angles of attack beyond stall and Re=60000.

The work plan is as follows:

0) Literature review on the SD7003 airfoil and on fluidic actuation with synthetic jets.

1) Test the spalart-allmaras, k-epsilon and k-omega turbulence models for the SD70003 airfoil in stall conditions, and compare against available LES simulation results.

2) Test the turbulent models for the AFC parameters currently believed to perform optimally, and compare against available LES simulation results.

3) Set up a new optimisation based on the best performing turbulence model, both using genetic algorithms (GA) and more classic methods such as Newton or steepes gradient.

4) Design strategies to reduce as much as possible the computational requirements for the optimisation process .
 
Overview (resum en anglès):
Active Flow Control (AFC) can improve markedly the aerodynamic capabilities of airfoils. Focusing on one of its strategies employing Synthetic Jet Actuators (SJA), the present bachelor thesis studied the performance of two synthetic jet configuration implementations via an unsteady Reynolds-Averaged Navier-Stokes (RANS) solver using three different turbulence models. The mesh employed to conduct the different studies consisted of a hybrid C-type grid which was developed via a hand-made python program. The airfoil considered was the Selig-Donovan 7003 (SD7003) in a post-stall angle of attack \(\alpha=14\degree\) at Reynolds number \(Re=6\cdot 10^4\). One of the first findings of the study was that two of the three selected turbulence models, concretely \(realizable-k-\epsilon\) and \(SST-k-\omega\), failed to solve correctly the flow in the post-stall conditions of the baseline case. From that point on, only the Spalart-Allmaras model was used to conduct the following actuated studies. To ensure the veracity of the results obtained from the different baseline and actuated cases, they were compared to the available literature whenever possible. The first study addressed the sensitivity of the Spalart-Allmaras results on the boundary condition value chosen for the turbulent viscosity. Results concluded that a notable influence was present and that the value that produced the most accurate results when compared to LES ones from literature was \(\tilde{\nu}/\nu = 10^{-5}\). Next, a study addressing the performance of a tangential jet implementation for AFC purposes was conducted by testing six different combinations of SJA parameters. From the obtained results was concluded that the non-dimensional frequency \(F^+\) played a vital role in the stability of the velocity field within the boundary layer in this jet configuration. In addition, the study showed promising results as six mere combinations of different SJA parameters were already able of providing outstanding improvements on both the lift and aerodynamic efficiency of the airfoil.


© CBLTIC Campus del Baix Llobregat - UPC